Chapter 4 Angular Measurements
Angular Position Measurements
4-50 Measurements Reference Guide
For right-angle spindle and table axes
See Figure 4-27 or Figure 4-28.
This case is similar to the parallel-axes case above, except in how the
clutch control shaft is connected to the machine’s spindle or other part
that will control it.
1 Perform all appropriate steps of the setup, mounting, and aligning
procedures above.
2 Place the clutch breakaway nut on the clutch control shaft, if it is not
already there, but do not tighten it.
3 Place the adapter on the clutch control shaft, if it is not already there. Use
an open-end wrench to keep the shaft from turning while you use a second
wrench to tighten the adapter onto the shaft.
4 If necessary, jog the clutch control shaft to position it in the center of its
hole in the angular position measurements fixture.
5 Insert a post in the spindle, with its externally-threaded end extended.
6 Add a stub post to the post in the spindle. Using a wrench or similar tool
through the hole in each post, tighten the posts together.
7 If necessary, loosen the post assembly in the spindle so its end can touch
the adapter on the clutch control shaft.
8 Rotate the adapter (and clutch control shaft) so the adapter’s mating face
is parallel with the end of the post assembly in the spindle and the
clearance hole lines up correctly. If more than a few degrees of turning is
necessary, jog the control shaft as you turn it, to reduce clutch
engagement. Turning the shaft with the clutch engaged increases wear on
the clutch, shortening its useful life.
9 Position the machine as necessary to center the adapter’s clearance hole
on the end of the post assembly in the spindle.
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