My Robot Arm

My initial idea for ' the chess player' project, was to have one robot arm that played itself in a game of chess. The robot arm would revolve around the chess board taking each turn. I wasn't sure how this one would've ended though.

Now i am leaning towards the idea of an old, dodgy robot arm playing a new, sleek robot arm.

I feel that this idea is better, as the two arms already have some personality. Which will also be better for me in showing expression in the animation.
I want the old robot arm to be old, slow, confused, juddering and chunky.
And i want the new robot arm to be sleek, smooth, condescending, suave and basically a know-it-all.