PITCH CIRCLE CHORDAL DISTANCE CALCULATION

Unit B Grovelands Estate, Longford Road, Exhall, Coventry CV7 9ND

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E-mail: ppickering@coventrytoolholders.co.uk | Web: ctl-

A Member of Coventry Engineering Group

PITCH CIRCLE CHORDAL DISTANCE CALCULATION

T

D

To obtain the chordal distance T the following formula is used:

T=DxC

where: D = diameter of the pitch circle

C = constant as given in tables

Number of

Holes

Constant

¡®C¡¯

Number of

Holes

Constant

¡®C¡¯

Number of

Holes

Constant

¡®C¡¯

Number of

Holes

Constant

¡®C¡¯

3

0.86603

10

0.30902

17

0.18375

24

0.13053

4

0.70711

11

0.28173

18

0.17365

25

0.12533

5

0.58779

12

0.25882

19

0.16459

26

0.12054

6

0.50000

13

0.23932

20

0.15643

27

0.11609

7

0.43388

14

0.22252

21

0.14904

28

0.11196

8

0.38268

15

0.20791

22

0.14231

29

0.10812

9

0.34202

16

0.19509

23

0.13617

30

0.10453

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