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Configuring Miniature Conveyor Part Numbers

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The Miniature Conveyor part number begins with the four or five letter Part Type code (example: CVSA). MISUMI offers 10 different types of Miniature Conveyors. The belt width or pitch in a dual track layout is defined in 10mm increments (example: 300) followed by the belt length in 5mm increments (ex: 1000). The motor output in watts is then defined (example: 15). The motor voltage will start with "TA" for a single-phase, international standard motor, or "SA" for a three-phase, international standard motor, followed by the voltage rating (example: TA115). If a variable speed motor and speed controller is required, this is followed by SCM, otherwise a simple induction motor will have the code IM (example: SCM). The gear head ratio follows (example: 11.5). This ratio will determine the speed of the motor and belt. For a variable speed motor, the speed rating will be the maximum, where the speed can be set from 0 up to the maximum. If applicable, the Flat Belt type will be selected last.

12 New Miniature Conveyors

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MISUMI has released 11 new Miniature Conveyors into our conveyor product line, including Stainless Steel Belt conveyors. In addition are sleek, new aluminum frame and cover conveyors, and the new full-width belt conveyors. These additions to the line feature a flat belt that extends to the end of the frame. Another new product is the flat belt conveyor with a distinctive crosspiece groove design to prevent belt wandering. They are available as end-shaft or center-driven conveyors.

 

In addition to new conveyor styles, MISUMI has released new conveyor components. Available now is a stand which includes a crossbar between the two legs for additional support. Also new are round guide rails as an alternative to the L-shaped rails, as well as the brackets necessary for mounting.

New Miniature Conveyors Expand Product Line

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MISUMI now offers 11 different types of conveyors from Flat Belt to Timing Belt styles, Single Track or Dual Track, End Shaft driven to Center Drive to Built-in Drive. They can be configured with widths to 300mm and lengths to 3,000mm. There are 11 different Flat Belts options including General Purpose, Slidng, Inclined Application, Oil-resistant and Electronic Parts Conveyor. International standard Panasonic motors are included. The single-phase induction motors are offered with a voltage of 100, 115, or 100V. Three-phase induction motors are available with a voltage of 100, 110 or 130V. The three-phase induction motors can be upgraded to a single-phase variable speed induction motor, which includes a speed controller.

How do I reduce or eliminate the feedback noise on the AC power line connected to my RSH power line?

(Frequently Asked Questions) Permanent link

 

To eliminate line noise from the RSH controller first check that the controller is connect to a good Earth ground. We also recommend that a noise filter be placed on the incoming AC power line near the C11 or C11 controller.

 

Misumi offers a noise filter that will work to reduce the noise on the AC line for most applications. The Misumi part number for this filter is EXRS-NF1.

 

If this filter doesn’t reduce the noise on the AC line sufficient for your application. We recommend that you add a 0.5 kW to 1 kW line isolation transformer. This transformer is readily available from an electrical supply house.

 

See Tech Notes RS-11-001: How to Reduce AC Power Line Noise from the C11 & C11 Controllers.

 

 

New Additions to Miniature Conveyor Product Line

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The new Miniature Conveyor product line now offers a brand new compact design with built-in drive and dual track plastic chain. With the six newly added flat belts, there are a total of eight different belt types, including food grades, static conductive, oil-resistant or low friction for accumulating conveyance. Also available are accessories and additional options like quick adjust brackets, guide rails, transfer bar nows, reversed motor position or stands.

Metric or Inch Bore Holes for Timing Pulleys under one Configurator

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Most of our Timing Pulleys are now available with inch bore holes. Included are pulley types MXL, XL, L, H, S1M, S3M, S5M, S8M, T5, T10, AT5, and AT10. These new inch bores can be found on the same pages as the metric bore parts. Simply select "Inch Bore" from the drop down menu at the top of the CAD Configurator to configure a pulley with an Inch Bore.

Timing Pulleys with Inch-bores and ANSI Keyways

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MISUMI now offers inch-size bore holes and ANSI keyways for many of our metric catalog timing pulleys. Included are MXL, XL, L and H types, as well as S1M, S3M, S5M, S8M, T and AT types.

 

When choosing an inch size, simply select the bore spec (HU for inch round hole, PU for inch round hole + tap, or NU for inch ANSI key groove hole + tap) and follow it with the inch hole spec (A through S = 1/8" through 1").

 

For example, in the part #ATP11XL037-B-NUF,  "NUF" specifies an inch ANSI key groove + tap with a 1/1" bore. Note that the set screws are still metric. Remember to check the catalog page to determine size availability.

 

 ShaftBore-specs

Selectable and Customizable Washers, Spacers and Collars

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MISUMI is now offering the largest variety of precision washers, spacers and collars to date. This unprecedented variety in materials and surface treatments is leading to alternative and interchangeable usages. You can choose from 9 different metals and 4 different surface treatments. 10 different resin materials are available as well.

 

Precision washers are surface finished up to an Ra of 1.6µ, offering an extremely smooth surface and high precision thickness. Tight machining tolerances combined with a wide range of thicknesses and lengths allow engineers to use washers as spacers and spacers as collars.

 

In addition, our collars have new alterations available for increased configurability. Inner and outer diameter tolerances can be improved up to H7. Chamfering and tapering can be cut at 15, 10,30, 45 and 60 degree angles. Set screw holes can be added at specific positions. Inner diameter coarse and fine tapping are new options. A lengthwise slit can be applied for tough fitting situations.

Guide mechanism design options on XYZ positioning stages

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MISUMI XYZ positioning stages are offered with different guide mechanisms:

 

DOVETAIL

Stage motion is achieved by sliding male and female trapezoidal grooves. Straightness of dovetail mechanism is 30µ for high precision stages and 50µ for standard positioning stages.

XYZ-dovetail

 

CROSS ROLLER

Caged cylindrical rollers are placed between two V-groove rails. Rolling motion of rollers allow for very smooth and accurate motion. Straightness of units using cross roller guides are 3µ for high precision stages and 30µ for standard positioning stages. 

XYZ-crossroller 

 

LINEAR BALLS

Caged steel balls roll between two (gothic) arch grooves. Grooves are machined on the body of the stage itself. This allows for more compact (low) stage profile. At the same time, steel balls have 4-point contact with raceway (grooves), resulting in a more rigid structure. Load capacity is higher than with cross roller stages. Straightness accuracy of these units is 1µm.

XYZ-LinearBalls

 

Misumi Technical Tutorial

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Our Technical Tutorial is one year old today. If you had no chance to visit this section yet, you will find it very useful in four different areas:

- Surface Refinishing (where different surface treatment techniques are explained)

- Low Cost Automation (the mechanical tutorial you will probably find most useful)

- Press Dies (this tutorial explains practical aspects of design in Press Technology)

- Plastic Molding (easy to understand mold design tutorial)

 

Altogether, we released 180 short articles since June 13, 2009.

Please follow this link: http://www.misumi-techcentral.com/tt/en/

Did you know?

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There is a button called "My Components List" just below the configurator. It lets you memorize the exact configuration you selected, so if you need to re-download the same part, or slightly modify your last selection, you can just go to my page at the top of the page and click on the part number in "My Components List". It will take you to the exact configuration you saved.

Angular Contact Ball Bearings Combinations--DB and DF

(General) Permanent link

In regards to the back-to-back arrangement or "DB", axial loads in both directions and radial loads can be sustained. Due to the large distance between the effective load centers, this type is suitable when moments are applied but can not withstand larger rotational misalignments.

 

Angular contact ball bearings can also be arranged in a face-to-face arrangement or "DF". When compared to the "DB" arrangement, the distance between the effective load centers is small, so sustainable moment capacity is lower than the "DB" combination. On the other hand, this combination can handle more rotational misalignment and is used with housings that have less accuracy.

 

 Angular Contact Ball Bearings

PEEK Material Availability in the USA

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Since year 2010, MISUMI offers products made of PEEK material for North American customers. PEEK is an engineering thermoplastic with excellent temperature resistance suitable for continuous use above 500 degrees F (160 degrees C) with excellent flexural and tensile properties at very high temperatures.

NEMA Adapter Plates for LX Actuators

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Some of the MISUMI adapter plates that match NEMA standards:

LX10

E1040 and A1040 match NEMA16

T1041 matches NEMA17

LX16

E1640 and A1640 match NEMA16

T1641 matches NEMA17

LX30

E3040 matches NEMA16

T3041 matches NEMA17

T3056.4 matches NEMA13

LX45

E4540 and A4540 match NEMA16

 

We are looking into adding other NEMA options in the future.

Material and Surface Finish Conversion List - supplement to 08-09 Catalogs

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Misumi USA catalogs contain reference information on surface treatment, hardening, and how JIS materials compare to other standards in our "Technical Data" sections. For your convenience, a supplemental reference list of material and surface finish conversions pertaining to the 2008-09 Misumi USA catalogs is now available. The intent is to present you a handy comparison. Please download our conversion (pdf) list.

 Material and Surface Finish Conversion List for 08-09 Misumi USA catalogs 

Thread galling on SS and Self-generating Oxide Surface Fasteners

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Thread galling, sometimes known as cold-welding, is a common problem with fasteners made of stainless steel (SS), aluminum, titanium, and other alloys which self-generate oxide film for corrosion protection. Galling can occur when the surfaces of male and female threads are installed under heavy pressure, which may cause protective oxide to break and increase friction between nut and bolt that generates enough heat to fuse them together.

 

During minor galling, the fastener can still be removed, but in severe cases  of galling, a strong bond between the bolt and nut can prevent removal of fastners. Unfortunately, little is known on how to control it, but there are a few ways to minimize this effect:

- Decreasing installation RPM speed will cause less friction and decrease heat generation.

- Lubrication used prior to assembly can reduce or eliminate galling. Recommended lubricants should contain higher amounts of molybdenum disulfide, such as graphite which is very commonly used as a solid lubricant or special anti-galling lubricants sold by chemical companies.

- Using varying grades of SS will also reduce galling due to differing hardness.

- Smoother surface roughness will also reduce galling. Polishing them before installation will help, especially with nuts because these threads are always cut so that they have a rougher finish.

Couplings, part 2

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Couplings can tolerate misalignment while transmitting torque. Using couplings over their allowable misalignment values can cause vibration, shorten their life span, and even cause a complete failure.

 

Types of misalignments:

 

DECLINATION - Flexibility in angular direction between two connected shafts.

 Coupling-Pt1-Declination

 

ECCENTRICITY - Flexibility in lateral direction between two connected shafts.

Coupling-Pt1-Eccentricity

 

END PLAY - Flexibility in axial direction.

Coupling-Pt1-EndPlay

 

 

The allowable misalignment values stated in the catalog assume that only eccentricity, declination or end play occurs alone. In case of two or more misalignments occurring at the same time, allowable range as stated in our catalog is reduced by 50%. To prolong coupling life, it is recommended to keep misalignment within 1/3 of the stated catalog values.

 

 

Couplings, part 1

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Couplings come with different torque rigidity and can tolerate different levels of misalignment. MISUMI offers four basic groups of couplings depending upon their structure.

 

1. DISC COUPLINGS

Can withstand high torque and are best suited for servo motor applications. Due to very low backlash, these couplings are suitable for application where high positioning precision is required. Coupling structure allows for misalignment by disk deflection.

 

Couplings Disk type Part1

 

1. OLDHAM COUPLINGS

Compared to other couplings, Oldham couplings have a wider range of allowable declination and eccentricity. By changing the spacer from resin to aluminum bronze, couplings can achieve approximately 1 times higher torque. Oldham couplings are very easy to install. Coupling structure allows misalignment by spacer deflection and sliding.

 

Couplings Oldham type Part1

 

3. SLIT COUPLINGS

These couplings have very low backlash and are suitable where precision positioning is required. Although slit couplings have a single structure, they can tolerate shaft misalignments.

 

Couplings Slit type Part1

 

 

 

4. OTHERS

The last group covers a variety of couplings like rigid and bellows coupling. These couplings are unique in their features. Rigid couplings have a very low backlash and excellent rigidity, but they do not allow for any misalignment. On the other hand, bellow couplings have low rigidity, but can handle large shaft misalignment.

 

Couplings-Other Part1

Stainless Steel Push Pull type Toggle Clamps

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For our stainless steel (SST) Push Pull type Toggle Clamps made of non-magnetic 304SSt, Push Pull Pin is made of martensitic 431SST that combines excellent impact strength at a high hardness level with the best corrosion resistance of any martensitic stainless steels, but also has magnetic properties. MISUMI uses a hardened type of SST for Push Pull Pins to enhance their life span.

CAM Followers with Grease Nipple Option

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Cam followers with tapped hole for grease lubrication are an addition to our existing product line. Both crown and flat cam followers are equipped with tapped holes on head and stud (threaded) end.

 

Cam follower with Grease Nipple diagram

 

A grease nipple is not automatically included with a cam follower unless this alteration is specified. Users can specify different styles of grease nipples. This allows for easy maintenance and user can avoid any interference in design phase.

 

CAM follower with Grease Nipple graph

 

For more information on cam followers, tapped for grease nipple, please follow this link:
http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301015040.html

 

Self-Aligning Ball Bearings

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Double row self-aligning ball bearings have a spherical raceway inside the outer ring and a double raceway on the outside of the inner ring. The steel balls, cage and inner ring can rotate freely at the certain angle allowing for self-aligning properties. Angular misalignment between shaft relative to bearing housing is suitable for applications where considerable shaft deflections or misalignments are expected.

 

Allowable misalignment angle is approximately 0.07 - 0.11 radian (4-7 degrees) at normal load condition, however, this degree of allowable misalignment may be limited by structure around the bearing, which may cause contact with the bearing under misalignment.

 

Double row self-aligning ball bearings are mainly used to carry radial loads and light axial loads, and are not suitable for application with heavy axial loads or pure axial loads.

 

For bearing specifications, please refer to this link: http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301014510.html 

 

SelfAligning Ball Bearings

Standard Radial Ball Bearings Fits with Shaft

(Geometric Tolerances and Fits) Permanent link

 Radial Ball Bearings Fits with Shaft

Standard Radial Ball Bearings Fits with Housing

(Geometric Tolerances and Fits) Permanent link

 Radial Ball Bearings Fits with Housing

New Economical Rotary Shafts

(Product Selection) Permanent link

Misumi has added new Cold Drawn Rotary Shafts with h9 OD tolerance.  These new shafts are ideal for less demanding applications (for example conveying systems) and the manufacturing process of these shafts greatly reduces the price.  

 

 

These shafts have 6.3µm surface roughness without specific circularity and straightness.  If the shafts have additional steeps (for bearings etc…) they will remain with either g6 or h7 tolerance based on selection.

 

New, Usefull Website Feature

(General) Permanent link

Our newly released Website offers a new tool that you will find very useful.

After you configure the part using the online configurator, you will find a button called "My Component List". Once you press it, a new window will open and you will be able to add this configuration to Your list. When you later go to "My Page" in the upper right hand corner of the Misumi site, you will find the added part under "My component list". Once you click on the desired component you will be taken not only to the correct configurator, but also the values you selected will already be chosen for you from system's memory.

This may help you if you are working with several parts in the same group or if you need to make slight modifications to your configuration.

Please, remember that you have to be logged in to use this feature.

Search By Application

(General) Permanent link

Unfortunately, as we all know, there is no universal naming convention in the Assembly Automation Industry.  For example, what some people call Clevis Pins, Misumi calls Precision Pivot Pins.  As a result, if someone were to perform a keyword search of Clevis Pin on our website, no parts would be returned.  Even worse, you may have a part in mind that literally doesn't have a name (so there is nothing to type in the "Search by Keyword" box on our website). 

In situations like this, look on the Misumi e-Commerce Homepage, there are listed 11 major product categories; Linear Components, Rotary Components, Transmission Components, Locating Components, Inspection Components, Industrial Materials, Hardware, Springs/Shock Absorbers, Hydraulic/Pneumatic Components, Temperature Controller components and Structural Components.  You can find the part you are looking for by selecting the tab under which your specific component was listed.

Login Errors

(General, Frequently Asked Questions) Permanent link

"You are already logged in with this ID. To continue, re-type your password.  If someone else is currently logged in using your ID, that person will be forced to log out" when you try to log into our site. 

If so, there is a very easy solution.  Before I get into the solution, let me explain exactly why this happens.  When you log into our website, two things happen.  First, a unique key is generated and stored as a cookie on your computer.  Second, the database that runs the website records that you are "logged in".  Now, if you lose that cookie that has your unique key in it (for example, by closing your web browser) without explicitly logging out of our website, then the next time you try to log in, the website will see that, according to our database online, you are still logged in.  But, since your computer does not have the login cookie, it assumes that someone else it trying to log in as you.  That is why you receive that error message. 

Now, the good news is that it is very easy to fix this situation.  Once that error message appears, simply enter your username and password again, and you will be able to log in as normal.

Problems Registering

(General, Frequently Asked Questions) Permanent link

Have you tried registering with our website, but can't log in? 

Well, the problem may be that you failed to receive our verification email. 

Registering with Misumi is a two step process.  First, there is the online registration that must be filled out.  Once that is filled out, that triggers the second stage.  The second stage is an email that is automatically sent to the address you previously entered.  Contained inside this email is an activation link.  This activation link is only valid for 14 hours.  If you click on this link within 14 hours, it will activate your account.  It is only then (after your account become active) that you will be able to log in. 

Now, if you never received an email from Misumi after the first part of the registration, it is most likely due to a spam filter.  Don't worry, you can still register, but you will need to contact Misumi Customer Service in order to activate your account.

Schematic View

(Product Selection) Permanent link

When selecting the "Precision Linear Shaft" or "Rotary Shaft" product groups (on the left hand side of the website), do you have trouble determining the differences in shape between the parts?  If so, then click on the "Schematics" tab located in the upper right hand corner of the screen.  This will switch the images shown from photos to schematics.  This will make it easier to see the differences between the parts.

Stopper Bolts

(Product Selection) Permanent link

Looking for a physical stop, but don't want to take up a lot of room?  Have a look at our Stopper Bolts with Bumpers (US Metric 09 page 961, or search online for part type: UST).  These are standard hex head cap screws, but they have a urethane, polyacetal, or silicon bumper baked onto the head.

New RS/RSH Single Axis Robots

(Product Selection) Permanent link

Misumi now offers two different types of single axis robots called RS and RSH.

Both RS and RSH come with the motor and controller.

The programing software is very easy and fast.

Load capacity is 11kg(Horizontal)、〜4kg(Vertical) for RS style units

and 80kg(Horizontal)、〜16kg(Vertical) for RSH style units.

The stroke is configurable for both styles and can be as large as 800mm for RS and 1050mm for RSH.

Max. Speed is up to 1000mm/s for RS and 1800mm/s for RSH

Please, follow this link to find out more information:

http://www.misumi-ec.com/eusaen/mech/product/rs/ 

New Single Axis Actuator Catalog can be ordered here:

http://apps.misumiusa.com/wos/catalogs/ActuatorCatalog2009.aspx 

 

RS Robot Single Axis Actuator Contents

(Frequently Asked Questions) Permanent link

We have been asked by several customers what is contained in the RS unit package.

The RS units contain the following:

  • The actuator with integrated ballscrew, motor and Magnetic encoder
  • Controller
  • Cable connecting the unit to the Controller
  • Instruction manuals for The robot and the controller (on CD)

The PC based RS Controller software is not part of the package and can be purchased separately along with a special USB cable connecting the Controller to a PC.

Other optional components that can be purchased are:

  • Handy terminal in two different versions,
  • I/O cable
  • Noise Filter
  • Set of printed manuals.

Linear Guides Lubrication

(Frequently Asked Questions) Permanent link

To extend linear guides life, it is highly recommended to reapply grease to them periodically unless the application requirements prohibit any kinds of lubricants. Lubricant prevents against metal to metal contact and also minimizes retainer wear by reducing friction. Grease should be periodically reapplied depending on the operating conditions.

Misumi recommends lubrication intervals every 100km of travel or 6 months which ever comes first for normal conditions and every 3 months under severe conditions (high speed, high load etc…). 

What if customer needs to have “Light-Press Fit” or “Press Fit” between shafts and ball bearings?

(Frequently Asked Questions) Permanent link

In case you need to have either “Light-Press Fit” or “Press Fit” between shafts and Ball Bearings instead standard “Sliding Fit” that Misumi shafts with g6 tolerance produce with ball bearings combination, please refer to new addition “Drive Shafts” and alterations either PJ or DJ (js6 tolerance for “Light-Press Fit”) or PK or DK (k6 tolerance for “Press Fit”).  

http://www.misumi-ec.com/eusaen/pdf/fa/p0639.pdf 

http://www.misumi-ec.com/eusaen/pdf/fa/p0641.pdf 

http://www.misumi-ec.com/eusaen/pdf/fa/p0643.pdf 

http://www.misumi-ec.com/eusaen/pdf/fa/p0645.pdf 

What if customer needs to have three key grooves on rotary shafts positioned from one end?

(Frequently Asked Questions) Permanent link

If you are looking for rotary shafts with three key grooves positioned from on end (It is also available when compining alterations KC & WKC but two grooves are positioned from one end and one groove is positioned from the opposite end which in some cases can be crucial) refer to new styles added to our website: Click Here 

NAAMS Style Locating Pins

(Product Selection) Permanent link

MAAMS Type Pins 

 

Many of our customers have asked us if we could offer NAAMS style locating pins with Misumi's configurability.

Misumi first developed bullet nose type pins that were similar to NAAMS products, but with some differences. Please see both links:

Flanged style pin: http://www.misumi-ec.com/usa/eusaen/ItemDetail/10300607970.html 

Large Head Pin: http://www.misumi-ec.com/usa/eusaen/ItemDetail/10300608060.html 

Recently, we developed several styles of pins that almost exactly match NAAMS style pins, but the head diameter and length are configurable.

We offer two styles of retaining block style pins:

Flanged Retaining Block Pin- Bullet Nose Type

http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301186110.html 

Large Head Retaining Block Pin- Bullet Nose Type

http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301186310.html 

Another style of pins will work with standard NAAMS style cylinders:

Small Head Cylinder Pin - Bullet Nose Type

http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301186560.html 

Large Head Cylinder Pin - Bullet Nose Type

http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301186470.html 

The maximum working head lengths of these pins are up to 30mm, but some of the NAAMS pins are much longer. Our customers suggested we develop pin holders instead. The holders will allow quick change over and at the same time will prevent the pins from breaking.

Here are two pin holders:

Retaining Block Pin Holder

http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301186130.html 

Cylinder Pin Holder

http://www.misumi-ec.com/usa/eusaen/ItemDetail/10301186650.html 

Here is a quick reference page that shows all styles of new pins:

http://www.misumi-ec.com/usa/eusaen/ItemSearchView.html?isMissing=&noCheckMode=0&webSearchMode=0&partNumber=is-&keywordSearchMode=1&keyword=is-

Each of the links will show you an application example and explain how the pins are typically used.

Curved Aluminum Extrusions

(Product Selection) Permanent link

One problem with having a catalog that contains thousands of parts is getting familiar with all of the different parts that are available. 

For example, one interesting part that Misumi offers are Curved Aluminum Extrusions located on page 1113 of the Metric 09 catalog (http://www.misumiusa.com/PDFViewer.aspx?Metric=true2009&Page=1113).  There are several different extrusion sizes and radii available (on top of the standard 1mm increment selection in length). 

Also, Misumi sells the matching acrylic panels that fit inside of these panels.  (Picture1, Picture1, Picture3, Picture4, Picture5)

Blog - Aluminum 1 Blog - Aluminum 1 

Blog - Aluminum 3Blog - Aluminum 4 Blog - Aluminum 5 

Ball Screw Lubrication

(Frequently Asked Questions) Permanent link

To extend a Ball Screw's life, it is highly recommended that you reapply grease to them periodically unless the application requirements prohibit any kind of lubricants.  Lubricant reduces metal to metal contact and also minimizes retainer wear by lowering friction.  Grease should be periodically reapplied, depending on the operating conditions.

Misumi recommends lubrication intervals of every 6 months for normal conditions and every 3 months under severe conditions (high speed, high load etc…). 

Our ball screws are packed with lithium based soap grease, the Misumi grease part number is: GAV1.  For special greases go to our blog titled: “Greases for special environments”.

PROOF LOAD & TIGHTENING TORQUE FOR FINE U NUTS

(Product Selection) Permanent link

 

U NUT TORQUE CHART-SMALL 

https://www.misumiusa.com/PDFViewer.aspx?Metric=true2009&Page=766 

 

INTERNET EXPLORER 7 SECURITY SETTINGS

(Frequently Asked Questions) Permanent link

The Misumi Website was designed to run on Internet Explorer 6.  When Internet Explorer 7 came out, Microsoft changed one of the default security settings.  Unfortunately, the function of the Misumi website (specifically, the pricing frame located below the part configurator) depends on the origonal (IE 6) default security setting, and not the new (IE 7) setting.  Fortunately, it is not difficult to change.

1.  In Internet Explorer, select Tools - Internet Options

1.  Click on the Security Tab

3.  Click on the Custom Level… button

4.  Type "n" on your keyboard (this will select then "Navigate sub-frames across different domains" option

5.  Change the selection from Disabled to either Enabled or Prompt

Once completed, the web page should function normally.

SHAFT COLLAR THRUST LOAD(2)

(Product Selection) Permanent link

Besides the various styles and material selection for shaft collars,
Misumi’s catalog also offers information on maximum thrust load provided by shaft collar.

 

Shaft Collar Thrust Load  

 

For more information on test condition and complete table for thrust
load see page number110 of 2009 Misumi metric catalog

https://www.misumiusa.com/PDFViewer.aspx?Metric=true2009&Page=110

 

 

POSTS WITH SCALE

(Product Selection) Permanent link

A new product addition in our 2009 metric catalog for Assembly Automation are Posts with scale.  The main feature of Posts with scale is the ease of adjustment and quick repositioning for changeover.

Post with Scale 

These Posts are made of 304 Stainless Steel with laser marked scales. The post diameter can be selected between 10, 11, 15, 10 and 15mm while the overall length ranges from 100mm to 300mm, with 50mm increments.  We ship this part in 3 days with a starting price of $14.10 (GSSTN10-100).

For detailed information please check our catalog page
https://www.misumiusa.com/PDFViewer.aspx?Metric=true2009&Page=1119.

 

 

HOW TO DETERMAINE ACTUAL RADIAL LOAD USING BASIC LOAD RATING SPECIFIED IN OUR CATALOG FOR DEEP GROOVE BALL BEARINGS

(Calculations) Permanent link

Basic Load Rating in our catalog for each bearing is NOT the actual load that our bearings can withstand. Below is an example of how Basic Load Rating converts to actual load.

 

Light Load- Up to 0.075C (up to 7.5%)

Medium Load- from 0.075C to 0.15C (between 7.5% and 15%)

Heavy Load- Over 0.15C (Over 15%)

 

C- Basic Load Rating

Cr- Dynamic Load Rating

Cor- Static Load Rating 

 

Example: Bearing B6004ZZ (Cr= 9.4KN, Cor=5.05KN)

Actual Radial Load in Motion (Dynamic):

Light Load < 9.4*0.075< 0.705KN< 705N< 71.9kgf< 158.5lbf

Medium Load= 9.4*0.075~9.4*0.15= 0.705KN~1.41KN= 705N~1410N= 71.9kgf~143.8kgf= 158.5lbf~317lbf

High Load > 9.4*0.15> 1.41KN> 1410N> 143.8kgf> 317lbf

 

Conclusion:

We can see from above calculations that an actual radial load above 317lbf for B6004ZZ bearing is to  operate at a high load. The Misumi blog “Ball Bearing Life and Rated Load” will also help determine bearing life span knowing actual radial and axial load.

 

LOCATING STEP FOR LINEAR GUIDES

(Frequently Asked Questions) Permanent link

Several customers have asked, "What would I safely size a locating step for a Misumi linear guide rail?"  We do not specify the chamfer size on most of our linear guide rails and it's not easy to determine the maximum radius on the step.  If you look at our height adjust blocks (GETA for miniature guides and BETA for standard guides), you will see the reference step feature for each size of the corresponding linear guide. You will also find step height and maximum radius for this product. It is safe to use the same dimensions for your locating step feature. The spacer height is configurable in 1mm increments. Many of our linear guides are now offered with mounting dowel holes on either the rail or blocks or both, which will allow you to get by without the locating steps altogether.

To find the actual chamfer size of a linear guide rail, please see our Global Voice article below:  Explanation of Linear Guides The Design of the Slide Guide Mounting Face. 

PRINCIPAL INFROMATION ABOUT COMMON SURFACE COATINGS USED BY MISUMI

(Materials, Surface Treatments and Hardness) Permanent link
  • Black Oxide - A uniform, mostly decorative black coating for ferrous metals and offers very limited corrosion protection. Used also to decrease light reflection.
  • Electroless Nickel Plating - Is typically used as a coating to provide a hard-ductile, wear-resistant and corrosion-resistant surface for operation in service up to 1000ºF (~538°C). Low coefficient of friction.
  • Hard Chrome Plating - Has excellent abrasion and wear resistance with HV750~ hardness rating.  In addition chrome has a low coefficient of friction and is resistant to heat (melting point 1900ºC (3451 ºF)).
  • Low Temperature Black Chrome Plating - you can find details about this coating in previous blog posted on 5-11-2008.
  • Chromates - The coatings formed from solutions containing both hexavalent and trivalent chromium provide maximum protection by creating mechanical barrier against corrosion.  The degree of corrosion protection is proportional to film thickness.  Chromate coatings are available in wide range of colors. The actual color depends on the type of chromating solution and thickness. Chromate coatings are used over zinc and cadmium coatings to simulate appearance of bright nickel and chromium. Misumi offers Bright Chromate and Trivalent Chromium (Trivalent Chromium is RoHS compliant).
  • Titanium Carbonitride (TiCN) Ceramic Coating - Coating based on PVD (physical vapor deposition) method.  Normally used for cutting tools, hardness of 3000HV and very high wear-resistant.
  • Dicoat - Based on TD (thermoreactive diffusion) method. Hardness of 3100~3800HV, very high wear-resistant. Developed and Patented by Toyota.
  • Anodizing - Oxidation of the surface producing a greatly thickened, hard film of aluminum oxide.  The anodic coatings are used primarily for corrosion protection and abrasion resistance.  The film can be colored by impregnation with dyes or pigments. Misumi uses clear and black anodize for their components.  For aluminum alloy products we also offer Alumite coating which is very similar to anodizing and also offer Hard Alumite Coating (Timing Pulleys) which is very similar to Hard Anodizing.  Alumite and Hard Alumite are done according to JIS standard and some properties of oxide film may slightly differ from Anodizing.

EXTRUDED HOLLOW LINEAR SHAFTS

(Product Selection) Permanent link

Hollow linear shafts are designed to decrease the weight of the shaft, or  by adding pipe threads to each end, in order to allow liquid or air to pass through (in some cases the liquid may assist in cooling the shaft) as well as to run electrical wiring.  When specifying a hollow shaft; REMEMBER the extruded hole's location (concentricity) and tolerances are not very accurate due to the fact that the hollow shaft is extruded and not machined.  Please see the hollow shaft location accuracy chart.

 

Hollow Shaft 1 

Parts that no longer exist in 2009 Metric Catalog

(Frequently Asked Questions) Permanent link

Some of our customers have asked us about parts that exsisted in the 2008 Metric catalog that are no longer available in 2009. Generally, those are the parts that were recently introduced, but had not been very popular. Usually these components are still available until end of March of the following year. Our 09 catalog was released at the end of 2008, so those parts should be available until end of March 2009. In some cases the parts may still be sold for several years after they have been removed from the catalog. To find out if a part is still available, send the part number to our customer service and they will check verify if the part can be obtained.

You can reach customer service by calling Misumi at (800)-681-7475, Fax us at (800)-681-7401 or email us at Inquire@misumiusa.com To view a list of Discontinued Parts, CLICK HERE. 

LINEAR BALL BUSHING LUBRICATION

(Frequently Asked Questions) Permanent link

To extend linear ball bushing life, it is highly recommended to reapply grease or oil to them periodically unless the application reqirements prohibits all kinds of lubricants.  Lubricant prevents metal to metal contact and also minimizes retainer wear by reducing friction.  Oils are used where low friction is a primary requirement.

Grease or oil should be applied to the internal compartment of the Linear ball bushings.  The grease or oil should be periodically reapplied depending on the operating conditions.  Reapplication may be done by adding the grease directly to the internal compartment (Using grease fitting in housing if existing) or by greasing or oiling the shaft .  A Six month lubrication interval should be sufficient for most normal operationing conditions.  If the linear ball bushings works under severe conditions (high speed, high load, high reciprocating motion etc…) a three month lubrication interval is recomended.

For applications with limited access to linear ball bushings or for re-lubrication or no downtime, Misumi offers linear ball bushings with a lubrication unit MX equipped with solid lubricant which requires limited or no maitanance.

SPECIAL NOTE: Linear ball bushings shown in our 2009 catalog from page 155~175 do not come with grease already applied but only with the antirust oil. It is recommended to apply grease before using the bushings and re-apply grease accordingly.  Only bushing with special lubrication unit MX and bushings order with special environment grease have grease applied before they are shipped.

Information on how to apply and re-apply grease is outlined above. 

https://www.misumi-ec.com/eusaen/pdf/fa/PDFViewer.html?catalog=metric&page=149
https://www.misumi-ec.com/eusaen/pdf/fa/PDFViewer.html?catalog=metric&page=151

Ball Bearing Life and Rated Load

 Permanent link

Most popular types of ball bearings are single-row radial also known as “deep-groove” and single-row angular contact bearing.

Both bearings are capable of taking combined radial and thrust loads, but radial bearing is not intended for pure thrust load, while for angular bearing thrust component can be large.

The performance of ball bearings is the function of many variables like bearing material, characteristic of application... To estimate the suitability of a particular bearing two factors are taken into consideration:

- bearing fatigue life

- ability to withstand static load.

 

For bearing fatigue life we can use ball bearing Rated life (L10).

Bearing rated life is measured in millions of revolution that 90% of apparently identical bearings under same operating conditions will complete or surpass. Rated life can be calculated as

 

L10=(Cor/Por)3

 

where Cor-basic dynamic load ratings (N), listed in the bearing table for each individual bearing

Por-equivalent dynamic radial load (N)

 

Por = X*Fr + Y*Fa

 

where  Fr - applied radial load (N)

Fa - applied axial load (N)

X - radial load factor given in table 1.

Y - axial load factor given in table 1.

 

Table11.

Contact
Angle ά

Fa/Co

e

Fa/Fr ≤ e

Fa/Fr > e

      X      Y       X      Y

   0.014     0.19       1       0      0.56     1.30
   0.018     0.11     1.99
   0.056     0.16     1.71
   0.084     0.18     1.56
   0.11     0.3     1.45
   0.17     0.34     1.31
   0.18     0.38     1.15
   0.41     0.41     1.04
   0.56      0.44     1
       30°      …     0.80       1       0      0.39     0.76

 

Size of static equivalent load Po (N) under combine thrust and radial loads is

 

Po = Xo* Fr + Yo* Fa

or

Po = Fr 

which ever is greater.

 

where  Fr - applied radial load (N)

Fa - applied axial load (N)

Xo - radial load factor given in table 1.

Yo - axial load factor given in table 1.

 

Table11.

Contact Angle ά

Xo

Yo

0.6

0.5

30°

0.5

 0.33

 

1-(16th Edition Machinery’s Handbook; Eric Oberg, Franklin D. Jones, Holbrook l. Horton, and Henry H. Ryffell; 1000 Industrial Press INC, New York)

 

Generally the permitted static equivalent load is limited by the basic static load (Cor) rating listed in the bearing table for each individual bearing

 

*Note that calculated values are for ideal operating conditions and that no correction factors (material, operating conditions) apply. Use good engineering practice when calculating bearing life for particular application.

Radial and load factors may slightly very depending on bearing manufacturers.

For Deep grove ball bearings use contact angle 0°.

For Misumi angular bearings use contact angle 30°.

Characteristics of TPE (Thermoplastic Elastomer)

(Materials, Surface Treatments and Hardness) Permanent link

One of the new materials added to the 2009 catalog is Thermoplastic Elastomer (TPE)

Characteristics of TPE include:

(1)Low-dust generating: Superior in abrasion resistance and releases less outgas. Recommended for use in clean rooms.

(1)Ozone resistant: Recommended for use near ionizers, where ozone is often generated.

(3)Low density: With density at 30% - half that of general rubbers, TPE can contribute to weight saving.

TPO, olefi nic thermoplastic elastomer, is superior in heat and chemical resistance among various TPEs.

In addition, TPE is more eco-friendly than general rubbers as it is recyclable.

 TPE (Thermoplastic Elastomer)

Find full specs in the 2009 Metric catalog

https://www.misumiusa.com/PDFViewer.aspx?Metric=true2009&Page=1485 

New Product - Bullet Nose Locating Pin are now available

(Product Selection) Permanent link

Many of our customers have inquired about NAAMS style bullet nose locating pins.  MiSUMi is pleased to announce that we now offer this style of locating pin. 

Bullet Nose Locating Pins 

The pins are slightly different from standard NAAMS pins.  For example the flange thickness is 3mm for all sizes, but both Flanged and "No Shoulder" type pins offer a very important feature- you can configure the head diameter (0.1mm increments) and head length  (1mm increments) as well as the shank length (1mm increments).

Please, follow this link to see the new catalog page:

https://www.misumiusa.com/PDFViewer.aspx?Metric=true2009&Page=917 

Metric System to US Units Conversions

(Calculations) Permanent link

Simplified unit conversion table from Metric system (SI) to US unit system.

 

Physical Quantity 

Metric System (SI) 

US System 

Specific Misumi
Products

Distance

1 [mm]
1 [cm]
1 [m]

0.03937 [in]
0.3937 [in]
39.37 [in]

General

Temperature
[°F]= [°C]*9/5 +31

30 [°C]

86 [°F]

General

Mass (Weight)

1 [kg]

1.1046 [lb]

General

Area

1 [m1]
1 [mm1]

10.76391 [ft1] = 1550 [in1]
0.00155 [in1]

General

Volume

1 [m³]
1 [cm³]

164.1711 [gal] = 35.315 [ft³]
0.0338 [oz]    

General

Force

1 [N]
1 [KN]
1 [kgf]

0.11481 [lbf]
114.81 [lbf]
1.1046 [lbf]

General

Moment (Torque)

1 [Nm]
1 [Ncm]
1 [kgf*cm]

0.73756 [lbf*ft]
0.0073756 [lbf*ft] = 0.08851 [lbf*in]
0.07133 [lbf*ft] = 0.868 [lbf*in]

General

Pressure, Strength

1 [Mpa]= 1 [N/mm1]

145.0377 [psi] = 145.0377 [lb/in1]˜
195.1999 [in*Hg] = 7500.617 [Toor]

General

Speed (velocity)

1 [m/s]
1 [m/min]
1 [mm/s]

3.18084 [ft/s] = 39.37 [in/s]
0.054681 [ft/s] = 0.656168 [in/s]
0.003181 [ft/s] = 0.03937 [in/s]

General

Acceleration

1 [m/s1]

39.37 [in/s1] = 3.18 [ft/s1]

General

Angular Speed

1 [rad/s]

9.55 [rpm] = 9.55 [r/min]

General

Angular
Acceleration

1 [rad/s1]

571.96 [r/min1] = 0.16 [r/s1]

General

Density

1 [g/cm³]

0.03613 [lb/in³] = 61.418 [lb/ft³]

General

Torsional Stiffness
or
Static Torsional

1 [N*m/rad]

0.1545 [lb*in/deg]

Couplings

Moment of Inertia

1 [kg*m1]
1 [kg*cm1]

3417.17 [lb*in1]
0.341717 [lb*in1]

Couplings
Linear Motion Units

Maximum Energy
Product

1 [KJ/m³]

0.11566 [MGOe]

Magnets

Magnetic Flux
Density

1 [Tesla]

1 [weber/m1] = 10000 [Gauss]

Magnets

Spring Rate
or
Spring Constant

1 [N/mm] ≈ 0.101 [kgf/mm]

5.71 [lb/in]

Magnets

Energy

1 [J] = 1 [Nm]

8.851 [lbf*in]

Shock Absorbers

Power

1 [W]
1 [KW]

0.00134[HP]
1.34 [HP]

General

Properties of Plastic Materials

(Product Selection) Permanent link

PROPERTIES OF PLASTIC MATERIALS

 NAME

PROPERTIES

USED BY MISUMI USA

ABS
(acrylonitrile- butadienetyrene)

Rigid, low-cost thermoplastic, easily machined and thermo-formed.

NO

Acetal
(In US commonly know
as Derlin)

Engineering thermoplastic with good strength, wear resistance, and dimensional stability. More dimensionally stable than nylon under wet and humid conditions.

YES

Acrylic

Clear, transparent, strong, break-resistant thermoplastic with excellent chemical resistance and weatherability.

YES

CPVC
(chlorinated PVC)

Thermoplastic with properties similar to PVC, but operates to a 40-60°F higher temperature.

NO

Fiberglass

Thermosetting composite with high strength-to-weight ratio, excellent dielectric properties, and unaffected by corrosion.

NO

Nylon

Thermoplastic with excellent impact resistance, ideal for wear applications such as bearings and gears, self-lubricating under some circumstances.

YES

PEEK
(polyetheretherketone)

Engineering thermoplastic, excellent temperature resistance, suitable for
continuous use above 500°F, excellent flexural and tensile properties.

NO
(available in Japan only)

PET
(polyethyleneterephthalate)

Dimensionally stable thermoplastic with superior machining characteristics
compared to acetal.

YES

Phenolic
(Bakelite)

Thermosetting family of plastics with minimal thermal expansion, high
compressive strength, excellent wear and abrasion resistance, and a low coefficient of friction. Used for bearing applications and molded parts.

YES

Polycarbonate

Transparent tough thermoplastic with high impact strength, excellent chemical resistance and electrical properties, and good dimensional stability.

YES

Polypropylene

Good chemical resistance combined with low moisture absorption and excellent electrical properties, retains strength up to 150°F.

NO

Polysulfone

Durable thermoplastic, good electrical properties, operates at temperatures in excess of 300°F.

NO

Polyurethane

Thermoplastic, excellent impact and abrasion resistance resists sunlight and weathering.

YES

PTFE
(polytetrafluoroethylene)

Thermoplastic, low coefficient of friction, withstands up to 500°F, inert to chemicals and solvents, self-lubricating with a low thermal-expansion rate.

YES

PVC
(polyvinyl chloride)

Thermoplastic, resists corrosive solutions and gases both acid and alkaline, good stiffness.

NO

PVDF
(polyvinylidenefluoride)

Thermoplastic, outstanding chemical resistance, excellent substitute for PVC or polypropylene. Good mechanical strength and dielectric properties.

NO

UHMW
(Ultra high molecular
weight polyethylene)

Excellent impact, wear and abrasion resistance. Low coefficient of friction, comparable to Teflon.

YES

PBT
(Polybutylene
Terephthalate)

Polyester similar in both composition and properties to PET. Higher impact strength, very similar chemical resistance, lower strength and stiffness than PET. Good in continues service in higher temp. (150°F).

YES

PPS
(Polyphenylene sulphide)

PPS is a crystalline material, usually supplied reinforced with glass fibers or
glass fibers and mineral fillers. The chemical and ionizing radiation resistance
of PPS is excellent and the maximum recommended service temperature for PPS is about 400°F.

YES

ABS
(Acrylonitrile Butadiene
Styrene)

It has good strength and toughness. Widely used as a coating material.

YES

Separable and Solid Roller Followers

(Product Selection) Permanent link

In the Misumi catalog we list roller followers as separable and solid (non-separable). With separable rollers the inners ring can be separated and with solid rollers inner rings cannot be separated:

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(click picture to enlarge)

Ball Screw Selection - Part 2

(Product Selection) Permanent link

To insure that appropriate ball screw is selected, basic safety checks need to be preformed. This includes:

  • Critical Speed
  • Limitation of buckling load
  • Life expectancy

The Misumi catalog offers examples of ball screw selection that also includes basic safety calculations. For more information please refer to Misumi metric 2008 catalog page 453.

Ball Screw Selection - Part 1

(Product Selection) Permanent link

When making a selection, various aspects of the ball screw should be examined. First step in the selection process after determining the operating condition is choosing the appropriate ball screw depending on screw accuracy grade, screw shaft diameter, lead and stroke. Accuracy of the ball screw such as axial play/clearance, cumulative lead error and fluctuation is determined by accuracy grade.

 

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(click picture to enlarge)

For more detailed information on accuracy of ball screw see Misumi metric 2008 catalog
page 463.

Misumi also offers different combinations of ball screw shaft diameters, leads and strokes.  Detailed specifications are listed in the dimensional table for each individual ball screw.

Metric and Inch Spur Gears

(Calculations) Permanent link

For metric gears the gear proportions are based on the module. Modules is the ratio of the “Pitch Diameter” to the “Number of Teeth”.


m (module)= d (pitch diameter (mm)) / N (number of teeth)


When module (m) number for metric gears is getting bigger- size of the teeth is getting bigger too.


In the USA the module is not used and instead the “Diametric Pitch” or “Pitch” (p) is used.


p= N (number of teeth) / d (pitch diameter (Inch))


When pitch (p) number for inch gear is getting bigger- size of the teeth is getting smaller.


Calculation example: Having two dimensions for each gear we will try to find number of teeth (N) using above equations:


Metric gear:
Ф (pressure angle)= 10°
m (module)= 0.8
N (number of teeth)= ?
d (pitch diameter)= 16 [mm]

 

Gear_Teeth

 

Inch gear:
Ф (pressure angle)= 10°
p (pitch)= 31
N (number of teeth)= ?
d (pitch diameter)= 0.615”


p= N/d ↔ N= p*d ↔ N= 31*0.615= 10


Conclusion: for both spur gears we calculated same number of teeth. Converting inch dimensions to metric (1”= 15.4mm) we can see how close these two gears are:


Knowing pitch (p) for inch gears we can simply calculate inch module:


m= (1”/31)= 0.03115


Or knowing pitch diameter (d) and number of teeth (N):


m= d/N= 0.615/10= 0.03115


Lets convert Inch module m= 0.03115 to metric using (1”= 15.4mm) converter from Inch to Metric dimensions.


0.03115 * 15.4= 0.794


Conclusion: We can see that the metric and inch spur gears are dimensionally very similar but we should not mesh them together duo to small differences developed during design and manufacturing stage.

How to mount BNG type Bearing Locknuts?

(Frequently Asked Questions) Permanent link

The question is what is the torque required to properly lock the bearings?

The bearing locknuts are usually used with angular contact bearings, but in some cases are also used with regular deep groove ball bearings. When installing the bearing locknuts, you won't really find an exact torque spec for this application. All that's required is that there is a minimum pre-load on the inner race of the bearing. It can be achieved by locking the nut "just snag" on the inner race. It can even be done by hand or with very low force when you use a wrench. It is critical that the nut is not mounted to tight because it may result in locking of the bearing race.

When you order the bearing locknut (the BNG family), it will come equipped with a set screw and a small soft metal "crash pad". Once you secure the nut on the inner race of the bearing, simply drop the crash pad in the threaded hole and drive the set screw in. The set screw will deform the crash pad and prevent the nut from loosening. The advantage of using soft material crash pad is that you will not damage the shaft thread shich is much harder that the pad.

Why use Diamond Shape Locating Pins?

 Permanent link

The Diamond Shape is a critical feature that helps with machining inaccuracies and smoother  locating operation. When two pins are installed onto one plate, the distance between two mounting holes must be extremely precise and even then, the work piece will not be placed on the base as easily as it would with the use of a diamond shape pin.

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(click images to enlarge)

The round pin is the datum pin that is located on the base and fixed in both X and Y direction. The Diamond pin oriented properly allows minimal misalignment in the X axis, but prevents the work piece to move in the Y direction. This way you eliminate small inaccuracies in respect to mounting hole distance and even if it’s manufactured with high precision, the operation will improve since there is less work surface area.

 

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Basics about the Misumi pipe threads?

 Permanent link

In “Metric” catalog Misumi use in most cases British (Japanese) standard pipe threads with some NPT (American) standard pipe threads for some components.

In “Inch” catalog we provide components with NPT (American) standard pipe threads.
See below letter designations for most popular pipe threads used by Misumi.

 

British Standards:

  • R (BSPT)- British standard taper pipe threads, External
  • Rc (BSPT)- British standard taper pipe threads, Internal
  • Rp or G (BSPP)- British standard pipe parallel (straight) threads

Japanese Standards:

  • PT- JIS taper pipe threads. PT threads are functionally interchangeable with BSPT threads. BSPT is old designation for R and Rc.
  • PS- JIS parallel (straight) internal pipe threads (to mate with PT threads)
  • PF- JIS parallel (straight) pipe threads. PF threads are functionally interchangeable with BSPP threads. BSPP in old designations replaced with G.
  • For more information about the Japanese standards, click here.

American standards:

  • NPT American standard taper pipe thread for general use
  • For more information about the American standards, click here.

Bearings for Special Environments

(General) Permanent link

Sometimes design and environmental conditions are such that special type of bearings is needed. Perhaps bearings need to be waterproof, heat resistant or even nonmagnetic.

Misumi is offering comparison table for bearings for special environment (table 1.) to help customer evaluate bearing performance and select bearings with appropriate characteristics (Misumi 2008FA Metric catalog page 650).

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(click picture to enlarge)

Greases for special environments

(Frequently Asked Questions) Permanent link

Misumi products are used in wide range of fields, characterized by different environmental conditions. In order to meet the specific needs Misumi is offering different type of grease.

Type Product Name  Features
L Type ET-100K (Kyodo Yushi) High heat resistance and oxidation stability. Also, high adhesion and cohesion. Limited splash or leakage.
G Type LG1 (Nihon Seiko) Limited dust generation and suitable for use in clean room. High corrosion resistance.
H Type FGL (Lubriplate®) Formulated to meet the increased demand of food, beverage and pharmaceutical industries. (NSF H-1 Registration No.43534)

For more information about different grease types see page 130 in our 2008 catalog or simply click on link below:
https://www.misumiusa.com/PDFViewer.aspx?Metric=true2008&Page=119

 

Different grease types can be specified with following components.

Grease Product
L Type

G Type

H Type
Linear Ball Bushings

Stroke Ball Bushings

Linear Rotary Bushings

Linear Miniature Guides

Linear Guides

Precision Ball Screw

Rolled Ball Screws

 

Cad Configurator Improvements

(General) Permanent link

We are happy to inform you about some CAD Configurator improvements that we were able to implement recently.

1. We realized that not everyone is interested in seeing the preview of the parts and would like to go directly to download. (Especially since preview generation and part download speeds averaged about 30 seconds each).
As a result, we added an additional feature to the configurator. Instead of one “Generate” button that would first take you to the preview of the part and then allow you to download it, we now have two buttons: “3D Preview” and “Download”. This allows you to go directly to download without seeing the preview first.

1. In order to improve the speed of the Misumi configurator, we decided to install dedicated servers, so we do not have to compete with other companies, who’s catalogs are served by Part Solutions.
The servers are installed and went online this week. This change resulted in very significant latency improvements. The typical download and preview speeds are now in a 10 second range.

One of other issues we heard about was that the files are now in a ZIP form. We have not addressed it yet, but we discovered that you can eliminate a few steps if you use some of the more common ZIP programs like Winzip or Winrar. Instead of saving the file and extracting it later to a directory of your choice, you can just choose to open it and drag and drop the content to your cad system window. Please, remember that if the downloaded file is a macro, you should close all parts and assemblies first.

We will continue to work on improvements in many areas and we’ll let you know about them as soon as they are implemented.

Radial Bearing Tolerance

(Geometric Tolerances and Fits) Permanent link

If you are checking some of the deep groove ball bearings, angular or needle bearings you probably noticed that there is no tolerance specified for inner and outer race of the bearing. Only note provided is that these bearings are Bearing Precision class 0 (JIS B 1514). This class is equal to ANSI ABEC-1 class and in technical section of Misumi Metric catalog (2008) on page 1539 you can find table tolerance for inner and outer diameter for precision class 0 ( ABEC 1).

https://www.misumiusa.com/PDFViewer.aspx?Metric=true2008&Page=1539

Tolerance of Plated Parts

(Frequently Asked Questions) Permanent link

Q: Do the Dimensions and Tolerances in Misumi Catalog apply to parts before or after plating?


A: Dimensions shown in catalog apply to finished product.

Interchangeable Linear Guides

(Frequently Asked Questions) Permanent link

Customers often gets confused why some linear guides (including miniature) in our catalog are described as “interchangeable”.

In the Misumi catalog word “interchangeable” is used to describe linear guides whose components can be purchased separately. The catalog page for the interchangeable linear guide will show separate part number (price and days to ship) for the guide rail and guide block . Of course when ordering parts separately, customers need to specify the same size for both parts (rail and block) if they are to fit together.

 

E.g. Catalog page 305/2008 catalog.

SEBZ10- Interchangeable Miniature Linear Guides with Standard Block (shipped as a set)

SEBZ10-Guide Block for SEZB10 (can be purchase separately)

STZL10-Guide Rail for SEZB10 (can be purchase separately)

 

If customers buy two same (size) sets (1rail+1block) but later on decides that only one rail with two blocks is needed, he/she can simply remove a block from one rail and add it to a second rail.

If the linear guide is not interchangeable then this unit can be purchased only as a set and customers should not remove block(s) from the rail and mount them on the different rail as in previous example.

What is the fit between our Linear Shafts and Linear Ball Bushings?

(Frequently Asked Questions) Permanent link

If shafts with g6 tolerance are used with linear ball bushings fit vary from clerance to transition fit with dominance of clerance fit. If shafts with h5 tolerance are used fit vary from clerance to transition fit also but with dominance of transition fit (light preload fit).

Low Temperature Black Chrome Plating

(Materials, Surface Treatments and Hardness) Permanent link

Low Temperature Black Chrome plating (LTBC) is a technology which uses an electrochemical reaction below 0º C. Through the plating process, an alloy-like diffusion layer is formed at the outer margin of the part, allowing chrome particles to completely integrate the base material and create an "inseparable" bond. This means the plating can neither be peeled off nor flaked off. The surface consists of a uniform film creating an extremely resistant rust protection layer. LTBC-plated shafts and components provide service life exceeding 10 years and, in some cases, up to 10 years and beyond is possible. Components with this plating have fracture-resistant surfaces with a high level of alternate-bending strength. The tolerances of the components remain practically unaffected. These components can be used in applications specifying corrosion resistance or minimal light reflection making LTBC suitable for use in optical applications where low light reflection is required.

Low Temperature Black Chrome Plating 

 

Misumi offers low-temp, black chrome plating on a variety of the company’s motion components, including linear shaft, linear bushings, linear guides, ball screws and others. Other Misumi hardware is also offered with this coating, including precision-class washers.

 

We have been asked by several customers if this service is available in the US. Unfortunately we were not able to locate any US coating companies that provide this service. All our components that we offer with LTBC Plating are manufactured and coated in Japan.

 

 

MISUMI Global Voice - Volume 5

 Permanent link

fa_locatingpins.jpg 

 

Need more information about locating pins?

 

Check out the below link to the MISUMI VOICE Vol5. This issue features a technical article covering the various usages for locating pins:

http://www.misumiusa.com/globalvoice/volume5/article1a.aspx

What is new about the NEW line of Linear Ball type XY-Stages?

(Frequently Asked Questions) Permanent link

XY Stage 

 

The Linear Ball type stages use an integrated Gothic Arc design which provides high rigidity and precision, but uses fewer components and thus decreases the probability of alignment errors. It requires less space, and is more cost effective. It is made of stainless steel, which does makes it slightly heavier and gives it a metallic look.

The 2008 Metric Catalog features10 pages of NEW Linear Ball type products starting on page 935. 

 

Click here to visit page 935 in the online catalog. 

Principal differences between Stainless Steels?

(Materials, Surface Treatments and Hardness) Permanent link

It is understood that all stainless steel is not created equal. There is a definite difference between the various stainless steels available today. This blog will discuss the differences as they pertain to mechanical components used in factory automation.

AUSTENITIC GRADES- (300 series) are non magnetic in the annealed condition, although some may become magnetic after cold working. They can be hardened only by cold working , and not by heat treatment. Combine outstanding corrosion resistance with good mechanical properties over a wide temperature range. The most common grades are: 303, 304, 316, 311 etc…Misumi offers 303, 304 and 316 grade.

FERRITIC GRADES- are always magnetic and contain chromium but no nickel. They can be hardened to some extent by cold working, but not by heat treatment, and they combine corrosion and heat resistance with moderate mechanical properties and decorative appeal. The ferritic grades generally are restricted to a narrower range of corrosive conditions than austenitic grades. The most common grades: 405, 408, 430 (Offered by Misumi) etc… Misumi offers 430 grade.

MARTENSITIC GRADES- are magnetic and can be hardened by quenching and tempering. They contain chromium, and with two exceptions, no nickel. Some are modified to improve machinability and other have a small addition of nickel to improve the mechanical properties or their response to heat treatment. Some of them have greatly increased carbon content and are hardenable to the highest levels of all stainless steels. These are excellent for service in mild environments such as the atmosphere, freshwater, steam, and weak acids, but are not resistant to severely corrosive solutions. The most common grades: 410, 410, 440C (Offered by Misumi). Misumi offers 410 and 440C grade.

M2.6 thread is the correct size or a catalog mistake?

(Geometric Tolerances and Fits) Permanent link

M1.6 thread size is not a catalog mistake.  This is the correct size when listed in the catalog.  If you are having trouble locating hardware, we also sell hexagonal socket head cap screws with a M1.6 thread (Misumi part numbers: CB1.6-5, CB1.6-8, CB1.6-10, CB1.6-11, and CB1.6-15, where the last number in the part number refers to the length).

Which dimensions are more reliable: catalog or model?

(Geometric Tolerances and Fits) Permanent link

Whenever there is a discrepency between dimensions between the catalog and the cad model, the catalog is always correct.  To better understand why this is the case, it is important to understand the cad model providers (3DPartStream.net or PartSolutions) are hired to create the cad models in their respective software suites.  They use the catalog as their source for geometrical information.  Because of this, the catalog is always right.

Surface Roughness Information in Drawings

(Frequently Asked Questions) Permanent link

Our catalog often shows surface roughness information at the upper right hand corner of the drawing. This information will show a roughness value, and one or multiple values in parentheses. Please, see the example from page 159 from FA 2008 metric catalog. "Photo 1" The value before the parentheses means: unless otherwise specified, all surfaces are 6.3 μm and all values in parentheses represent other surface roughness specified on the drawing.041808_sm.jpg 

Surface Finish (Surface Roughness) Specification

(Geometric Tolerances and Fits) Permanent link

Surface finish (surface roughness) specifications is a large topic. In fact discussing this topic in length would take at least a few pages. For this blog entry I would simply like to focus on the machined components in the Misumi catalog and point out that these components have surface finish specification (symbol and value) specified in the catalog. Please note that the surface roughness average value (Ra) in the Misumi metric catalog is measured in μm (micrometer-10-6mm) while in Misumi inch catalog it is measured in μin (microinch-10-6in).

See below as the preferred values for Roughness Average (Ra) are given in following table1.

Surface Finish Table 

Misumi Metric Thread Callout

(Frequently Asked Questions) Permanent link

Metric threads have a different callout then US (inch) threads. Metric threads specify the pitch while US threads specify number of threads per inch.

Example:
Metric
M6 x 1 ( 6- nominal thread diameter in mm, 1mm-distance between threads in mm)

Inch
¼-10 (1/4-nominal thread diameter in inch, 10-number of threads per inch)

Pitch from metric fasteners can be coarse, fine and extra fine. The pitch callout on coarse thread is often omitted. For example, “M6” thread by default stands for coarse thread M6 x 1. Thread call out that includes the pitch “M6x0.75” specifies non-coarse thread (in this case fine thread). Also all threads are right-hand threads unless otherwise specified.

Majority of standards (JIS, ISO, DIN) follow this convention.

For more information about Metric Coarse Threads please see pages 1568/1569 in the 2008 Misumi Metric catalog. Also, see the following links.

Table for Metric Coarse Screw Threads
Table for Metric Fine Screw Threads

Case Hardness of Precision Linear Shafts

(Materials, Surface Treatments and Hardness) Permanent link

When dealing with the Case Hardness of Precision Linear Shafts very often Misumi engineers are asked if our linear shafts are case hardened or through hardened. If you look at the part specification table for Misumi precision linear shafts you will notice that a majority of our shafts are induction hardened. Induction hardening is just one of the ways to achieve case (surface) hardness. Through the induction hardening process the top layer of the shaft is hardened which increases the strength and wear resistance. At the same time the shaft core remains unaffected and material ductility and other physical properties are preserved. Hardness varies with the type of material while effective hardness depth depends on shaft diameter. Values for effective hardness depth can be found in Misumi catalog. See the following links.

Effective hardness depth for metric shafts
Effective hardness depth for inch shafts

Tolerances of Misumi Components

(Geometric Tolerances and Fits) Permanent link

We often receive inquiries regarding unspecified tolerances of particular component dimensions in the catalog.  We always do our best to inform the customer of all tolerances right on the product page. You will notice that the Misumi catalog covers most product dimensions as well as tolerances. There is, however a rule that is not clearly explained. Unless otherwise specified on the product page, the tolerance for most of Misumi Metric machined components (i.e. washers, collarsbearing housingslocating pins etc.) is located in the technical data section of the catalog. Please follow the medium precision tolerance in "Regular Machining Dimension Tolerance" tables.

It is always best to check with Misumi Engineering Team (engineering@misumiusa.com) and verify the tolerance.

Remember that some component tolerances (like bearingsbolts etc.) are also located in the back section of the catalog and have their own, special section.

We strongly suggest sending inquiries to engineering on all other unspecified tolerances for parts that are not machined (metal casts, extruded or molded parts etc.)


 

Welcome to the Misumi USA Engineering Blog

(General) Permanent link

Welcome to the Engineers Blog, the blog for engineers, written by engineers. Common topics for this blog will include geometric tolerances and fits, materials, surface treatments and hardness, various calculations, product selection criteria plus frequently asked questions and other topics as well. Our head of engineering, Chris Blaszczyk, will be contributing to this blog regularly and is sure to add to this list. Chris is often busy creating materials and presenting at our Configuration Tech Seminars which have proven to be a valuable resource for engineers.

This blog is dedicated to mechanical components used in automation and the machine design and build process. It is meant to be a forum of knowledge that will help the engineer quickly and easily find resourceful information for various topics. In addition we will use this blog to link to various helpful technical resources across the web. To get things started feel free to check out this section of technical reference guides by visiting: https://www.misumiusa.com/PDFViewer.aspx?Metric=true2008&Page=1516.

Lastly, feel free to comment on any of our postings to this blog. We welcome and encourage all comments and feedback. Remember this blog is here for you to use as a resource so please enjoy.

 

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MISUMI reserves the right to delete comments that may be false, illegal, harmful, commercial, defamatory, and libelous or about a competitor, and anything we find inappropriate as a comment for this topic without notice to the individual who commented. Any and all content and information provided in this blog is for informational purposes only. The Engineering Blog falls under the same terms and conditions and privacy policies as the MisumiUsa.com web site. MISUMI USA, Inc. makes no representations as to accuracy, completeness, suitability, or validity of any information and will not be liable for any errors, omissions, or delays in this information or any losses, injuries, or damages arising from its display or use. All information is provided on an as-is basis and is to be used at your own risk.