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CNC template · Technology and experiments
Geneva drive (Maltese cross)
Intermittent drive as in old film projectors and clocks: a crank with a pin advances the cross by a quarter turn on every revolution and locks it in between.
- Size
- 310 × 294 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Expert
- Milling time
- approx. 15 min
- Bits
- V-bit 60°, 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 | 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 holes, engrave the pin marking and cut out all parts: base plate, cross, crank disc, locking disc and spacer.
- Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
- Lightly break the edges with sandpaper (grit 120, then 240) and remove burrs.
Assembly and final touches
- Glue the locking disc onto the crank disc so that its cut-out points to the engraved marking; the centre holes must line up exactly (a dowel helps with alignment).
- Glue a piece of 8 mm dowel into the hole at the marking as the drive pin, standing 10 mm above the locking disc, and a second one opposite as a handle.
- Push two 8 mm dowels into the base plate. Put the crank on one axle, and on the other first the spacer and then the cross. Turn slowly: the pin enters a slot and turns the cross by 90°, then the locking disc holds it.
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.
