Estimate theoretical surface roughness from feed and tool nose radius. Use it to compare finishing parameters before turning, boring, or milling a critical surface.
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Request a Proposal →The calculated value is ideal geometry. Actual measured roughness can be worse if chatter, built-up edge, or tool wear is present.
Feed, nose radius, tool sharpness, vibration, material behavior, coolant, machine rigidity, and tool wear all affect the measured finish.
Reduce feed, increase nose radius where geometry allows, improve rigidity, use a sharp finishing edge, and remove chatter.
No. It is a theoretical estimate. Real surface roughness must be measured with proper inspection equipment.
Use this calculator to estimate theoretical Ra and compare finishing feeds before turning, boring, or milling a critical surface.
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Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.