Translational joint / Electric piston

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The LEGO pneumatic pistons are not very accurate, and not electrically controllable. So I designed an alternative, slightly more bulky, using the micromotor. It uses a delightful property of the Archimedean screw parts: if you place a washer on an axle next to the screw axle, it moves it along!

For a larger translational motion, here is its big brother:

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email: leo@science.uva.nl