GearForge designs involute gears and drives, checks how every pair will run, and exports print files, STEP, drawings and parametric CAD scripts in one click.
One 20 MB program for Windows 10 and 11. Nothing to install.
Pick a type or one of about 30 presets, edit the numbers, and watch the parts turn at their real ratios.
One gear or a compound stack, spur, helical or herringbone, with up to two mating gears in mesh.
Teeth on the inside of a rim, spur, helical or herringbone.
Straight or helical, with a solid back.
Straight bevels for any shaft angle, sized from the mating gear.
1 to 8 starts, with a wheel cut the way its worm would cut it.
Sun, planets and ring, phased so every planet meshes.
GT2 and HTD, flanges and hub, and a drive sized from the belt length.
ISO 606 teeth for standard roller chains, with chamfered sides.
Lobed discs, pins, eccentric cam and output carrier, worked out exactly.
A slotted wheel that turns one slot per turn of its crank, locked in between.
A wheel that turns one way only, with a pawl shaped to sit in its teeth.
A mating gear on a shaft crossing the stack's, 90° or any angle down to 10°.
Every meshing pair gets a verdict, runs smoothly, runs roughly or won't run properly, with what to change.
Contact ratio, backlash and root clearance at the centre distance the parts are really built at, counting only true involute contact.
Rolling check: the real tooth outlines, root fillets and all, are rolled through mesh to catch tip interference the formulas miss.
Stepped through mesh: the play at every step and where the driven gear sits against the ratio, plotted for each pair.
Strength guide: the tooth load and torque each gear should carry before its teeth bend, in the material you print.
Grow every hole by what your printer closes up, and pull in the squashed first layer, in the print files only.
Chamfer tooth edges so gears slide into mesh, and fillet or chamfer the joints between stages.
Teeth and pitch, or your own text, cut into a face round the bore, mirrored to read right on a bottom face.
Two plates on pillars holding every shaft at its centre distance, with bearing pockets from 683 to 6804.
A test print of numbered gear pairs at several backlash values, to tune your printer once.
Measure it with calipers, or trace a scan or photo, and GearForge finds the module or DP, pressure angle and shift.
Print files, CAD, drawings and a spec sheet, written together into the folder you pick.
The Inventor rule builds the gear natively with real involute curves, driven by named parameters you can edit; it was run in Inventor 2026 for every gear type. Smooth STEP files were imported into Inventor 2026 as valid solids within 0.1% of GearForge's own volumes. The SolidWorks macro hasn't been run in SolidWorks yet.
Get gearforge.exe from the latest release. It's one file for Windows 10 or 11.
Double-click it. If Windows says it protected your PC, the program just isn't signed: choose More info, then Run anyway.
Pick a type or a preset, set the teeth and module, check the Mesh card, and press Export.
# write every format without opening the editor gearforge export my_gear.toml out # start a new gear file gearforge example > my_gear.toml
# Rust (GNU toolchain) and MinGW-w64 on PATH
git clone https://github.com/sheetdeveloper/gearforge
cd gearforge
cargo build --release