Machinist Calc

Choose a material and cutter, enter your machine's RPM limit, and calculate spindle speed and feed rate. Enter exact inch, metric or fractional cutter sizes, use your tool manufacturer's cutting data, and save setups for later. When spindle speed is limited, feed adjusts to preserve feed per tooth. Optional radial chip thinning shows programmed feed per tooth and target chip thickness.

The Tap Drill tab includes common metric, UNC and UNF threads. Choose a target engagement from 50% to 100%, then see the calculated diameter, nearest catalog drill and its actual engagement. The catalog includes inch and metric drills. Calculations cover 60-degree cutting taps.

Calculations and saved setups stay on your device. You do not need an account or sign-in. The app uses RevenueCat for purchases and TelemetryDeck for usage analytics. See the Privacy Policy for details.

Starting points, not guarantees: published speeds and feeds vary widely between tool vendors, and the right numbers for your cut depend on rigidity, work holding, coolant, tool coating and stick-out. Machinist Calc gives deliberately conservative starting values — verify them against your tooling manufacturer's data, start light, and listen to the cut. Machining is dangerous work: no calculator replaces guarding, eye protection, and your own judgement at the machine.

Support: luka911a@gmail.com