Yup! Measured at 5/8” and scribed a line across with a punch, using a straight edge.Did you centre punch before drilling?
I said “dumb” questions!
I still think a fence on a drill press would work to help keep my holes in line. Like a mill, that way one axis is fixed. As long as it’s squared up properly?
We can forget I asked about chucking up a carbide burr
In the interest of safety I kind of dropped this idea. I agree that “probably” this could work, but this “shouldn’t” be tried at home without supervision.John and Janger are both right in a "perfect world" but seldom are we hobbiers in that world...the fact is your idea of a fence bolted to the drill press table will work but I "would" use a fine fluted carbide rotary tool/burr (no upwards or downwards pull to work piece or cutter) with straight flutes instead of a spiral mill cutter and feed very slow . With a very slow feed of the work piece into the cutter I can't see that thin of sheet metal doing much damage to a spindle guide .