Gear train

A line of involute gears that actually mesh, at the right spacing.

The gear train lays out a line of involute gears, each spaced from its neighbour at the correct centre distance so they truly mesh instead of just sitting near each other. Every gear shares the module and pressure angle (required to mesh), and the dialog shows the resulting ratio live. Helical gears alternate helix hand down the train so they mesh. The gears are separate printable bodies — print them and mount them on your own shafts.

1. Enter the tooth count of each gear, in mesh order (two or more).
2. Set the shared module, pressure angle, thickness, and optional helix angle and bore.
3. Generate: the gears drop in already spaced to mesh, with the ratio shown.