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CNC template · Technology and experiments
Hand-cranked gear train
Two meshing involute gears on a base plate with the right centre distance and a crank. Shows gear ratio and direction of rotation; teeth and module adjustable.
- Size
- 285 × 196 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 17 min
- Bits
- V-bit 60°, End mill Ø 2 mm, End mill Ø 3.175 mm
- Customise
- Size, text and details adjustable with sliders
Free with an account · carve with Chrome or Edge · no installation
Build instructions
Materials and accessories
| Qty | Part |
|---|---|
| 1 | Beech dowel rod 8 mm |
| 1 | Beech dowel rod 6 mm |
| 1 | Wood glue (water-resistant D3) |
Also: sandpaper (grit 120 and 240), a utility knife or fine saw and, for joints, a rubber mallet.
Carving and finishing
- Clamp the workpiece flat on the spoilboard or secure it with double-sided tape, and set the origin as shown in the carving assistant.
- Carve the axle holes and crank hole, engrave the tooth count, then cut out the gears with the 2 mm end mill and the base plate.
- Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
- Only deburr the tooth flanks lightly, do not round them: the involute ensures smooth rolling.
Assembly and final touches
- Push two 8 mm dowels (30 mm long each) firmly into the base plate and fit the gears; they turn freely on the axles.
- Glue a 6 mm dowel into the small hole of the driving gear as a crank. Turn and count: how often does the large gear turn when the small one makes one revolution? In which direction?
How to carve this template
- OpenOpen the template in the app and adjust size and text if you like.
- CheckLook at it in 3D, check run time and warnings.
- Set upThe carve wizard guides you through material, clamping, bit and zero point.
- CarvePress start; the app drives your Grbl router directly over USB.
