Daily engineering puzzle

Tolerance

One mechanism a day: a gear train, a lever, a pulley block, a screw jack and more, drawn with its numbers. You get six guesses at the output. Each one comes back Higher, Lower or Within 5%.

A new puzzle every day at midnight, London time. Everything is ideal: no friction, no slip, g is 9.81. Practice gives you a random one whenever you like.

I'm Arthur. I'm not an engineer by trade, I just like working out how things move. I check every formula with tests, but if one looks wrong to you, email me and I'll fix it.

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