TB 9-4935-558-40
CALIBRATION PROCESS
8. Force Dimension and Load Check
a. Performance Check
(1) Place the weight table and 94 lbs. weight on the slider. TI force gage will
indicate between 90.0 and 100.0. Record reading. If force gage reads out of tolerance
return complete TI to depot.
(2) Remove weights and weight table from TI.
(3) Place C-clamp in a vise with C-clamp in a vertical position, with the adjusting
screw on C-clamp on top. Place the TI on the C-clamp with TI slider on bottom and tighten
until the force gage indicates the same reading as recorded in step (1) above.
(4) Position the micrometer frame on the TI and measure the internal depth of the
slider. The micrometer frame will indicate the dimension on the calibration label 0.001
inch, if not perform b below. Disregard first figure (whole number) on calibration label
when reading micrometer.
(5) Remove TI from C-clamp.
b. Adjustments
(1) Remove micrometer from and C-clamp from TI.
(2) Loosen the socket head adjusting screw (1, fig. 1), at the back of the slider, four
turns.
(3) Position the TI on its back.
(4) Remove the socket head screw at the bottom center of the TI.
(5) Remove the shim(s) between the bottom of the gauge assembly and the frame.
(6) Remove the gauge assembly from the frame. Use care not to lose the loading
ball that is between the pressure button of the gauge assembly and the end of the slider
(7) Clean the mating surfaces of the gauge assembly and the frame with a soft cloth.
(8) Adjust the shim thickness to achieve a correct micrometer frame reading as
listed in (a) and (b) below:
(a) If the micrometer frame reads low, remove shim(s) as required.
(b) If the micrometer frame reads high, add shim(s) as required.
NOTE
A 0.001 inch shim will move the gauge reading approximately
10 lbs. The shim utilized in the TI is laminated from 0.002
inch shim stock. The thickness can be reduced by removing one
or more 0.002 inch laminates or by sanding the shim, using 400
grade sandpaper.