Diameter of the tool

D - [mm]

Cutting speed

        D x π x n
vc = -------------           [m/min]
          1000

Number of revolutions

        vc x 1000
n = ------------            [1/min]
         D x π

Scroll

s = fr x n               [mm/min]

Feed per revolution

          s
fr = -------                   [mm/r]
          n