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Ghost Maker
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3,014 Posts
A couple of ideas come to mind. You can use a crank arm like on a FCG, but sideways. Have the skull on a pole that is restrained by guides to move only up and down, the attach the crank arm to the bottom. This will probably require more torque than a cam.

In terms of the cam, there is no need for the cam to have a sudden drop off; it can have a smooth transition down, just like it has going up. May need to use a rocker arm to get enough range of motion up and down.

Finally, if you could figure out how to turn the windshield wiper motor on intermittently, that would be great...every 5 seconds or so here comes the skull head!
 
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