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Converting Motion

One of the challenges that teams face when working on technical devices is how to convert one type of motion into another. For instance you might have a motor which turns a wheel but want to be able to create a back and forth motion. You need a device (or mechanism) to convert the rotary motion of the motor into a oscillating motion.

I have found a site that gives excellent animations of mechanisms for converting from one type of motion to another. The website belongs to an English firm called Flying Pig. Their website is at: The portion of the site that deals with converting motion can be found at:

The following images show a simple mechanism my team constructed several years ago to make a mannequin's lips move. In the second image you can see the inside of the head where a small motor turned an arm connected to a mechanism to move the bottom lip up and down.