TB 9-5220-211-50
Manufacturer and model
Common name
Minimum use specifications
(part number)
GAGE BLOCK SET
Range: 1.2 to 6.3 in
Grade 1, Class I (79010765)
Accuracy: 0.000012 in
HEIGHT GAGE
Range: 1.2 to 6.3 in
Federal Products Corp.,
Electro-Check, Model 230P-121
Accuracy: 0.00001 in
(7904823)
SURFACE PLATE
DoAll Mfg. Co., 18 x 24-in.
Accuracy: 0.000050 in
(7900123)
6. Preliminary Instructions
process. Personnel should become familiar with the entire bulletin before beginning the
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 results of each test and whenever the test
requirement is not met, take corrective action before continuing with the calibration.
two stacks of gage blocks on surface plate. The two stacks of gage blocks must be the same
height as the two rolls of the TI, within the measuring range of the height gage (fig 1).
Allow all equipment to thermally stabilize for at least 12 hours.
NOTE
The approximate height of the gage block buildup can be
determined prior to thermal stabilization by alternately
moving the height gage stylus over the sine plate rolls and the
corresponding gage block buildup. After the items have
thermally stabilized, they must not be handled with the hands.
Use forceps for handling the TI and gage blocks.
