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CNC template · Technology and experiments
Rack and pinion with scale
A pinion pushes a rack with millimetre scale along a guide strip: rotation becomes sliding, as in steering, drill presses or rack railways. How far does it move per turn? It is engraved next to it.
- Size
- 296 × 217 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 26 min
- Bits
- V-bit 60°, End mill Ø 2 mm, End mill Ø 3.175 mm
- Customise
- Size, text and details adjustable with sliders
- With a laser
- diode laser from about 10 W (cuts 6 mm)
Try it without 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.
- Engrave scale and text, mill the axle holes, the toothing with the 2 mm end mill, then cut out base, guide strip and pinion.
- Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
- Before gluing, dry-fit everything. If a joint is too tight, increase the clearance by 0.05 mm and carve the part again; if it wobbles, reduce it.
Assembly and final touches
- Glue the guide strip onto the engraved field of the base. Glue a dowel into the base as axle and put the pinion on loosely.
- Lay the rack between strip and pinion. Crank with a piece of dowel in the pinion as handle and read on the scale how far it travels per turn.
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.
