Oh, incidentally. One good trick with the cross slide (aka "milling") vise on the drill press is as follows:
(adjust sizes for whatever you are doing.)
I need to file a slot, a hair over 3/16 inch wide and 1.25 inches long.
First, I scribe the line. Then I move in from each end about 4/32 (3/16 is 6/32. moving in 3/32 would give you a dead on match if your drilling is perfect, but it's not.) - centerpunch those two holes. Then move in a bit over 1/8 inch and centerpunch, repeat. No spacing can be LESS than a hair over 1/8 inch.
now, where you have centerpunched, drill 1/8 inch holes.
Then, on the ends, drill 3/16 inch holes. repeat every other hole. you should have a slot, ready to be cleaned up.
It sounds complicated but only takes a few minutes