View Single Post
  #27   Spotlight this post!  
Unread 03-05-2012, 09:37
Dad1279 Dad1279 is offline
Registered User
FRC #1279 (Cold Fusion)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2004
Location: NJ
Posts: 511
Dad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud ofDad1279 has much to be proud of
Re: Dual CIMs and #25 Chain

Quote:
Originally Posted by sst.thad View Post
.....
Another thing I have done for this years demos is make it so only 1 CIM is enabled until we hold a button on the controller, which is when the 2nd CIM is enabled. This will both reduce the stall torque on the chain, and make the drive less jumpy.
.....
Explain the drive being jumpy?

For demos, you could switch to a less grippy wheel, so the drivetrain won't be stressed.

I don't believe you want to drive two motors that are connected together with different values. That will stress the driven motor more. We also had a situation where we tried to calibrate one of the victors on a drivetrain with the other disconnected, and blew out the disconnected victor, but I'm not sure that's related, but given the price of victors it's an experiment I don't want to repeat.

If you really want to try driving just one motor, I would either drive the second at a 'reduced' PWM value so it will be coasting, or make sure the brake jumper is not set on the coasting motor.

Can you post a picture of the chassis? Is it possible with the cantilevered axles there is flexing that is causing the mis-alignment? Are the chains near the frame, or on the other side of the frame/bearings?