Case 1 (See Figure 1)
The structure of the shaft with retaining ring groove is as follows:
- The two bores on each of the two shaft fixing plates, through which both ends of
the shafts are fixed, determine the parallelism of the two shafts. Therefore, the
distance between the two bores on the shaft fixing plates should be specified with
tolerance.
- The precision of the shaft installing bores on the two shaft fixing plates must
be specified with clearance fit (H7) that is required for precision fitting with
minimal rattling.
- Be sure to use large fixing bolts to secure the relative positions of the shaft
fixing plates to the base plate.
- The distance between the two retaining ring grooves on the shaft ends (distance
L selectable in units of one millimeter) must be slightly longer than the outer
distance between the two shaft fixing plates but without allowance in the longitudinal
direction of the shafts.
Figure 1
Case 2 (See Figure 2)
The structure of the shaft holder bracket is as follows:
- The parallelism of the two shafts is determined by the parallelism of the shaft
holder bracket fixing plates (via which both ends of shafts are fixed) and by the
precision of installing intervals of the shaft holder brackets.
- Shaft holder brackets can be installed by tapping the shaft holder bracket fixing
plates.
- This structure assures high rigidity as the precision flanges hold the shafts.
- Depending on the shape of the shaft ends on the opposite side, a variety of assembling
procedures are possible. When shaft holder brackets are used for both sides, installation
should be made by temporarily fixing the shafts, movable units and shaft holder
brackets on the fixing plates before securing the plates on the peripheral structure.
Also, be aware of the complexity of disassembling and maintenance of the shafts
before starting the design of your mechanism.
Figure 2:
1. Installing shafts with shaft holder brackets