[Ari423]

Originally Posted by steelerborn

I would find a way to hold the position mechanically. You could design using a non-backdrivable gearbox (ex. worm), or you could come up with a brake system to lock the arm in place. Depending on your application you could "offset" some weight on the arm using springs, gas struts, or a counterweight.

That would work fine as long as the arm and gearing doesn't have enough torque to strip the worm gear.