Quote:
If you use a PID loop to control the arm, it will be able to dynamically control the motor to hold the arm steady.
Look up PID in the whitepapers section or google it.
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Fisher Price motors are not well suited for dead-load (static load) applications, so a PID loop is not the best way to hold an arm steady. It could put you at risk of burning out your motor(s). Therefore, I recommend that you try using a Dewalt transmission with the non-backdrive pins in place. Here's an example:
http://www.jmen.biz/Bees/2004-2005_P...edium/0043.jpg
Directions for interfacing an FP to a Dewalt Transmission:
http://www.chiefdelphi.com/media/papers/1592