Two Questions:

Table top sherline mill using myTmill software.

First, I was thinking that I would make my CNC part out of wood
to dry run my program and set up.

Now I'm thinking that even wood is kind of hard and
has issues. Sawdust, heat, etc...

Question, is there anything even better that using wood
to practice on? What about balsa wood? And what about
some type of plastic, not expensive nylon or the like?

Thanks.


Second, Is there a web sight that teaches how to
specifically use linux with a cnc machine? As opposed
to wading through a geek sight with all that other stuff?

Thanks.