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ToolSpecVaultDRO
Tools

All machinist calculators & charts

All 61 ToolSpecVault calculators and charts, grouped into seven drawers by shop task: threads and taps, holes and fits, fasteners and torque, metrology, CNC speeds and feeds, gears and sheet metal, and general workshop reference. Open a drawer to see every tool in it with a one-line summary, or press Ctrl K on any page to jump straight to a tool by name.

Seven drawers

Threads & Taps19 toolsHoles, Fits & Tolerances6 toolsFasteners & Torque11 toolsMetrology & Inspection7 toolsCNC, Speeds & Feeds11 toolsGears, Sheet Metal & Materials4 toolsWorkshop Reference3 tools

Threads & Taps

29° Acme Thread Dimensions CalculatorCalculate 29-degree ASME B1.5 General Purpose and B1.8 Stub Acme thread dimensions, pitch diameter, minor core diameter, tool tip flat width, and 3-wire MOW.Open BSPP & BSPT British Pipe Tap Drill ChartComplete BSPP and BSPT 55° Whitworth British pipe thread tap drill chart and dimensions calculator.Open Blind Hole Tap Depth CalculatorBlind hole tap depth calculator for CNC machinists.Open Buttress Thread Dimensions CalculatorCalculate ASME B1.9 and DIN 513 Buttress thread dimensions, pitch diameter, root radius, and 3-wire measurement.Open CNC Thread Milling CalculatorUniversal CNC thread milling calculator. Computes internal and external centerline feed rate compensation, spindle RPM, and G02/G03 helical interpolation G-code.Open Fanuc G76 Threading Cycle CalculatorCalculate Fanuc 2-line and Haas 1-line G76 threading cycle parameters, minor core diameter X, integer micron P and Q words, and constant-volume pass depths.Open G84 Rigid Tapping Feed Rate CalculatorPrecision G84 rigid tapping feed rate and spindle speed calculator.Open Helicoil Tap Drill ChartHelicoil tap drill chart for metric and Unified threads.Open ISO Metric Trapezoidal Thread Calculator (DIN 103 Tr)Calculate ISO 2901, ISO 2903, and DIN 103 Metric 30° Trapezoidal screw thread pitch diameter, minor diameter, 7e/7H tolerances, and 3-wire MOW readings.Open Lathe Taper Per Foot (TPF) to Degrees CalculatorConvert lathe Taper Per Foot and Taper Per Inch into included taper angle, compound rest half-angle, and tailstock set-over offset.Open Master Tap Drill ChartExhaustive tap drill sizing chart for Unified UNC/UNF and ISO Metric coarse and fine threads.Open Metric Tap Drill ChartMetric tap drill chart covering ISO coarse and fine pitch threads from M1.6 to M36.Open Morse Taper Dimensions Chart (MT0 to MT7)Official ISO 296, DIN 228, and ASME B5.10 Morse Taper dimensions chart for MT0, MT1, MT2, MT3, MT4, MT5, MT6, and MT7 shanks and sockets with interactive calculator.Open NPT Pipe Tap Drill ChartNPT pipe tap drill chart covering 1/16-inch to 2-inch NPT.Open Roll Form Tap Drill ChartRoll form tap drill chart for metric and Unified threads.Open Spiral Point (Gun Tap) vs. Spiral Flute Tap Chart & Selection GuideCompare Spiral Point vs. Spiral Flute taps across DIN 2181 chamfer forms, helix angles, chip evacuation, and blind-hole clearance.Open Thread Engagement Tap Drill CalculatorThread engagement tap drill calculator and shear strength guide.Open Three-Wire Thread Measurement CalculatorMaster three-wire thread measurement calculator for 60° Unified/Metric, 29° Acme, and 55° Whitworth threads.Open Unified Thread Class 2A/2B vs 3A/3B Tolerance Calculator (ASME B1.1)Calculate ASME B1.1 Unified inch screw thread Class 1A, 2A, 3A and 1B, 2B, 3B pitch diameter limits, plating allowance, and major/minor tolerances.Open

Holes, Fits & Tolerances

AS568 O-Ring Groove Dimensions Chart & Gland Calculator (Face & Piston)Complete SAE AS568 O-ring groove dimensions chart and gland calculator for static face, radial piston, and rod seals.Open Clearance Hole ChartClearance hole chart for metric and Unified bolts.Open GD&T True Position CalculatorMaster GD&T true position calculator with Maximum Material Condition and LMC bonus tolerance.Open ISO 286 Hole & Shaft Tolerance CalculatorInteractive ISO 286-1/2 hole and shaft limits and fits calculator.Open Machining Thermal Expansion CalculatorCalculate linear thermal expansion in CNC machining, differential micrometer error vs 20°C ISO 1 reference, and warm-cut target offsets.Open Shaft Press-Fit Interference Stress & Tonnage Calculator (Lamé)Interactive shaft and hub press-fit interference calculator.Open

Fasteners & Torque

ANSI B17.1 Keyway Dimensions Chart & Shaft Depth Calculator (h_c)Complete ANSI B17.1 inch and DIN 6885 metric keyway dimensions chart and calculator.Open ANSI B17.2 Woodruff Key & Keyseat Dimensions Calculator (+ DIN 6888)Decode ANSI B17.2 Woodruff key numbers, and calculate shaft keyseat depth B, arc crown allowance, milling cutter plunge depth, and DIN 6888 specs.Open ASME B18.6.3 Flat Head Screw Countersink Chart & Z-Plunge CalculatorComplete ASME B18.6.3 82° and aerospace 100° flat head screw dimensions chart and CNC countersink Z-plunge depth calculator from surface or pilot hole lip.Open CNC Countersink Depth CalculatorCalculate exact CNC countersink and chamfer mill Z-axis plunge depth for 60°, 82°, 90°, 100°, 118°, and 120° tools with non-zero tool tip flat compensation.Open Countersink Angle & Diameter ChartCountersink angle and diameter chart. 82° ASME vs 90° ISO vs 100° aerospace vs 120° deburr angles, depth formulas, and flush seating specs for flat head screws.Open Dowel Pin Reamer Chart & Tolerance CalculatorComplete ASME B18.8.2 and ISO 8734 dowel pin press-fit and slip-fit reamer hole tolerance chart, with interactive interference and clearance calculator.Open ER Collet Clamping Range & Nut Torque ChartMaster DIN 6499 / ISO 15488 ER collet chart.Open Machinist Bolt Circle CalculatorInteractive machinist bolt circle calculator.Open Master Bolt Torque ChartMaster bolt torque chart for SAE Grade 2/5/8 and Metric Class 8.8/10.9/12.9 fasteners.Open Retaining Ring Groove Dimensions ChartInteractive internal and external retaining ring groove dimensions chart and thrust load calculator for DIN 471, DIN 472, and ANSI B27.7.Open Socket Head Cap Screw Counterbore ChartComplete socket head cap screw counterbore chart and calculator for ASME B18.3 inch and ISO 4762 metric fasteners with washer depths.Open

Metrology & Inspection

3-Point Circle Center & Diameter CalculatorCalculate exact circle center coordinates, radius, and ruby stylus ball-compensated bore/boss diameter from 3 probed points.Open Dovetail Measurement Over Pins CalculatorInteractive dovetail measurement over and between gage pins calculator for 45°, 50°, 55°, and 60° male slides and female ways.Open Hardness Conversion Chart & CalculatorOfficial ASTM E140 and ISO 18265 metal hardness conversion chart and calculator between Rockwell C, Brinell, Vickers, HRA, and Tensile Strength.Open Johansson Gage Block Stack CalculatorCalculate the exact minimum-block wringing stack from an 81-piece inch or 88-piece metric Johansson gage block set with wear block support.Open Machinist Sine Bar CalculatorInteractive machinist sine bar and sine plate calculator.Open Surface Finish Ra to Rz ConverterInteractive surface finish Ra to Rz and RMS/Rq converter.Open V-Block Cylinder Center Height CalculatorCalculate cylinder centerline height and top crest height above the V-vertex, V-block top flat, and granite surface plate.Open

CNC, Speeds & Feeds

Ball Nose End Mill Scallop Height & Stepover Calculator (3D CNC)Interactive 3D CNC ball nose end mill scallop cusp height and radial stepover calculator.Open Boring Bar Deflection CalculatorCalculate cantilever boring bar radial tip deflection, area moment of inertia, bore taper error, and maximum chatter-free L/D overhang ratio.Open Bull-Nose (Corner Radius) End Mill Effective Diameter & Scallop CalculatorCalculate bull-nose end mill effective cutting diameter, flat floor wiper width, compensated spindle RPM, and 3D cusp height.Open CNC Coolant Refractometer Brix Concentration & Sump Top-Up CalculatorCalculate true CNC cutting fluid concentration from optical refractometer Brix and exact gallons/liters of neat concentrate and water needed for sump top-up.Open CNC Lathe G96 Constant Surface Speed (CSS) & G50 Spindle Clamp CalculatorCalculate CNC lathe G96 Constant Surface Speed spindle RPM across diameters, critical G50/G92 clamp diameter, facing cycle time, and Fanuc/Haas G-code.Open CNC Milling Material Removal Rate (MRR) & Spindle Horsepower CalculatorCalculate CNC milling Material Removal Rate, Kienzle specific cutting force, net/gross spindle horsepower, and spindle torque.Open CNC Peck Drilling Cycle CalculatorCalculate optimal peck drilling depth, variable peck reduction, feed rate, and ready-to-run Fanuc/Haas G83 deep-hole vs G73 chip-break G-code.Open Drill Press RPM ChartDrill press RPM chart and cutting speed guide.Open Fanuc Custom Macro B System Variables ChartMaster Fanuc 0i/31i & Haas NGC Custom Macro B chart: #1–#33 G65 arguments, #100/#500 variables, #5221–#5324 G54–G59 work offsets, #10001 tool offsets, and #3000 alarms.Open Lathe Knurling Blank Diameter & Pitch CalculatorCalculate lathe knurling blank diameter and exact tooth-tracking circumference under DIN 82.Open Radial Chip Thinning CalculatorCalculate exact Radial Chip Thinning Factor, Axial Lead Angle Chip Thinning, and compensated CNC milling feed rates for High-Efficiency Milling.Open

Gears, Sheet Metal & Materials

Milling Machine Table T-Slot Dimensions Chart (DIN 650, ISO 299 & ASME B5.1M)Official DIN 650, ISO 299, DIN 508, and ASME B5.1M milling machine table T-slot and T-nut dimensions chart with interactive calculator.Open Sheet Metal Bend Allowance, K-Factor & Bend Deduction CalculatorCalculate sheet metal bend allowance, K-factor, outside setback, bend deduction, flat pattern blank length, and press brake V-die tonnage.Open Sheet Metal Punch Tonnage CalculatorCalculate sheet metal hole punching and blanking tonnage, stripping force, and punch-to-die clearance for steel, stainless, and aluminum.Open Spur Gear Module & Diametral Pitch CalculatorConvert between metric gear Module and imperial Diametral Pitch, and calculate pitch diameter, blank OD, root diameter, and span over k teeth.Open

Workshop Reference

4-Way Drill Bit Size Converter4-way drill bit size converter and comparative chart.Open Drill Point Length CalculatorCalculate twist drill and solid carbide drill point cone length) for 90°, 118°, 130°, 135°, and 140° angles, plus blind and through-hole Z-depths.Open Interactive Studio (all instruments)DRO studio with every instrument on one screen: 60 FPS CNC simulation, G-code and blueprint export.Open