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Re: PID How to hold an arm in a fixed position without a locking gear box
1. You can write a very simple piece of code that will do a decent job of keeping your arm up. Store your target potentiometer position, and set your motor output to 127, plus the target, minus the current position. (Or the other way around, depending on which direction is up.)
2. A window motor can lift a small arm. For bigger arms, you'll want to look at the RS-540, the FP, or the CIMs. The Good Practices document will tell you what torque is available without additional reduction, and what your peak power is.
3. Some motors burn up, others don't. FPs have a reputation for letting out magic smoke at stall, whereas CIMs have a reputation for being essentially indestructible.
Feel free to post if you have more questions.
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