Hi Peter Spink,
I think u'll find flash ground is the finish after plate has been flame cut at a specialist profileing w/shop….
when I get plate cut to pattern I allways ask them to knock the lumps off on the grinder…..basicaly a 1m'ish grinding wheel horizontally mounted in a machine with a coolant spray, "not quite" but just lower the steel onto the wheel for a light touch…….reasonably accurate, the molton metal blobs are removed as well as the mill scale (blue color on new plate) don't expect the 2 surfaces to be parallel but good enough for the drill press job tho…….
Never seen lazer cut steel finish yet, is there anyone out there that has…?…….interesting to know……
Ta Clogs…….