So this year our arm is a little different from the majority of teams. Ours is an actual “arm”, with two joints. I’ve only seen one or two like it on CD, and I’m proud to be somewhat unique.
My question is that when we move our robot arm down, it falls quickly, and the only way to safely descend is to sparatically press the down button every half a second or so. I’ve done everything I could in the programming to try to slow it down, but no luck.
We are using denso window motors with chain drive, and Java programming. Any help would be greatly appreciated.
Thanks.
We had a similar problem. Its all about the counterweight. We were using bungee cords, and when there were no forces holding the arm down, so it was free spinning, it would only sit about an inch from the floor. We then found a heavy duty spring, it started out at about 4" long. We swapped out the bungee cord for the spring and now when its free spinning it wants to stay almost perfectly horizontal out, stretching the spring to about 7". It made all the difference in the world.
Our arm is incredibly similar to that, our second joint is pneumatic so it’s only got two ranges of movement. So how do you think we’ll do using surgicial tubing as our counter weight? I don’t think we have time to get/order springs to use before shipment.
edit -
is enabling Break Mode on the victors safe? I’ve never heard/seen anything about that.
We put the victors on, and before we had it in break mode the arm liked to just keep going down for no reason at all (made no sense to me, as they can’t backdrive, right?). Whatever the problem was, break mode fixed it.
I posted a topic on here and asked about it when we had our problem, and everyone suggested surgical tubing, so I think you’ll be fine with it.
Great, it’s just too bad we can’t test it out now since we disassembled our robot arm last night for shipping. Thanks for the tip though, it’s a shame we’ll have try it out during the practice matches.
