Positioning Adjusting Screws

How to Use a Positioning Adjusting Screw

Workpieces are positioned by the face of a positioning adjusting screw. By turning the adjusting screw, the positioning point in the screw axis direction can be adjusted. [Photo. 1] and [Fig. 8] show an example of the adoption of a positioning adjusting screw for adjusting the height of a workpiece setting table.

• After positioning, lock the adjusting screw with a nut in order to keep it tightened. This operation needs to be repeated because the adjusted point moves out of position when this nut is tightened. It is advisable to make fine adjustments with the nut temporarily tightened, and perform positioning so that the final adjustment will end with slight deformation of the screw.
• When the material of an adjusting screw is not stainless steel, its end is heat-treated to a hardness level of approximately 45 Hrc or higher in order to reduce deformation and wear.
• Adjusting screws are available in two types, fine pitch threads and coarse pitch threads, in order to ensure conformity with the degree of precision in positioning.
• It is advisable to insert a stop pin into the opposing face of the workpiece with which the end of the adjusting screw comes into contact, as this face should possess a high level of plane precision and be made of a hard material (refer to [Fig. 9]).
• Using two positioning adjusting screws ensures efficient adjustment of the parallel precision of long workpieces (refer to [Fig. 10])Positioning adjusting screwsThis lecture describes positioning adjusting screws.

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