Machining calculators

Spindle speed from cutting speed and tool diameter, feed rate from feed per tooth or per revolution. Everything is calculated in your browser, and nothing you enter is sent anywhere.

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Nothing gets sent!

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ISO fits

Limit deviations, clearance and interference from the nominal size and hole/shaft tolerance classes (H7, g6 and more).

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Metric thread tables

Coarse and fine metric threads: pitch, pitch diameter, minor diameter and tap drill sizes.

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Turning

Spindle speed, feed rate and cutting time for OD turning, plus the theoretical surface roughness from feed and nose radius.

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Milling

Spindle speed, table feed, feed per revolution and cutting time for face mills and end mills.

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Drilling

Spindle speed, feed rate and cutting time per hole for twist drills.

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Tapping

Spindle speed and feed rate for tapping. The feed rate is pitch × RPM (rigid / synchronous tapping).

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Thread dimensions

From the nominal diameter and pitch: the fundamental triangle height, pitch diameter, minor diameter (basic internal minor diameter) and a guide tap drill size for cutting taps.

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Taper

From the large diameter, small diameter and length: taper ratio (1:x), included angle, and half angle (the angle to set the lathe compound rest).

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Reaming

Spindle speed, feed rate and cutting time for finishing holes with a reamer.

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Boring

Spindle speed, feed rate, cutting time and theoretical roughness for ID boring. Enter the finished hole diameter.

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At shallow depths a ball end mill cuts on a diameter smaller than the tool diameter (effective diameter). This calculates RPM from the effective diameter and the scallop (cusp) height from the stepover.

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