Distance Moved
The linear distance a screw shaft moves when it is rotated through an angle of degrees is:
where is the lead of the screw.
The distance ratio of a simple machine is defined as the ratio of the distance the applied force moves to the distance the load moves. For a screw it is the ratio of the circular distance din a point on the edge of the shaft moves to the linear distance dout the shaft moves. If r is the radius of the shaft, in one turn a point on the screw's rim moves a distance of 2πr, while its shaft moves linearly by the lead distance l. So the distance ratio is
Read more about this topic: Screw (simple Machine)
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