I have a run of steel plates to drill. These will be clamped to the mill table in a sandwich, a 6mm top and bottom, with a 12.7mm bit in the middle. There are 8 holes all 10.2mm dia. to be drilled.
I would normally spot these off, but wonder if there are any recommendations of any stub drills suited to go straight in and through, thus removing an operation. I'll be using an old CNC bridgeport. Accuracy needs to be "acceptable" in the terms of if it had been spotted first, but not to toolroom standards. I was thinking of a four facet pointed Dormer? Thanks Bob