TB 9-5210-220-24
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manuals for this TI.
d. Unless otherwise specified all controls and control settings refer to the TI.
7. Equipment Setup
a. Remove TI from protective case.
b. Visually inspect TI for damage.
CAUTION
Do not disassemble or remove the spindle assembly. This will
cause damage to the stator mount assembly which will require
factory repair.
c. Rotate thimble along full length of thread range to determine if roughness, binding,
or irregularities occur. Ensure lock, binder ring is completely open as partial closing may
cause rough travel.
d. TI measuring surfaces must be clean. Clean surfaces by placing a piece of paper
between the spindle and the anvil. Tighten the spindle lightly against the anvil and slowly
drag out the paper. More stubborn accumulations may require a light solvent wipe along
with this paper method.
NOTE
Throughout this entire procedure, make precise measurements
by rotating the friction thimble slowly until surface of spindle
makes gentle contact. Correct tension is achieved when
continued gentle rotation results in a stationary shell with a
slipping thimble.
e. Set TI to zero (spindle in contact with anvil face). If indication on barrel sleeve to
shell is not zero, use spanner wrench provided with TI to zero the sleeve to the shell.
8. Parallelism
a. Performance Check
(1) Position ball micrometer tester small ball (0.1875 inch) between the TI anvil and
spindle measuring faces at point A as shown in figure 1.
