Why do these pilot holes this way instead of by hand on the drill press? Because these were placed accurate to .0001", instead of perhaps to .01" using a micrometer and drill press. The slow speed on the drilling is because even 1 inch/min. caused a lot of vibration. But 0.5 ipm was pretty peaceful. The first two were pilot holes at 0.5" and 1.5" from the left end of the workpiece (or more accurately from the left end of the vise, which I was using to register the workpieces against).. These went down .2"--just through the .125" wall. The last hole was a through hole so .3" down from the top.
I made 10 of these in an hour or two, and much of that time I was doing other things while Millie worked away.