Quote Originally Posted by Chris J View Post
Ah coolant, I hadn't thought of that.

I guess that means I could't have any board involved.
I had thought I might clamp the working sheet to a sacrificial piece of board.

Mmmm, there is always something
Not a problem just use plastic sacrifical board, hdpe is what I use very flat and stable? . . .BUT a far bigger problem you will have with small items like this is the actual clamping and holding.? Unless they have holes for screwing or clamping thru then it's a night mare holding small items for profiling.!
The thinner the material the worse the problem, I often spend more time making holding fixtures, jigs or repositioning clamps etc than the actual parts take to machine. IE: Recently machined some small Brass items and the total Job time was 30 minutes per 4 buckles the machining time was 17mins the rest was made up having to swap clamp positions without disturbing position and 1 tool change(2mins max).