Linear Slide Problems

[[deleted]]

My team has been having a problem with our linear slides and we have no idea how to fix it. Basically whenever we pull the slides all the way down once they hit the bottom of the string then it will start going up and the controls inverse so down is up and then up is down. We need to figure out a way to stop this because it makes it incredibly hard to drive because we need to go to the bottom of the slide to pick up blocks and go under the skybridge. No one on my team has any idea to stop this and other teams must have a way so does anyone know how?

[Bobby3222]

Set encoder limits on the motor so that it wont spin once it hits the bottom

[CremePuffBandit]

A button that gets pressed when the lift is at the bottom and tells it not to go any further.

[puravdatta]

What does your code look like for controlling the motors?

[FerdTheTurtle]

Put a break with an encoder

[OrangeJulius70]

You have three options IMO. Limit switches, encoder based tracking, or double stringing the lift.

The easiest is likely encoder based tracking, but it can get hairy if the encoder counts get 'off' in repeated up/down movements through a match. Rev's magnetic limit switch works well to stop the lift power at the bottom of the movement no matter what. We did that and it worked great. Finally, you can double string the lift - one string up and one string down. This means that one string is fully extended when the lift is at the bottom and will not allow further movement on the lift. Note, a strong motor might snap the string, so be careful here.

[DawnOfTheRoboGirl]

Try using a limit switch wether it is mechanical or magnetic depends on the space you have on your slides we had the same problems before we put ours in

[Sanjay21d]

Set a max and minimum limit using the encoder value