Feedmark

About

Feedmark is a calculator for CNC machinists and hobby mill owners. Pick a material, a tool and a machine, and it gives you spindle speed and feed at once, capped to what your machine can do.

Speeds And Feeds

Milling, drilling, tapping and turning. RPM, feed rate, chip load, surface speed, metal removal rate and spindle power. Radial chip thinning and ball nose effective diameter are applied for you. A tachometer shows how close you are to the machine's top speed.

See The Math

Tap the RPM to see every formula with your numbers in it. Nothing is hidden.

Your Shop, Your Numbers

The starting materials use conservative values to begin with. Edit any of them, or add your own materials, tools, machines and drills. Your changes stay on your iPhone.

Threads And Drills

UNC, UNF, metric coarse and metric fine. Tap drill for cut and forming taps at the thread percent you choose, the closest fractional or metric drill and the thread it leaves, plus pitch and minor diameters.

Shop Tools

Thread milling program with helical G-code you can copy, bolt hole circle, true position with MMC bonus, right triangle, ball nose scallop height, gauge block stacks and unit conversions.

G And M Codes

Common codes for mill and lathe in plain words, with examples. Search "G83" or "coolant".

Widget And Voice

A widget shows the last job's RPM and feed. Say "Spindle speed in Feedmark" or "Tap drill in Feedmark" to get the answer without opening the app.

Private And Offline

No account, no ads, no tracking. Works in the shop without a signal.

Bought Once, Yours For Good

No monthly fee and nothing to unlock later. Every calculator comes with the app.

Cutting values are starting points. Check your tool maker's data and adjust for your machine and setup.