Chapter 4 Angular Measurements
Angular Position Measurements
4-68 Measurements Reference Guide
4 Rejoin the precision index table’s top and base, and use the locking loops
to hold them together. If you will be storing the table, be sure to read the
storage instructions above.
Clutch
The angular position measurements fixture’s clutch uses a nonmetallic
washer glued to the end of the clutch control shaft. Occasionally, due to
wear or contamination, you may have to clean or replace this washer. The
procedures to do this are given below.
Disassembly
1 Remove the fixture from the precision index table, if necessary.
2 Remove any optic mounted in the fixture, if necessary.
NOTE The clutch spring exerts slight pressure between the retainer ring and the
fixture’s top plate.
3 Remove the four M4 hex-drive cap-head screws that fasten the clutch
retainer ring to the top plate.
4 Remove the clutch shaft from the retainer ring.
5 Perform the cleaning or replacement procedures below.
Cleaning the clutch washer
1 If necessary, perform the disassembly procedure above.
2 Using suitable solvent such as soap, wash, then dry the clutch washer and
its mating surface on the underside of the clutch retainer ring. Be careful
to thoroughly dry these parts and not to contaminate their surfaces with
fingerprints or anything else that may act as a lubricant.
3 Replace the clutch control shaft in the retainer ring and re-attach the
retainer ring to the fixture’s top plate. Only slight pressure is required to
overcome the pressure of the clutch spring that tends to push the ring and
plate apart.
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