Practical guides on involute gear geometry, parameter selection, and file export for CNC, laser cutting, and CAD.
Internal gears power every planetary gearbox, yet few free tools can draw one. A complete guide to ring gear geometry, the Fellow pinion-cutter method with Willis kinematics, cutter tooth-count selection, the three types of interference (involute, trochoid, trimming), and exporting accurate SVG and DXF ring gears for CAD, CNC, and 3D printing.
Read article →A thorough walkthrough of every parameter in an involute spur gear — module, number of teeth, pressure angle, addendum/dedendum coefficients, and profile shift — with step-by-step instructions for exporting production-ready files using GearProfile.app.
Read article →A practical guide to selecting gear module and pressure angle for spur gears. Covers the ISO 54 standard module series, contact ratio, application-specific tables for 3D printing, laser cutting, and CNC milling, and why 20° is the universal default.
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