re the diamond wheel; not long ago I was supplied with an ordinary DeWalt 4-1/2" angle grinder for a field job. Not a grinding wheel, nor cut-off wheel, flap or flat sanding disc....used a carbide tipped circular saw, about 20-24 teeth, barely negative rake. I notched reliefs in formed C1018 plate a full 1/2" thick, heavier of course in the corners. It cut beyond my ability to describe, in both feed rate, finish, and burr free. Haven't searched out a supply yet, but they were DeWalt also.
I mean, 1/2" plate, guided by hand to felt tip marks! Even a Port-A-Band could not have done it.
PS. Be certain guards installed, and path for chips clear. DAMHIKT

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