This is a small K'nex Eggbeater which I first made by instructions and then made it faster and motorized it.
Here you can find a video of the Eggbeater in action.
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Step 1: The Original Eggbeater
These are the original instructions for the eggbeater you can build all of it except the handle do not make the handle.
Step 2: Making the Original Design Better
This is what you should end up with (plus the beaters)
Step 3: Making the Original Design Better
To make the original design better you start of with building this.
Step 4: Making the Original Design Better
Now put a small grey gear on one side of the crankshafts.
Step 5: Making the Original Design Better
Now you can put the motor and the new crankshaft on like this. (Don't forget to put the little clip on the end of the new crankshaft.)
Step 6: More Pictures
That is just some more pictures if you are having trouble.
Step 7: ACTION
And last but not least some action.(A video.)