Trying to widen a hole on a planer blade that goes over a alignment pin on the cutterhead (DW735). I tried using a cobalt bit (rigid) and it ended up getting chewed up and cut very little metal.
Is there a way to do this in a home shop? Do I need a diamond or carbide bit? Would it be worth taking the knives to a metal shop? What do you guys think?
More on my frustration here: