Quote:
Originally Posted by SoftwareBug2.0
We've had good luck with pneumatic pistons that need to stop at locations other than the ends. In our 2005 robot we had an arm that was raised and lowered to various heights by a single huge pneumatic cylinder, and it took no special programming or driver practice to control. We were also happy using an intermediate location to aim our 2013 robot. I think they're easier to write software for than a motor because they don't burn out when you tell them to do the wrong thing.
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We struggled with this last year. Plumbing a solenoid valve as described in the tutorials gives you a cylinder that is always pushing one direction or the other; it won't stay still. We managed something with two separate valves which worked, but it never really stopped; it always drifted one way or the other. But yes, when you can use them, they are much more predictable, consistent, and self-limiting.