On 28/09/2010 11:14 AM, Le_Forgeron wrote:

> If you want a true sine movement (for a constant rotational speed), you
> need a scotch yoke system.

This is what I was really interested to find out - how much the motion 
of a simple crank deviates from a pure sine wave. Apparently the answer 
is "it varies, depending on the length of the crank".

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