John,
I see that you used quite a few gears to increase the turning speed of the crab modules. I'm assuming that directly driving the modules was too slow? And, when you increased the speed (thereby decreasing the torque) you found that you required a 2nd motor to handle the job?
Very elegantly done. Between the two-speed, 9fps bot another student build, and now your crab-drive, I'm going to have to find something else to motivate little Art in this off-season!
Can we expect these "custom crab module plates" to be available anytime soon? Great job as usual, John!
BEN