Engineering tools

The references you reach for
on the floor.

Calculators, charts, and visualizers for machinists and manufacturing engineers. No account, no ads, nothing to install.

Calculator

Feeds & Speeds

Spindle speed, feed rate, and material removal rate for milling.

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Reference

Thread & Tap Drill

Tap drill and clearance sizes for UNC, UNF, and metric threads.

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Calculator

ISO Tolerance Fits

Shaft and hole fits, clearance, and interference per ISO 286.

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Calculator

Drill & Tap Speeds

RPM and feed for drilling and rigid tapping by material.

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Calculator

Weight & Material

Stock weight for plate, round, and tube in common alloys.

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Reference

Hardness Converter

HRC, HB, HV, and tensile strength conversions for steels.

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Reference

Surface Finish

Ra and Rz conversions and process-to-finish references.

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Visualizer

G-Code Viewer

Paste or upload G-code and preview the toolpath top-down.

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Visualizer

Revolve Visualizer

Preview a turned part from a 2D profile.

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Values are references for planning. Verify against your tooling and machine documentation before cutting.