Machinist screenshots
What Machinist does
Speeds & feeds
Mill, drill or lathe, 30 materials, HSS or carbide. Type the diameter and get RPM and feed rate as you type, with chip thinning for light radial cuts and a spindle-max cap. Inch (SFM, IPM) or metric (m/min, mm/min), one tap apart.
Shop calculator
Fractions the way you write them: 1 3/4 + 1/8 = 1.875. Sin, cos, tan and their inverses in degrees, square roots, powers and π. Every answer also shows in millimetres or inches and as the nearest 64th.
Tap drills & threads
Every UNC, UNF and metric coarse and fine size at any % of thread, with pitch and minor diameters. Tap drills for helical wire thread inserts (STI), and NPT, G (BSPP) and R (BSPT) pipe threads.
G & M codes
Mill and lathe G codes and the common M codes, searchable by number or by what they do.
ISO fits & tolerances
H7/g6, H7/p6 and the rest: hole and shaft limits up to 500 mm, the clearance or interference, and the fit type.
Surface finish
The Ra and Rz a nose radius and feed leave, the N grade, Ra in µin and µm, and the largest feed that still meets the finish on the print.
Drill chart & converter
Fraction, decimal and mm both ways, the nearest 64th, 32nd and 16th, and the full number, letter, fractional and metric drill chart.
Bolt circle & right triangle
Hole coordinates for any pattern, with a drawing to check against the print. Any two values solve a right triangle.
Favorites & recent jobs
Every calculation is kept. Star the ones you run often.
Free and Pro
Free: speeds and feeds for 6061 aluminium, 1018 steel and 304 stainless, the shop calculator, G & M codes and the drill chart. Machinist Pro adds all 30 materials, tap drills and threads, ISO fits, surface finish, bolt circles, triangles, favorites and the iPad layout.