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Re: Motor driven catapult gear ratio
We are using 2 CIMs + 2 775s. The two 775s are in a dual input adapter Versaplanetary with a 4:1 ratio. That gearbox and the 2 CIMs are plugged into a VEXpro single speed gearbox at 5.33:1. After that there is a 12:26 and 15:26 stage.
Arm length, arm travel time, release angle, cradle construction, cradle geometry and a lot of other variables go into making a motor catapult work well. We're still tuning ours.
For consistent shots, the arm geometry and also the motor speeds play a huge rule. We have both a pot and an encoder on our arm to do both position and velocity feedback.
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Team 647 | Cyber Wolf Corps | Alumni | 2003-2006 | Shoemaker HS
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LRI | Alamo Regional | 2014-20... "Competition has been shown to be useful up to a certain point and no further, but cooperation, which is the thing we must strive for today, begins where competition leaves off." - Franklin D. Roosevelt
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