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CNC template · Technology and experiments
Pantograph for enlarging
Pantograph of four drilled bars: trace a picture with the tracer and the pencil draws it two, three or four times as large. The holes for each scale are labelled, the joints are dowels.
- Size
- 338 × 156 mm, 5 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 17 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 |
| 2 | Wood screws 4 × 35 mm with wall plugs |
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 ratios, mill joint and pen holes, then cut out the four bars and the base block.
- 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
- Put bar O–B with end O on the base block and hinge bar B–P at end B. For a scale of 2 : 1 attach bar T–C to hole “2” of O–B and bar T–E to hole “2” of B–P; their free ends meet at T. Likewise for 3 : 1 and 4 : 1.
- All joints are dowels with washers, only tight enough to move easily. A pointed dowel goes into T as tracer, a pencil into the large hole at the end of B–P.
- Fix the base block to the table with two screws or a clamp. Trace a template with the tracer: the pencil draws it enlarged at the chosen scale.
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.
