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cutting a hole in aluminium?
So I have a small piece of aluminum plate about 2-3 mm thick. This plate has a 6cm by 9cm rectangular hole in it, and I need to expand it by about 5 mm in one direction. I have a dremmel and a bunch of bits which I think it might do the work but I have no idea how to go about it. I need to retain the right angles in the corners, and have things as straight as possible.
What bits or tools would I need to accomplish it, and how do I go about it?
Does it make any sense?