Starrett 3814 - Round Correction Factors; Corrections for Rockwell C, A and D Values; Corrections for Rockwell B, F and G Values

Operating Instructions & Parts Manual
Page 14
Round Correction Factors
Corrections to be added to test results in the following scales for various diameter parts.
Corrections to be added to Rockwell C, A and D values
Diameter of Convex Cylindrical Surfaces
Hardness
Reading
¼”
6.4mm
3/8”
10mm
½”
13mm
5/8”
16mm
¾”
19mm
7/8”
22mm
1”
25mm
1-1/4”
32mm
1-1/2”
38mm
Corrections to be added to Rockwell B, F and G values
Diameter of Convex Cylindrical Surfaces
Hardness
Reading
¼”
6.4mm
3/8”
10mm
½”
13mm
5/8”
16mm
¾”
19mm
7/8”
22mm
1”
25mm
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
6.0
5.5
5.0
4.0
3.5
3.0
2.5
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0.5
4.5
4.0
3.5
3.0
2.5
2.0
2.0
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0
3.5
3.0
2.5
2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0
2.5
2.5
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
2.0
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
1.5
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
0
1.5
1.0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0.5
0
0
0
0
1.0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
0
0
0
0
0
1.0
1.0
0.5
0.5
0.5
0.5
0.5
0
0
0
0
0
0
0
0
0
10
20
30
40
50
60
70
80
90
100
12.5
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.5
8.5
8.0
7.5
6.5
6.0
5.5
5.0
4.0
3.5
3.0
2.5
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
5.5
5.0
4.5
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.5
4.5
4.0
4.0
3.5
3.0
3.0
2.5
2.0
1.5
1.5
1.0
3.5
3.5
3.5
3.0
2.5
2.5
2.0
2.0
1.5
1.5
1.0
3.0
3.0
3.0
2.5
2.5
2.0
2.0
1.5
1.5
1.0
0.5