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Build a Mechanical Crane

Build an operational crane with a four-bar linkage and control it with your hands.

The mechanical crane has at its heart a four-bar linkage. The main mechanical advantage of this specific configuration of the 4 bar linkage is that with a very little hand movement it can generate a much larger movement somewhere else.

Moving the handles separately will allow you to understand what each one does but it’s combining both hands simultaneously that generates the most interesting and challenging movements.

Add a string and a hook to simulate cables
Add a string and a hook to simulate cables
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Add a string and a hook to simulate cables
You can use the connector holes as guides
Triangulate your structure for additional strength
There are many ways to triangulate structures, try your own first

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