TB 9-5210-210-50
NOTE
Each style of the TI requires that the TI be placed in a specific
position in the dial indicator calibrator prior to performing
calibration. Style A is connected as shown in figure 2; style B
must be connected with the dial face in a horizontal position.
Style C must be connected with the dial face in a horizontal
plane and contact point lever straight. During calibration of a
style C TI, the lever arm shall not deviate more than 15 from
the horizontal plane; to insure the lever arm does not deviate,
the contact point lever must be positioned horizontally at
midrange to minimize any cosine error.
7. Accuracy
a. Performance Check
(1) Adjust mounting control on dial indicator calibrator (A1) to insure that contact
point of TI is slightly above plunger on dial indicator calibrator.
(2) Adjust dial indicator calibrator to obtain a zero indication on the black scale.
(3) Adjust mounting control until the contact point makes contact with plunger on
dial indicator calibrator.
(4) Set the TI to zero by rotating the bezel.
(5) Adjust dial indicator calibrator until the equivalent first-numbered division
(inward deflection) on the TI is obtained on the dial indicator calibrator (25.4 mm = 1 in.).
NOTE
If the TI has been graduated in millimeter steps rather than
inches, convert the millimeter-numbered division to inches and
set dial indicator calibrator accordingly.
(6) The TI should indicate within the limits specified in table 1.
(7) Repeat (5) and (6) above at each numbered division within the range of the TI.
(8) Repeat (5) through (7) above at each numbered division on the TI in an outward
deflection.
NOTE
Advance dial indicator calibrator slightly past last observed
reading and then change direction to last observed reading;
this will take up any backlash in calibrator.
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