TURNMATE / Surface finish
Turning surface finish estimator
Estimate ideal geometric Ra and Rz from feed per revolution and tool nose radius. Calculations run locally in your browser. Keep units consistent; results are for geometry or unit checks.
Formula and scope
Ideal tool-nose geometry: Ra = f²/(32r), Rz ≈ f²/(8r). With f and r in mm, results are multiplied by 1000 for µm. Actual finish depends on material, insert, vibration, built-up edge, coolant, and machine condition.
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