This lathe cutting time calculator finds the machining time for a turning or boring pass from the cut length, feed rate, and spindle speed. Enter the values above.
Formulas
Time T = L ÷ (f × N) Spindle speed N = 1000 × Vc ÷ (π × D)
- L — cut length, f — feed per rev, N — rpm, Vc — cutting speed, D — diameter
Example
L = 100 mm, f = 0.2 mm/rev, N = 500 rpm: T = 100 ÷ (0.2 × 500) = 1.0 min.
Related calculators
Frequently Asked Questions
How do I calculate lathe cutting time?
Divide the cut length by the product of feed per revolution and spindle speed: T = L / (f x N).
How do I find spindle speed from cutting speed?
Use N = 1000 x Vc / (pi x D), with cutting speed in m/min and diameter in mm.
Does this cover multiple passes?
It gives time per pass. Multiply by the number of passes for the total roughing and finishing time.