Free Resources & Tools

Calculators, reference charts, and guides for machinists, engineers, and shop owners. Built by an industry expert.

Calculators
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Metal Removal Rate
Calculate MRR for milling, turning, and drilling operations. Optimize feeds, speeds, and material removal.
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Triangle Calculator
Input any combination of sides and angles to solve the rest. Perfect for sine bar setups and shop math.
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Bolt Hole Pattern
Generate X/Y coordinates for circular bolt patterns. Set any number of holes, diameter, and rotation offset.
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Sine Plate / Compound Setup
Calculate gage block stack heights for single and compound sine plate setups. Includes compensation formulas.
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Coordinate Rotation
Rotate bolt patterns and coordinate systems. Useful for fixture setups and multi-axis work.
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Taper & Angle Calculator
Calculate TPF, TPI, included angle, and gage block stacks. Includes standard taper reference table (Morse, B&S, CAT, Jarno).
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Chamfer Calculator
Calculate chamfer dimensions from any two known values — width, depth, and angle. Includes common chamfer presets.
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Chip Load Calculator
Calculate chip load per tooth from feed rate, RPM, and flute count. Verify you're in the right range for your tool and material.
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Surface Finish Calculator
Estimate theoretical surface finish (Ra) from feed rate and tool nose radius. Covers turning and milling operations.
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Dovetail Calculator
Calculate dovetail dimensions — measurement over/between pins, slot width, and angle. Male and female dovetail support.
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Keyseat Calculator
Look up standard keyseat and keyway dimensions for shaft diameters. Includes depth, width, and tolerance data.
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Press Fit Calculator
Calculate interference fit pressures, stresses, and required press force for shaft and hub assemblies.
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Drill Point Calculator
Calculate drill point depth from diameter and point angle. Covers standard 118°, 135°, and custom angles.
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ISO Fits & Tolerances
Select nominal size and tolerance classes to get min/max dimensions, clearance, or interference. Covers H7/g6, H7/p6, and more.
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Unit Conversion
Convert between inches, millimeters, and fractional sizes in real-time. Auto-updates as you type with 4-decimal precision.
Reference Charts & Data
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Speeds & Feeds Lookup
Searchable SFM data for common materials. Includes RPM and feed rate calculator with chip load.
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Thread & Tap Drill Charts
UNC, UNF, Metric, and NPT thread data. Includes form tap drill sizes for all major thread standards.
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Material Properties
Machinability ratings, hardness conversions, and material reference data for common alloys.
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GD&T Quick Reference
Geometric dimensioning and tolerancing symbols, feature control frames, datum references, and modifiers.
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G & M-Code Reference
Complete G-code and M-code reference for Fanuc, Haas, and common CNC controls. Searchable with descriptions and examples.
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Decimal Equivalents Chart
230+ entries covering number drills, letter drills, and fractional sizes. Sorted by size, filterable, and searchable.
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Wire Gauge Reference
AWG, SWG, and metric wire gauge sizes with decimal equivalents, diameters, and cross-sectional areas.
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Hardness Converter
Convert between Rockwell (HRC/HRB), Brinell (HB), Vickers (HV), and tensile strength. Bidirectional lookup.
Guides & Learning
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HSS vs Carbide Guide
When to use each, coatings, grades, and a practical decision framework for tooling selection.
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Shop Dictionary
Plain-language glossary of machining terms. Searchable, with 50+ entries for apprentices and experienced machinists.
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Cost Estimation Guide
How shops calculate per-part costs. Covers cycle time, shop rate, tooling, material, and common mistakes.
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Abrasives Reference Guide
Disc types, grain comparisons, grit charts, bond types, and a material selection matrix for grinding and finishing.