Thread: Applying the JVN calculator using multiple motors and Mecanum
View Single Post
  #8   Spotlight this post!  
Unread 15-01-2014, 16:25
Caleb Sykes's Avatar
Caleb Sykes Caleb Sykes is offline
Registered User
FRC #4536 (MinuteBots)
Team Role: Mentor
  
Join Date: Feb 2011
Rookie Year: 2009
Location: St. Paul, Minnesota
Posts: 1,053
Caleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond reputeCaleb Sykes has a reputation beyond repute
Re: Applying the JVN calculator using multiple motors and Mecanum
It seems that question (1) has been definitively answered. Add the stall currents together to get the stall current of the 2-motor system.

I am curious about questions (2) and (3) though. Is that the value of CoF that is needed for this problem? On the AndyMark website, the forward/backward CoF is listed as 0.7 for mecanum wheels. Is that implied to be on FRC carpet? None of the plaction wheels have static CoFs listed, but all of the Rubber Treaded Wheels do.

If 0.7 is correct, and if you are not worried about drawing too much current, I think that you should gear it to be faster since you're not gaining any more pushing power.

On the same topic, does this mean that the max pushing force of ANY normal (i.e. with wheels) robot is ~155 pounds, assuming 155 lb robot, 0.93 carpet efficiency, and 1.07 CoF? I understand that many teams use their low gear so that their robot does not draw too much current, but having that upper bound on pushing ability is interesting.
Reply With Quote