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Originally Posted by Coffeeism
To handle the big ball your motors going to have to constantly run to hold the ball along its circumfrence.
Using pneumatics to hold the ball, the piston would apply a constant force to hold up the ball so you wouldn't have to run your motor constantly.
I would use pneumatics.
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If your mechanism is designed properly, you should NOT have to continuously run a motor to hold a big ball.
I would not use pnuematics for this task if it was the only thing I was using the pneumatics for. It takes 2 or 3 functions (IMO) before adding the pneumatics to the robot starts to make sense.
Also, with the pneumatics you should be careful with how easy it is to release the ball. In 2001, many teams dropped the big ball because they had a hair trigger on their pneumatic claw. The cylinders can be adjusted (I think) to have slower action. I would definitely do this if I were using one to grasp the big balls.