Page 316 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair

Appendix 6-A

Helical Gear Formulae, Standard

Gearing

d+D
N+n
1. cos JI = - 8.C- -
2P c 2
n
n 2c a +b
2. d = E 9. ht = c c
P cos JI m +1 P
n G n
N 2C m tdn
3. D = = G 10. Vt = J
P cos q.J m +1 12
n G
126000 Psc
2a 11. w =
C t
4. d =d+- n d
0 P
P
n W tan 0,
2a 12. w, = t
5. D ED+- C cos JI
0
'n
l3. w =w tanV
2b x t
C
6. dR=d-- 14. m = -
N
' n G
n
7. DR= D -- 2b 15. tan Q = tan @ n
C
t cos Y
' n

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