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CNC template · Technology and experiments
Crank drive with piston
Model of the crank drive as in an engine: crank disc, connecting rod and a piston sliding back and forth between two guide strips. Top and bottom dead centre are engraved on the base; crank radius and rod length adjustable.
- Size
- 336 × 166 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 14 min
- Bits
- V-bit 60°, 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 dead centres and stroke, mill the axle holes, then cut out base, crank disc, connecting rod, piston and guide strips.
- 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 strips onto the engraved fields of the base; the piston must slide easily between them. Glue an 8 mm dowel into the base as crankshaft and put the crank disc on loosely.
- Glue a short dowel each into crank pin and piston and put the connecting rod on loosely. A longer crank pin serves as handle.
- Turn and watch: the piston moves by twice the crank radius, fastest in the middle of the stroke, and stands still briefly at the dead centres.
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.
