TB 9-5220-212-40
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Granite Surface Plate. Federal Specification GGG-P-463C was used as the
prime data source in compiling these instructions. The equipment being calibrated will be
referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. Variations among models are described in text.
b. Time and Technique. The time required for this calibration is approximately 8
hours, using the physical technique.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Size and Accuracy.
Work Surface Size
Work Surface Accuracy
Work Surface Size
Work Surface Accuracy
(inches)
( inches)
(mm)
(m)
Grade
Grade
Grade
Grade
Grade
Grade
Width
Length
Width
Length
AA
A
B
AA
A
B
10
10
25
50
100
250
250
0.635
1.27
2.54
12
12
50
100
200
300
300
1.3
2.6
5.2
12
18
50
100
200
300
450
1.5
2.9
5.9
18
18
50
100
200
450
450
1.6
3.3
6.6
18
24
75
150
300
450
600
1.9
3.8
7.6
24
24
75
150
300
600
600
2.2
4.3
8.6
24
36
100
200
400
600
900
2.9
5.7
11.5
24
48
150
300
600
600
1200
3.9
7.8
15.5
36
36
150
300
600
900
900
3.6
7.2
14.4
36
48
200
400
800
900
1200
4.6
9.2
18.4
36
60
250
500
1000
900
1500
5.9
11.8
23.6
36
72
300
600
1200
1500
1800
7.5
15.0
29.9
48
48
200
400
800
1200
1200
5.6
11.2
22.4
48
60
300
600
1200
1200
1500
6.9
13.8
27.6
48
72
350
700
1400
1200
1800
8.5
17.0
33.9
48
96
500
1000
2000
1200
2400
12.5
25.0
50.0
48
120
700
1400
2800
1200
3000
17.7
35.4
70.8
60
120
750
1500
3000
1500
3000
18.5
36.9
73.9
72
96
600
1200
2400
1800
2400
15.4
30.8
61.6
72
144
1100
2200
4400
1800
3600
26.9
53.8
107.7
