myWerkzeug.de › CNC.myWerkzeug.de › Templates › Technology and experiments
CNC template · Technology and experiments
Trammel of Archimedes
Two sliders run in a cross of grooves, an arm connects them and guides the pen: this draws ellipses of any shape, for frames, table tops or maths lessons. The grooves are formed by four glued-on quarters.
- Size
- 316 × 346 mm, 5 mm thick
- Material
- Plywood
- Difficulty
- Beginner
- Milling time
- approx. 17 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 8 W (cuts 5 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 markings, mill the holes, then cut out base, four quarters, two sliders and the arm.
- 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 four quarters flush onto the corners of the base, using a slider as spacer: this creates the two grooves in a cross. The sliders must glide easily.
- Glue a short dowel into each slider and put the arm on loosely. The distance from the pen to the first slider is one semi-axis, to the second the other.
- Lay the base on paper, put the pencil through the hole at the end of the arm and guide it once round.
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.
