New Machine Design Advice

[EddyCurrent]

Does this give any ideas ?

http://orangenarwhals.blogspot.co.uk...-now-with.html

I used to have a similar thing years ago for a BBC micro only it was an input device. Two perspex arms joined with a potentiometer and both attached to a table with another potentiometer. As the extreme end was moved about over a drawing surface it created a digitised image on the screen. Mapping from the two pots. was quite simple using sin or cos calculations I remember.
So I was thinking about the reverse, two motors, one attached to the base driving a 'shoulder' the other driving an 'elbow' all moving in the horizontal plane over an A3 drawing area.