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How to calculate planetary gear ratios?
At one time or another I knew how to do this but it has been a while.
What is the formula for a planeatary gear ratio involving the tooth counts on sun, planet, and ring gears assuming the ring gear is held stationary?
Thanks.
EDIT: I looked a little harder and found it to be (sun+ring)/(sun). 
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
Last edited by sanddrag : 27-02-2005 at 03:26.
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