Start with two pulleys and a belt/chain (Engage belt).

With one pulley twice the diameter of the other the smaller pulley should rotate twice for each revolution of the large pulley.

Now fix the large pulley or 'lock angle' and allow the axle of the small pulley to sweep a circle around the large pulley. The small pulley's angle appears to remain associated with the large pulley, not the belt, and only completes one revolution in violation of the theory of relativity. **Is this a bug?**

~Carl

still with SW2007

This sounds like the problem on some aptitude tests where you have two circles; one's diameter is two times the other's. If you roll the small circle around the large one how many times does it turn? If you just look at thier circumferences, you would come up with two as an answer, because one has a circumferece twice that of the other. Of course you would be wrong. The correct answer is the small circle turns three times because the path you traveled was a circle also.