Pnuematic Piston Tightness Fix

So, on my wings, my piston is tight for some reason. When we loosened the screw that connects to the c-channel and that helped. We practiced for a bit and everytime we took out the air, then the one that we had trouble with didn’t fully retract and the other one did. I want to know if there is some type of grease or something else I can do other than loosening the screw until the c-channel falls off. Here is a photo of it because I know you guys love photos.


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Which screw did you loosen

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I will go ahead and answer this one for him since we are on the same team. Below is the picture with circles around the two screws we loosened. Thanks for your help!

Also what is the top picture lol

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Try moving it with your hand to see if it is hard to move manually

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If either of the screws are overtightened it will stop the piston from being able to pivot, in order to both extend and retract it needs to be able to pivot. Finding a sweet spot where the screw is tight enough to avoid unwanted movement and slop but loose enough to allow the piston to move side to side is key. I would reccomend tightening it to the point where it just starts to be difficult to move by hand and then unscrew 1/4 - 1/2 turn at a time until you find that sweet spot.

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It is relatively easy to move with pushing it but there is an obvious higher tension in that side. Tommorow I will try @Gearheads526A idea of loosening the screws more. We have tried this but it failed. Thank you guys for all your help!

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It could be the other screw, the one that is circled in this picture

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Yeah, i was looking at it yesterday and the metal seemed to be scrubbing together… I am going to put 2 washers to separate it from the other c-channel. Think that may work but thanks

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Part of the reason is because the piston is pushing forward. Move the piston inside the robot more and it will pop out easier. We had this same problem, as the pistons push forward. Push out with your hand on the piston rod, so that you know if that is the problem.

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Thanks for the suggestion! We are actually a first-year team (meaning no pneumatic experience until a few weeks ago) All the help on this thread is much appreciated. We love all the help we’ve gotten and have so far tried all these ideas. The piston is less tight compared to how it was originally but still seems a little bit tight. With worlds coming up soon, there’s not much left to do. (Although we are in middle school, our coach takes our robot tomorrow April 23)

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Nice! We will see you at worlds. We are in the same division as your sister team Mechanized Metal (47969E)

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