TB 9-5220-213-24
a. To achieve temperature stabilization, allow TI to normalize in same environment as
standard for a minimum of four (4) hours prior to calibration.
b. On the DA Form 3023, Gage Record, verify that the drawing number and gage
revision are current and the identification number matches the gage set.
c. Gloves will be worn when handling the clean TI. Wipe the TI with a soft cloth
(deburring stone may be used) to clean off any burrs taking care not to damage the finish.
Clean surface of TI using denatured alcohol (or other solvent) and soft cloth, wipe dry, and
place on cloth. TI must be free of dirt, dust, oil coating or any foreign material. If excessive
cleaning or deburring was preformed an additional hour to stabilize is needed.
d. Visually inspect TI for seams, cracks, nicks, burrs, scratches, breaks, bends, rust,
pitting, excessive wear, or other forms of irregularity that could affect the dimensional
tolerances.
e. Verify that the correct information is stamped in the correct areas on each TI, see
figures 1 and 2.
f. Clean anvil and spindle on standard removing dirt, oil, or any foreign material.
g. Zero the standard. Repeat zero throughout the procedure as necessary.
h. To confirm readability of standard, measure a calibrated gage block in the
approximate size range of TI (0.200 inches recommended) in 4 different sections of the gage
block. Readings must also be repeatable. The standard should read the same as the
nominal indication on the gage block within the resolution and accuracy of the standard
(0.0001 inches).
8. Thickness
a. Performance Check
NOTE
The black circles in figures 1 and 2 represent approximate
centers of the test points to be taken within the critical
measurement area. Some readings should be taken at the
leading and side edges in the critical measurement area. Some
of these test points will overlap, due to the size of the anvil and
spindle of the micrometer. Do not position the anvil in the
center section of the headspace gage or past the first inch of
the timing gages.
NOTE
The beveled edges on the headspace gage may not be uniform.
The anvil and spindle of micrometer must both be positioned on
the parallel, flat critical measurement area of the gage and not
located in the beveled section of the gage (fig. 1a.).
(1) Position the GO section of TI Headspace gage so that one of the test points in the
critical measurement area ( fig. 1) is flat against the anvil of the zeroed standard.
