Quote:
Originally Posted by prometheus
This is a question for the veteran teams out there, or anyone who has had some success with an electric arm. How did you keep it in place once you got it where you wanted it? Did you balance it some way? What kind of gear box did you use?
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Motor driven arms can be held in place by the worm gear (in the case of the window motors), but this does carry some risk to the worm gear. The same can be said for any setup with at least some friction and a really big gear ratio -- sufficient gear ratio might be enough for the friction to hold the load in place (depending on a lot of factors, of course).
Otherwise, you could use a ratcheting system, or be content to float a bit around the optimum position with software control.