RPM · IPM · SFM · Ra
Machining math, done right.
Speeds, feeds, threads, and shop math for lathes and mills — manual through multi-axis. Inch and metric. Free, fast, and it works with no signal on the shop floor.
Tools
Speeds & feeds
- LatheTurning speeds & feedsMaterial, insert and setup to speed, feed, DOC, RPM and G-code.
- MillMilling speeds & feedsEnd mill, material and cut to RPM, chip load and IPM, with chip thinning.
- Lathe · MillThreads & tap drillsTap drill at the right % of thread, nearest drills, 3-wire, tapping RPM.
- LatheKnurlingThe blank Ø that tracks, form growth, tooth depth, speeds and feeds.
- Lathe · MillDrilling & peck cyclesDrill, material and depth to RPM, feed, G81/G73/G83 and Z past the point.
- Lathe · MillSpindle speedSFM or m/min to RPM, capped at your machine.
Fix a problem
Shop math
- MillBolt circleEvery hole’s X and Y, the chord between holes, and a G81 program.
- Shop mathRight triangle solverAny two sides, or a side and an angle, to the rest. Degrees, minutes and seconds.
- InspectionSine barGauge block stack for an angle on a 5" or 100 mm bar, or the angle a stack sets.
- LatheTaperTaper per foot, included angle and compound setting; small end from an angle; tailstock offset.
- MaterialsHardness conversionHRC, HRB, Brinell and Vickers for steel, from the ASTM E140 tables.
- Lathe · MillFits & tolerancesISO hole and shaft limits for H7/g6, H7/p6 and the other common fits, to 500 mm.