Beta: metal milling. Every number is sourced from the tool manufacturer's published data and linked to its source. Rows marked ⚠ carry a note about that row. Starting points only: verify against your tool's own chart.
Metal calculator
Results
RPM = 3.82 × SFM ÷ D and IPM = RPM × flutes × IPT (Harvey Tool). SFM defaults to the low end of a published range. If your spindle can't reach the RPM, the calculator caps it, keeps the published IPT and recalculates the feed, so the effective SFM drops. Diameter comes from the published row, so no values are interpolated.