TB 9-5210-204-24
NOTE
For larger frame micrometers, it may be necessary to stack
several gage blocks vertically on rubber jaws of vise to perform
technique of (10) through (15) below.
NOTE
Vise should have rubber covered jaws to protect TI. Vise
should be adjusted to hold TI firmly, but not so tight that it will
distort TI frame.
(10) Rest appropriate size gage block on rubber jaws of vise so that gage block is flat
(11) Place ball micrometer tester small ball (0.1875 in.) between gage block top
gaging surface and TI spindle face at point A as shown in figure 1.
(12) Adjust ratchet and micrometer as necessary to obtain a measurement of the ball
diameter. Note indication to the nearest 0.0001 inch (by estimation).
NOTE
If TI has a 0.001 inch readout micrometer, read to nearest one-
half minor division. If TI has a 0.0001 inch vernier, read
direct.
(13) Repeat technique of (11) and (12) above for points B, C, D and E, figure 1.
(14) Reset micrometer to increase anvil to spindle dimension by 1/16th inch. Replace
ball micrometer tester small ball with large ball (0.250 in.) and repeat technique of (11) through
(13) above.
(15) For 0.001 inch readout micrometer, verify that the five readings have a
maximum difference of one-half of a minor division for each ball. Use tolerances in table 4
b. Adjustments. No adjustments can be made.
a. Performance Check
(1) For 0 to 1 inch range micrometer caliper, rotate thimble until surface of spindle
and anvil face make gentle contact, then use correct method for type of TI as described in
note in paragraph 7. If indication on barrel is not zero, perform b below.
(2) For micrometer caliper greater than 0 to 1 inch in range, use appropriate gage
block from gage block set that will leave a measuring range of 1 inch. Rotate thimble until
spindle face contacts gage block. If indication on barrel is not zero, perform b below.
b. Adjustments
(1) Rotate thimble until measuring face of anvil and spindle come together, or make
contact with appropriate gage block.