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CNC template · Technology and experiments
Cam display with three cams
Upright display board: a follower slides in a guide and follows the cam below. Three interchangeable cams show how an eccentric, a heart cam and a triple cam turn rotation into lift, as in camshafts and sewing machines.
- Size
- 352 × 416 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 28 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 the scale, mill axle hole and slots, then cut out board, feet, cams, follower, guide and cover strips and crank.
- 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 left and right of the engraved track onto the board and the cover strips on top so they overlap the follower at the front. The follower must slide up and down easily.
- Push a dowel through the board (it turns loosely), glue or press a cam on the front and the crank on the back. Slot the board onto the two feet.
- Crank slowly and read the scale: the eccentric lifts gently like a sine curve, the heart cam evenly, the triple cam three times per revolution.
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.
