DatumLab

Fast offline calculators for threads, tolerances, speeds, feeds, units, and material references in the shop or at your desk.

DatumLab is a practical mechanical toolbox for machinists, CNC operators, mechanical designers, and shop-floor technicians. Use it to look up common thread data, calculate ISO fits, estimate speed and feed values, convert shop units, check material references, and save frequently used setups. Core tools work offline, so you can keep working at the machine, in the workshop, or during design review without depending on a network connection. Key tools: Thread calculator for metric, UNC, UNF, BSP, NPT, trapezoidal, and Heli-Coil references Tap drill, clearance hole, pitch, pitch diameter, and minor diameter lookup ISO tolerance and fit calculator for common hole and shaft zones Speed and feed calculations for milling, drilling, tapping, and turning Radial chip thinning and thread turning helpers Unit conversion for length, pressure, torque, speed, force, and mass Material references for common aluminum, steel, stainless, non-ferrous, and plastic materials Weight, bolt preload, and geometry helpers Favorites, recent calculations, custom tools, custom materials, and exportable reports DatumLab is designed for quick reference and setup planning. Values are reference starting points only. Always verify final machining parameters with your tool, machine, workholding, material, and supplier recommendations.