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With some modules, you'll have to experiment with the programming to make them work the way you expect.

Back 'n Forth

This back-and-forth movement is great - I just figured out how to make this playing around with motors and parts in my basement. - Keith
Here are some close-up photos of the Back-and-Forth Rack that you can use to build your own.
Use this photo and the one below to make sure the motor and gears are at the right height.
If the gears don't mesh correctly, take another look at the photos and try adding or removing blocks.
Here's a program Keith wrote for this motion module.

See all Motion Modules

What else
Leonardo da Vinci had a similar idea...

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