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Unread 08-11-2015, 23:04
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AKA: Spencer
FRC #4918 (The Roboctopi)
Team Role: Engineer
 
Join Date: Jan 2015
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Re: Dog Shifting Gearbox Feedback

Quote:
Originally Posted by SerpentEagle View Post
With 4 CIMs, according to my spreadsheet, I get around 2 fps less speed on high gear. I know that 6 CIM drivetrains don't have as much improvement as lets say a 2 CIM to 4CIM, but I assume that acceleration and pushing force is a big component to games with defense. Again, according to my calculations, a 4 CIM drivetrain would lose almost 300 inch-lbs of torque on low gear when compared to a 6 CIM with my setup.
On our robot two years ago, a ball shifting setup with two full-size CIM's to a 6 wheel drop center had tons of power, enough to spin four-inch taction wheels. I think the bottleneck is not the amount of motor power or gearbox torque after two CIM's but the traction and number of wheels contacting the ground.

Also think about how much power you consume every match. Its a lot faster to chage a 30% depleted battery than a 50 or 60% depleted battery. If you have the resources to charge enough batteries fast enough than you'd be fine. Just points to consider.