CNC Machinist CalculatorFree machining calculators for speeds, feeds, tolerances, and moreCutting Speed Calculator — Convert between SFM, m/min and RPM for any tool diameterFeed Rate Calculator — Calculate feed rate (IPM/mm/min) from RPM, chip load, and flute countMachining Time Calculator — Estimate milling, turning, and drilling cycle timesTap Drill Size Calculator — Look up recommended tap drill for Unified (UNC/UNF) and Metric threadsTap Drill Size Chart — Complete UNC, UNF, and Metric tap drill size reference table with searchThread Calculator — Calculate pitch diameter, minor diameter, and thread depthHardness Converter — Convert between Rockwell, Brinell, Vickers and Shore hardness scalesMetal Weight Calculator — Calculate stock weight for round, square, flat, hex, tube, angle, and channel shapesBolt Circle / Hole Pattern — Calculate X,Y coordinates for equally-spaced holes on a bolt circleTrue Position Calculator — Calculate GD&T true position and check against tolerance zoneLathe Speeds & Feeds — Turning, facing, and parting RPM and feed recommendations by materialISO Fit & Tolerance Calculator — Calculate hole and shaft tolerances per ISO 286 standardGear Ratio Calculator — Calculate gear ratio, output speed and torque for single or multi-stage gear trainsDrilling Speeds & Feeds — Calculate RPM, feed rate, and surface speed for drilling by material and tooling typeTapping Calculator — Calculate tapping RPM and rigid tapping feed rate for CNC G84 cycleBolt Torque Calculator — Tightening torque for SAE Grade 2/5/8 and Metric 8.8/10.9/12.9 boltsClamping Force Calculator — Calculate required clamping force from projected area and cavity pressureCooling Time Calculator — Estimate cooling time from wall thickness and material thermal propertiesShrinkage Calculator — Calculate mold dimensions accounting for plastic shrinkage ratesShot Size Calculator — Calculate shot weight, volume, and hourly outputHold Time Calculator — Estimate packing/hold time based on cooling time and gate freeze-offRunner Design Calculator — Calculate runner diameter from part weight and runner lengthCycle Time Calculator — Calculate total cycle time from injection, pack, cooling, and open/close timesBelt Length Calculator — Calculate open and cross belt length from pulley diameters and center distanceChain Length Calculator — Calculate chain length in pitches from sprocket teeth and center distancePulley RPM Calculator — Calculate driven pulley speed and belt velocity from pulley diameters and driver RPMLead Screw Calculator — Calculate linear speed, travel per revolution, and travel time for lead screwsBearing Life (L10) Calculator — Calculate L10 bearing life in hours from dynamic load rating and equivalent loadThread Stripping Strength Calculator — Calculate thread stripping shear area and strip load for UNC and Metric threadsTensile Stress Area Calculator — Calculate thread tensile stress area and proof load for UNC and Metric fastenersGear Geometry Calculator — Calculate pitch, base, outside, and root diameters, center distance, and undercut check for involute spur gearsSpring Calculator — Helical compression/extension and torsion springs: index, Wahl factor, spring rate, shear stress, buckling checkTribology Calculator — Viscosity index, grease relubrication interval, and bearing friction torque in one toolWelding Calculator — Arc heat input (kJ/mm) and fillet weld shear stress / throat / required leg length in one tool