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CNC template · Technology and experiments
Beam balance for the lever law
Balance beam with ten numbered hanging holes on each side, pointer and tenoned stand, plus eight equal weight discs. Shows the lever law: force times lever arm is the same on both sides.
- Size
- 344 × 350 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Beginner
- Milling time
- approx. 22 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 |
| 1 | Wood glue (water-resistant D3) |
| 1 | Nylon thread or yarn |
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 numbers and centre mark, mill the holes, then cut out foot, stand, beam and weights.
- 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 stand into the foot and press a dowel in at the top as pivot. Put the beam on loosely: the pointer must swing freely in front of the centre mark.
- Hang the weights in the holes with thread loops or paper clips. One weight at 6 balances two weights at 3 or three at 2: weight times distance is the same on both sides.
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.
