View Single Post
  #13   Spotlight this post!  
Unread 13-05-2014, 09:36
craigboez's Avatar
craigboez craigboez is offline
Mechanical Engineer
AKA: Craig Boezwinkle
FRC #2811 (StormBots)
Team Role: Mentor
 
Join Date: Oct 2008
Rookie Year: 2009
Location: Chicago, IL
Posts: 217
craigboez is just really nicecraigboez is just really nicecraigboez is just really nicecraigboez is just really nicecraigboez is just really nice
Re: Ball Shifter Force Requirements

Quote:
Originally Posted by T^2 View Post
We observed (anecdotally) that at our true top speed of 17.1ft/s (tested under 60fps camera) with a 3-CIM ballshifter, we had trouble shifting at less than 50-55psi. Our robot weight was about 135lbs; feel free to do the rest of the math.
Out of curiosity, is there a need for being able to shift at top speed or was this done just as an experiment? It would seem that to be useful, a shifter will need to shift a) once low speed has maxed out and you want to go to high speed and b) in a pushing match in high speed, when you want to drop down to low speed to limit current. I can't see a use case for downshifting from high speed at top speed.