Putting a Vex spike onto a jag

[Jon Stratis]

Originally Posted by Camren

1. yes are jags are failing
2. one was fried, 2 stopped working no smoke no sound of components popping, one lost calibration ( we reset it it works). and one for some reason flips the values.
3. the black ones are failing
4. 12v DC motors on a CIMple box
5. the two that stopped working suddenly might have gotten metal shavings in them

Metal shavings are often the cause of failing jags - they really don't like them.

When you say "one for some reason flips the values", do you mean it's driving backwards from what you want? If so, just flip the motor leads on that one to fix it.

When you say 12V DC motors... what motors, exactly? Are these CIM's? Are they some random drill motor you guys found? Without knowing the exact motor and it's specs, we can't really know whats happening.

What are your motors driving? Is there a lot of friction in it, which would cause the motors to wok a lot harder than you would expect? Is it chain driven, and if so, is there a lot of slop in the chain that may be causing short-term stalling when changing directions? Do you have any way available to measure the current the motors are drawing?

Is there a possibility of a short anywhere? Can you check resistances between your frame and the positive/negative terminals on the power distribution board? Can you check the internal resistance (aka between the two motor leads) of your motors, to ensure they are shorted internally?