Milling machines - Feed rate calculations
 
Feed rate
Feed rate is defined as tool's distance travelled during one spindle revolution. Feed rate and cutting speed determine the rate of material removal, power requirements, and surface finish.
 
Formula

Feed Calculator

Calculation examples

Example 1

A milling cutter is 20 mm in diameter and has FOUR teeth. The cutting speed for the material is given as 10 m/min and the feed is 0,04 mm per tooth.
Calculate the feed in mm/min.

HINT : S = π ?D ?N and f = fƗ ?T ?N

S  = π ?D ?N
N  = S/π ?D
    = 10/ π ?0,02
    = 159,2 r/min

f   = fƗ ?T ?N
    = 0,04 ?4 ?159,2
    = 25,5 mm/min

 

 

 Example 2

A milling cutter is 25 mm in diameter and has 4 teeth. The cutting speed for the material is given as 45 m/min and a feed of 0,18 mm per tooth.
Calculate the feed rate in mm/min.

(Hint: S = π ?D ?N and f = fƗ ?T ?N)

D  = 25 mm = 0,025 m
S  = 45 m/min
T = 4 teeth
ft  = 0,18

S = π ?D ?N
N = S/π ?D
    = 45/π ?0,025
    = 572,958 r/min

f   = fƗ ?T ?N
    = 0,18 ?4 ?572,958
    = 412,53 mm/min

 Example 3

A milling cutter is 12 mm in diameter and has two teeth. The cutting speed for the material is given as 25 m/min with a feed of 0,18 mm per tooth.
Calculate the feed in mm/min.

(HINT: S = π ?D ?N and f = fƗ ?T ?N)

S  = π ?D ?N
N  = S/π ?D
    = 25/π ?0,012
    = 663,146 r/min

f  = fƗ?T ?N
   = 0,18 ?2 ?663,146
   = 238,732 mm/min