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Free calculators for lathe operators

The calculations you actually reach for on the shop floor, straight in the browser. No sign-up, works on a phone.
The maths is the same engine that drives LATHE-NC.

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Tool nose radius compensation

Programmed X/Z coordinates and the offset for chamfers, tapers and corner radii. Stop working out "0.47 for an R0.8" on a calculator every time.

Open the calculator →
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Surface speed and RPM

RPM, feed rate and cycle time from cutting speed and diameter, with starting speeds by material. Metric or SFM / inch.

Open the calculator →
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Taper calculator

Taper angle and ratio from the large and small diameters and the length, plus the diameter at any position. mm or inch, with taper per foot.

Open the calculator →

Want a calculator that is not here? Tell me on X (@lathe_nc_works).

LATHE-NC does all of this for you.

TURNINGFree beta ▶ Click to see how to use it (video)
Demo: PDF drawing → operations placed automatically → pass calculation → G-code → 3D simulation (22 s)
MILLComing soon LATHE-NC MILL demo
Demo: PDF drawing → hole operations set automatically → NC → 3D simulation (25 s). PDF reading covers holes; pockets come from STEP. The parts in the video are samples made for this demo.
See LATHE-NC