TB 9-5210-218-40
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
o
ANGLE PLATE
Range:
90
Taft-Pierce, Model 9193
Accuracy: Square within
0.0008 in/8 in.
GAGE BLOCKS
Range:
0.050 to 4 in.
(7901961)
Accuracy: 0.0005 in.
PRECISION LEVEL
Range:
N/A
(7916928)
Accuracy: 30 arc-sec
SINE PLATE
Size:
10 in
Robbins Engineering, Model
o
Range:
0 to 45
A10
Accuracy: 30 sec (angle)
SURFACE PLATE
Range:
18" x 24"
DoAll Mfg. Co., 18 x 24-in.
Accuracy: N/A
(7900123)
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 manual for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
a. Allow TI and test equipment 4 hours to stabilize at ambient temperature.
b. Inspect TI top and bottom reference surfaces for defects and cleanliness. Repair and
clean as necessary.
c. Use precision level to level surface plate within 30 sec-arc along length and width of
surface plate.
8. Angle Indication Calibration
a. Performance Check
(1) Setup equipment on surface plate as shown in figure 1. Place TI on the base,
bubble level in the lower left corner.
