AMMCO 2760, 2760-50 User Manual

Inch & Metric Rotor Micrometers

Operating Instructions with Parts

Identification

No. 902760

No. 902760-50

Item Part No. Qty. Description

1 924999 1 Frame/Anvil Assembly
2 900205 1 Cap Screw
3 922402 1 Inch Spindle

922407 1 Millimeter Spindle

4 922396 1 Inch Barrel

922405 1 Millimeter Barrel

5 922397 1 Inch Thimble

922406 1 Millimeter Thimble
6 906148 1 Set Screw
7 922404 2 Spring
8 920379 2 Detent Ball
9 922403 1 Friction Strip

10 922398 1 Friction Thimble

Rotor Condition

Measure the rotor’s thickness at three (3) or more
points around its circumference about one (1) inch (2.54
cm) in from the outer edge. Note: If the rotor has
grooves worn in its friction surfaces measure its thick­ness with the point of the anvil in the deepest groove. If
the rotor thickness varies between readings the rotor
should be machined. The rotor should be replaced if the
rotor’s thickness at any point is less than the minimum
established by the vehicle manufacturer, or if it will be
less after reconditioning.

Calibration

1. Loosen the cap screw holding the micrometer

assembly in the frame.

2. Zero the thimble to the zero mark of the barrel by

turning the friction thimble.

3. Push the thimble/barrel “assembly” against the

anvil.

4. Tighten the clamp screw while maintaining the set-

ting.

5. Check the zero setting by backing the spindle away

from the anvil and closing the micrometer by its friction
thimble.

6. If the micrometer does not read zero, loosen the

cap screw and reset the thimble to the same number of
divisions on the other side of the zero mark on the thim­ble. Repeat steps 3, 4, and 5.

922410 06 07/02 © COPYRIGHT 2002 HENNESSY INDUSTRIES AND AMMCO ALL RIGHTS RESERVED PRINTED IN U.S.A.

AMMCO, Inc. • Hennessy Industries • 1601 J.P. Hennessy Drive, LaVergne, TN 37086-3565

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