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CNC template · Technology and experiments
Block and tackle with pulley blocks
Two pulley blocks with one or two sheaves each, made of three glued discs: with two sheaves you need only half the force, with four only a quarter, but four times as much rope. For measuring with a spring scale.
- Size
- 408 × 272 mm, 5 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 23 min
- Bits
- 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) |
| 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.
- Mill axle and hook holes, then cut out sheave discs and cheeks.
- 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
- For each sheave glue two large discs with a small one centred between them: this forms the groove for the rope. The sheaves must turn loosely on the dowel.
- For each block thread the sheaves onto a dowel and glue the two cheeks onto axle and upper dowel, about 1 mm wider than the sheaves. Hang the fixed block on a hook and the load on the loose one.
- Tie the rope to the fixed block and run it alternately over the sheaves. Measure with a spring scale: the pulling force drops with each supporting rope section, the rope travel grows by the same factor.
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.
