Anything like a die grinder or dotco that uses abrasion for cutting is apt to warp a flat panel due to the heat generated. An exception to that would be if the cut line is fairly short or if you take your time & do the cut in segments so the metal doesn't get too hot.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.