Chapter 4 Angular Measurements
Angular Position Measurements
Measurements Reference Guide 4-45
Creating the control link
The main goal of the procedures below is to connect the angular position
measurement fixture to the machine’s spindle or other lifting mechanism
while ensuring there is no outside force on the clutch control shaft in any
direction. The fixturing aids listed in Figure 4-17A/B/C/D are provided to
help you do this.
In long linkages, the Agilent posts may be too flexible, so custom fixturing
may be needed.
Taking care of the measurement fixture’s clutch
See Figure 4-25.
The angular position measurements fixture’s friction clutch prevents
unwanted movement of the precision index table’s top when it is
disengaged from the table’s base.
NOTE The clutch must never carry any of the weight of the linkage after final
assembly and tightening of the linkage.
To prolong clutch life, do not rotate the clutch control shaft with respect to
the rest of the fixture when the clutch is engaged. The clutch is normally
engaged. To disengage it, rock the control shaft or press it toward the
fixture’s base.
If the clutch has not been used for more than about two days, it may be
difficult to disengage it. Before using the clutch, you should manually
disengage it. In this case, you can rock the clutch by manually tilting the
clutch control shaft with respect to the rest of the angular measurement
fixture.
To keep the clutch from being rocked or disengaged during installation,
whether due to the weight of the linkage assembly or due to tightening,
hand-tighten the clutch breakaway nut onto the clutch shaft.
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