Involute spur gear generator
Real involute teeth (20° pressure angle) generated from the base circle, with printing backlash built in. Set the module and tooth count, and the log reports the pitch diameter and centre distance for any mating gear.
Building the model
Loading the 3D view
No adjustable sizes
Ask for the sizes you want to tweak, e.g. “make the width adjustable”.
Specs at the default size
Measured from the actual build on a Bambu Lab A1 in PLA. Every number updates live when you drag a slider above.
- Overall size
- 39 × 39 × 16 mm
- Parts
- 1
- Filament
- 6 g
- Print time
- 13 min
- Build plates
- 1
- Supports
- None needed
Engineering checks
- Undercut-free (≥ 17 teeth)24 teeth
Adjustable sizes
| Setting | Default | Range |
|---|---|---|
| Module | 1.5 mm | 0.8–4 mm |
| Teeth | 24 | 8–120 |
| Face width | 8 mm | 3–30 mm |
| Bore | 5 mm | 2–30 mm |
| Hub with set screw | on | on / off |
| Backlash | 0.15 mm | 0–0.4 mm |
How to make it
- Pick a module (1–2 mm prints well).
- Set teeth; keep ≥ 17 to avoid undercut.
- Add 0.1–0.2 mm backlash for FDM.
- Use centre distance = module × (z1 + z2) / 2.
Print tips
- Print flat, 4 walls; PETG or nylon for load.
- A drop of dry PTFE lubricant helps a lot.
FAQ
Which module should I use?
For small mechanisms 1–1.5 mm; for torque 2–3 mm. Both gears in a pair must share the same module.
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