Try and convince them to get it laser cut. If the laser is using nitrogen or an inert gas it will give an edge finish very close to what you can get with milling. Abrasive water jet would also work but probably be more expensive than laser.
If you are forced into machining you have no choice but to sandwich it between mild steel or aluminum with multiple clamps that you move around during machining.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |