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CNC Calculator

RPM, cutting speed, feed rate and conversions

RPM (spindle speed)

n = (Vc × 1000) / (π × D)

Spindle
1,273RPM

Cutting speed

Vc = (π × D × n) / 1000

Vc
188.5m/min

Table feed (Vf) — mill

Vf = fz × Z × n

Vf
480mm/min
fn (per rev)
0.400mm/rev

Machining time

t = L / Vf

Time
0.33min

mm ↔ inch conversion

1 in = 25.4 mm