Calculation
The angular velocity of input and output axle can be described as formula below:
Where the R and r are the radius of metal ball and input axle, the and are the angular velocities of input and output axle.
A 1:10 dual speed focuser has a gear ratio of 10 and R=4.5r. Thus the angular velocity ratio is actually 11. The gear ratio and velocity ratio should not be confused with each other.
Read more about this topic: Dual Speed Focuser
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