View Single Post
  #10   Spotlight this post!  
Unread 17-10-2015, 06:40
Knufire Knufire is offline
Rose-Hulman Institute of Technology
no team
Team Role: College Student
 
Join Date: Sep 2009
Rookie Year: 2010
Location: Terre Haute, IN
Posts: 740
Knufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond reputeKnufire has a reputation beyond repute
Re: Dog Shifting Gearbox Feedback

Quote:
Originally Posted by RoboChair View Post
15 fps in high gear is slow, very very slow for a 6 CIM drivetrain considering you are likely to lose 10% or more mechanical efficiency, leaving you in the 13 fps range. Our 2014 bot was geared to a theoretical 22 fps and we measured our actual top speed at just over 18 fps(18% efficiency loss). We likely could have geared it a little slower and gotten our top speed a little faster, maybe 19 fps. So I know you can reasonably push the top gear 10%-25% higher, the only reason to keep it in the geared to 15 fps range would be if you need rapid bursts of acceleration to cover sub-20ft range movements on the field.
While 15fps would be slow for California, in general robots out east tend to gear much lower.

Also, I'd expect a 22FPS theoretical 6CIM drive to have massive brownout issues on the RoboRIO without some sort of current management in the code.
__________________
Team 469: 2010 - 2013
Team 5188: 2014 - 2016
NAR (VEX U): 2014 - Present