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Re: No Pneumatics?
For us, our transmissions use 3 different air cylinders. One for PTO (power take off), on for Hi-Lo Shifting, and one for our Pneumatic Brake. Some teams use servos to shift, but they are fidgetey. We are going to try a servo powered brake, results to come eventually. Many teams have had success with window motors for shifting multiple gearboxes at onc, but we prefer pneumatics, and with the size constraint it makes life easier. Pistons are also more accurate on many two-position mechanisms, whereas the same mechanism with a motor would require a gearbox and limit switches/potentiometers/encoders.
Pneumatics are pretty simple, as long as you don't try to put a 1/4" hose into a 6mm fitting 
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Junior at the University of Notre Dame, Mechanical Engineering
Got questions (about Notre Dame, robots, college, etc), don't hesitate to ask.
**Bang Boom Pop!** "Was that the robot?" "I don't know, do it again"
**BANG BOOM POP** "Oh, now it's on fire."
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