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Calculating capstan size?

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WebRuss

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Greetings all

64 180 N8244P 24-3499

Alright you flight engineers! I apologize ahead of time if I am not using the right terms here.

I am working on a math problem and having trouble finding the right formula to calculate the depth (number of grooves/turns) and radius (height) of a capstan for a pitch servo using a bridle style connection.

What I know so far is that the travel distance of the pitch cable is 8.75 inches. The servo must generate, according to the manual at least 20 foot pounds of force.

So how do I calculate these values? What other information is needed?

Regards

Russ
 

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