Calculation Formulas - Indexable Milling

Speed-Spindle Rotation (rpm)

Vc x 1000

n = π

Dc x

Cutting Speed (m/min.)

D xπxn

c

Vc =

1000

Feed Rate (mm/min.)

Vf = fzxZxn

Feed Per Tooth (mm/z)

Vf

fz =

Z x n

Feed Per Revolution (mm/rev.)

fn = fz x Z

Metal Removal Rate (cm /min.)

3

a x a x V

epf
Q =
1000
Medium Chip Thickness
ae
h = f xorf = hx
mz Dzm

c

Dc

a

e

fz

hm Vf h

Terminology

nSpindle speedrpm
DCutting diametermm
c
apCut depthmm
aeCut widthmm
ZNo. of teeth
VcCutting speedm/min
VfFeed ratemm/min
fzFeed per toothmm/Z
fnFeed per revolutionmm/rev.
QMetal removal ratecm3/min
hmMedium chip thicknessmm
πPi Symbol (3.1416)pi