Cim-Sim gearbox for shooter questions

[RoboCat2005]

Originally Posted by Kevin Sevcik

If you're only running about 0.5 to 1" of compression now, you really shouldn't be bogging those motors down, even if those are the weaker FPs. You really shouldn't be having problems if you have 0673 FPs. Do you have any guess how much current the motors are pulling when it's running without any balls? It should be something less than 10 amps. Anything more means you have some serious mechanical binding somewhere.

Frankly, your system looks like it should manage better than a foot or two. I'm leaning towards there being some significant mechanical resistance somewhere in your system. Your sprocket-chain connect there is a possibility. I'd also look at your bearing system for the axle of those shooter wheels and make sure you don't have any resistance anywhere. Some of my kids had a shaft collar rubbing against an aluminum retaining plate. It warmed up the shaft nicely and also slowed done the shooter a good bit.


I guess the other thing I would do is make sure both motors are actually running and pushing the shooter in the right direction. You can check that by unplugging one of the motors at a time and making sure the wheel still turns and in the correct direction.

EDIT: Now that I see you're runnig the new 170W FPs, you might as well swap those out for a pair of the BaneBots RS-550 motors. Those are 250ish watts but otherwise physically identical to the FP motors. That'll atleast give you a little more speed and torque.

As of right now the wheel and the sprocket set up spin extremely free and no binding in there, the motors are both spinning and in the right direction, weve checked that a lot. But pretty much as the ball drops in from the top the motors bog down and the ball just kind of flops out with no energy at all.