Machining Time Calculator

Machining Time Formula

Worked Example

Turning a 50 mm bar at 500 rpm, 0.2 mm/rev, 2 mm depth over 200 mm:

1. V = πDN/1000 = π × 50 × 500 ÷ 1000 = 78.5398 m/min
2. MRR = V f d = 31415.9 mm³/min
3. t = (L + approach) ÷ feed rate = 200 ÷ 100 = 2 min

Feed rate: 100 mm/min · Material removal rate: 31415.9 mm³/min · Material removal rate: 31.4159 cm³/min · Machining time: 120 s

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Frequently asked questions

Sources

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.