Hand drill · 4 : 1, module 2
m 2 · 20° · straight, AGMA 2005 proportions
The egg-beater drill's drive: a big crank gear spins a 15-tooth pinion four times as fast.

Turn a stepper's output 90°: 18-tooth miters, 5 mm D-flat in, 8 mm out, tapped set screws.
The link opens the pinion and gear in the Bevel Gear Designer's 3D view. Change the teeth, the module or pitch, the shaft angle, the bores or hubs, then download STL, STEP or a drawing.
m 2 · 20° · straight, AGMA 2005 proportions
The egg-beater drill's drive: a big crank gear spins a 15-tooth pinion four times as fast.
m 2.5 · 20° · straight, AGMA 2005 proportions
A crank-driven 3 : 1 for mills and hand generators, both gears on ½" hex.
m 2.5 · 20° · straight, AGMA 2005 proportions
3 : 1 on round shafts: the pinion's set screws thread into the hub, the gear is pinned through its hub.
m 0.8 · 20° · straight, AGMA 2005 proportions
A tiny module 0.8 pair for N20-size gear motors on 3 mm D-flat shafts.