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CNC template · Technology and experiments
Newton and Benham colour tops
Two spinning-top discs for experiments with the eye: the Newton disc blends seven colours into white, the black-and-white Benham disc makes faint colours appear when it spins.
- Size
- 204 × 106 mm, 4 mm thick
- Material
- Plywood
- Difficulty
- Beginner
- Milling time
- approx. 11 min
- Bits
- V-bit 60°, End mill Ø 2 mm, 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 6 mm |
| 1 | Wood paints or acrylic paints |
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 lines and colour names, clear the black areas of the Benham disc 0.6 mm deep, then carve the axle holes and discs.
- Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
- Lightly break the edges with sandpaper (grit 120, then 240) and remove burrs.
Assembly and final touches
- Newton disc: paint the seven fields in the engraved colours. Benham disc: paint the cleared areas black, the rest stays light (with a laser they turn dark by themselves).
- Sharpen one end of a 60 mm long 6 mm dowel and push it firmly through the centre hole, the tip 15 mm below the disc.
- Spin hard: the Newton disc turns light grey instead of colourful; on the Benham disc coloured rings appear that swap order when spun the other way.
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.
