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CNC Speeds & Feeds, Demystified

RPM, chip load, tool life and surface finish — the handbook math every machinist uses, free.

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Spindle Speed Calculator — Aluminum 6061

Carbide starting RPM for milling Aluminum 6061: n = 1000·Vc/(π·D) with a handbook cutting speed preset.

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Feed Rate & Chip Load — Mild Steel 1018

Table feed vf = n·z·fz for milling Mild Steel 1018, preset with a handbook chip load per tooth.

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MRR & Cutting Power — Aluminum 6061

Material removal rate and spindle power for milling Aluminum 6061 using its specific cutting force kc.

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Taylor Tool Life — Uncoated Carbide on Steel

Predicted minutes of tool life from cutting speed via V·Tⁿ = C, preset for uncoated carbide on steel.

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Drilling Speed & Feed — Stainless 304

HSS drill RPM, feed and time-per-hole for Stainless 304 from handbook cutting data.

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Surface Finish Predictor — Finish Turning Steel

Theoretical Ra and Rt from feed and nose radius for finish turning steel, checked against a Ra 1.6 target.

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