So my team has an 8 bar lift with a 7 to 1 and high speed motors. We have competed before with this set-up without problems. Our lift all of a sudden started to stop. And stop quickly. We have changed the motors, motor controllers, and the amount of rubber bands. We dont have any idea what the probl…

Seems like the motors are twitching, can you post your code?

Too many rubber bands, the lift is stalling out.

My socks are ready. code.zip (3.88 KB)

One of our teams had a weird twitching similar to what is in the video. We tried lots of different things (Re-download Code, Check Motors, etc.), but couldn’t get rid of it. Finally, we tried a different cortex and had no problems after that.

We have tried a new, straight out of the box, cortex. We have have also removed some rubber bands but still can’t seem to fix the issue.

We have had this problem. If there are two buttons/functions both setting the motors to different values, then the motors will go back and forth between the two settings. For example, if Btn 5U is not pressed, then run motors at 0, but if Btn 5D is pressed, then run motors at -127. When you press Bt…

Bryan R: …If there are two buttons/functions both setting the motors to different values, then the motors will go back and forth between the two settings. … I think this is an excellent suggestion to look at. The twitchy behavior smells of conflicting code commands. I was going to ask if t…

If you can, I recommend oulling the shafts from the motors and taking off the rubber bands. See how smooth it is there. Then, replace the rubber bands. Is the force consistent all the way through lifting? (Gets harder and harder to lower the farther you go) With improper rubber band geometry you can…

We had the exact same thing. check the code for this.

Competition tomorrow. Need help.

VEX V5 Technical Support

jpearman February 16, 2017, 8:52pm 15

I know, it just made me laugh, the code came from here. I’m sure I gave it a much less cuddly name.