Thanks for that great tip. We are using it to model a possible arm along the lines of this thread:
http://www.chiefdelphi.com/forums/sh...threadid=90284
Here is our model.
http://concordrobotics.com/arm/
I made it so you can play with the position on the robot (for cg calculations), different sprocket ratios between the shoulder and elbow and different starting angles.
Mark