30 : 1
30 : 1 · module 2, one start
m 2 · 20° · ZA
The starter drive: a single-start module 2 worm turning a 30-tooth throated wheel, 30 : 1.
Sample · m 2 · 20° · ZI
20 : 1 · ZI two-start, M3 hub
A two-start involute (ZI) worm and a plain 40-tooth wheel whose hub holds an M3 set screw in a captured nut.
What's in this design
Worm · 2 starts
- 2 starts, right hand · tip Ø26, pitch Ø22, root Ø17 mm · 34 mm long · bore Ø5 mm · no hub
Wheel · 40 teeth
- 40 teeth, plain · outside Ø84, pitch Ø80 mm · face 17 mm · bore Ø8 mm · hub on one end, 2 × M3 set screws (captured nut)
The mesh · m 2 · 20° · ZI
- ratio 20 : 1 · centre distance 51 mm · lead angle 10.3° · efficiency 77 % (μ 0.05) · back-drivable
The link opens the worm and wheel in the Worm Gear Designer's 3D view. Change the module or pitch, the starts, the wheel's teeth, the bores or hubs, then download STL or STEP.
More samples
Related worm drives
40 : 1
40 : 1 · module 1.5 on D-flat shafts
m 1.5 · 20° · ZA
A printable 40 : 1 reduction on 5 mm and 8 mm D-flat shafts, with 0.1 mm print compensation on both parts.
40 : 1
40 : 1 · module 3, keyed
m 3 · 20° · ZA
A module 3 single-start drive on keyed 12 mm and 20 mm shafts, the wheel throated to wrap the worm.
15 : 1
15 : 1 · normal module 4, ZI
m_n 4 · 20° · ZI
A two-start involute worm sized in the normal system (m_n 4), on keyed 16 mm and 25 mm shafts.