Versa gear box

[Ginger Power]

Originally Posted by dradel

Now that the thread has been hijacked..... Anyone have an idea on the force to back drive with a 20" bar on it?

Sorry, questions arose that were related and I felt the need to respond since it was something I literally just got done with As for the amount of force to back drive a 100:1 versa with a 20" bar... there's some math the be done. I can't speak to that situation specifically, but we ran another 100:1 versa planetary with a cim in it to control our articulated shooter. We used a 48 tooth gear on the hex output shaft to drive another 48 tooth gear (the geometry just worked nicely). The friction in the gearbox was just barely less than what we needed to stall our shooter at a horizontal position. The arm weighed around 12-15lbs and was 15" long. If I had to estimate the ditance from CoG to the output shaft I'd say it was 12".

Hope that gives some sort of reference.