Sandvik Coromant Threading - Manual (Page 114)

114

apx
=
a
p
nap - 1 √

√

5. Technical reference
Formulas
Use the following formulas as a reference for successful thread
machining.
Thread turning formulas
Infeed
(Manual formulas, when not using the Sandvik Coromant calculator)
Δap = Radial infeed
X = Actual pass (in a series from 1 to nap)
a
p
= Total depth of thread + extra stock
nap = Number of passes
 =
1st pass = 0.3
2nd pass = 1
3rd and higher = x-1