actual size 18 cm
Sequential Gearbox
€43.20
Power transmission, Spectra series
- Parts
- 130
- Build
- 5 hrs
- Level
- Advanced
actual width 12 cm
Power transmission, Alpha series
Paradoxical Gear
€28.80
In stock, ships within 2 business days
Two interlocking gears that seem to turn the same way, which two wheels in direct mesh cannot do. The explanation lies in offset axles and a planetary stage hidden between them. Take the mechanism apart piece by piece to see it. 42 parts, 75 minutes to build.
- Parts
- 42
- Build
- 1 hr 15 min
- Level
- Beginner
- Footprint
- 12 × 12 × 8 cm
- Weight
- 165 g
- Glue and battery
- None
Beginner: a good first build
Order today: shipped by Thursday 12 November at the latest.
Free delivery in France on orders from €99.
- Missing part replaced free
- Ships within 2 business days
- 14-day returns
- Illustrated manual included
Ages 14 and up. Contains small parts.
Paradoxical Gear in detail
The story
In the 18th century, the Scottish astronomer James Ferguson presented a famous "mechanical paradox": a single driving wheel turns wheels mounted on the same axle in different directions. This model follows the same spirit: a motion that seems to defy intuition, until you take its logic apart.
What you'll see move
Turn the crank: two interlocking gears appear to turn in the same direction, which is impossible for two wheels meshing directly. The explanation sits between them: a planetary stage and offset axles. Take the mechanism apart and the illusion disappears.
Specifications
- Number of pieces
- 42 pieces
- Assembly time
- 1 hr 15 min
- Difficulty
- Beginner
- Dimensions
- 12 × 12 × 8 cm
- Weight
- 165 g
- Material
- PLA with 30% wood fibre
- Hardware
- Micro-screws and ball bearings included
- Glue required
- None
- Battery required
- None
In the box
- 42 wood-fibre composite parts, ready to assemble
- Micro-screws and ball bearings
- Illustrated step-by-step assembly manual
- No glue and no batteries: everything fits together and turns by hand
14+
Ages 14 and up. Contains small parts: not suitable for children under 3, choking hazard.
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- Parts
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- Build
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- Level
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- Build
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