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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