Spacing Table


When laying out a number of holes and the like, on a pitch circle, the table below will ease the task.  
Multiply the pitch circle diameter by the chordal factor for the number of spaces required.

 
No. of Spaced
Divisions
Chordal Factor
3
 0.8660
4
 0.7071
5
 0.5878
6
 0.5000
7
 0.4339
8
 0.3827
9
 0.3420
10
 0.3090
11
 0.2817
12
 0.2588
13
 0.2393
14
 0.2225
15
 0.2070
16
 0.1951
17
 0.1838
18
 0.1736
19
 0.1646
20
 0.1564
21
 0.1490
No. of Spaced
Divisions
Chordal Factor
22
 0.1423
23
 0.1362
24
 0.1305
25
 0.1253
26
 0.1205
27
 0.1161
28
 0.1120
29
 0.1081
30
 0.1045
36
 0.0872
37
 0.0848
38
 0.0826
39
 0.0805
40
 0.0785
41
 0.0765
42
 0.0747
43
 0.0730
44
 0.0713
45
 0.0698
Index