Shop Speeds and Feeds

Spindle RPM and feed rate from SFM and chipload by tool / material.

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Formula and source

RPM = (SFM × 3.82) / D_in. Feed rate IPM = RPM × chipload × flutes. SFM and chipload from engineering-practice tables keyed to material and tool-type.

Machinery's Handbook engineering-consensus values; tooling-manufacturer (Sandvik, Kennametal, Niagara) recommendations by name.

Audience

This tile is built for carpentry and the adjacent professions in the Carpentry and Construction group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.

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Posture

Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.