Love this! This is how I wish someone had explained physics to me.
I always wondered how a crank sharpener gets such a sharp point, so I asked Claude Opus 5.5 to build me one I could take apart.
How it works:
> It built the whole sharpener from one picture. Every gear, cutter and spring is three.js code.
> Turn the crank and both cutters circle the pencil while a fixed 36-tooth ring spins each one.
> 15 helical edges per cutter: 12 turns, 1,080 cuts, a 22° point, then the crank goes light.
> Pull the drawer and the cedar curls are sitting in clear acrylic.
I packed the whole process into a Claude skill, so you can build your own from any picture.
Free skill and every prompt in the article below👇
Learning
Interactive 3D crank sharpener built from one picture
The author asked Claude Opus 5.5 to build a crank sharpener they could take apart. It generated the whole mechanism in three.js from one picture: turn the crank and both cutters revolve while a fixed 36-tooth ring spins each one, with 15 helical edges producing a 22° point.
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- Made with
- Claude Opus 5.5, three.js
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