TURNING FORMULAS AND NOMENCLATURE
Spindle speed, n (rpm)
3.82 x v c D
n =
a p
depth of cut
inches
Cutting speed, v c (ft / min)
D
workpiece diameter
inches
v c = .262 x D x n
f n
feed per revolution
inches
l m
machined length
inches
Feed rate, v f (in / min)
n
spindle speed
rev/min
v f = n x f n
inches 3 /min
Q
metal removal rate
t
machining time
minutes
Machining time, t (min)
v c
cutting speed
feet/min
l m v f
t
=
v f
feed rate
inches/min
Metal removal rate, Q (in 3 / min)
v c x a p x f n x 12
Q =
68
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