Powered my little lathe type trimmer by screwing it to a plywood base that sticks out a couple inches past the non-crank end. The plywood then clamps into the vise on my drill press table. Then hose clamp a four inch long piece of heavier duty rubber hose one inch onto the shaft where the crank handle has been removed, and in the other end of the hose clamp one inch of a three inch long piece of 1/4" brass rod, (Steel, Plastic, I don't think it matters.) Now chuck the end of the rod into the drill chuck, adjusting the table up to the proper place.(There should be a couple inches of empty rubber tube between the end of the shaft and the end of the rod. This works like a U-joint and shock absorber.)
Then I epoxied to a speaker magnet one of those micro switches with an arm from the lid of a washing machine. This is connected to the middle of a shortened extension cord such that the hot wire is inturrepted by the N/C, and the drill press is plugged into the female of this switch setup, with the male end of the switch setup now plugged into power. The magnet holds the switch on the drill body in the exact place from the drill-lowering-crank shaft to turn on the switch when the lever is cranked. (Against the thumbscrew of the depth stop is a good place to put the arm of the switch, to turn off when the drill chuck is up in "rest position".)
Now check all your adjustments: (1-magnet held on/off switch position. 2-Adjust for throw on trimming lathe. 3-Tighten chuck/vise/shell holder, hose clamps, 4-Power.
Now chuck shell, Turn on Drill Press Switch, (Drill press shouldn't turn on until chuck feed handle is cranked), and Crank chuck feed handle. Drill press should automatically turn on. Gently engage shell. Rubber hose gives shock absorption. Takes about 1 second to trim shell, let chuck back up, and it should automatically turn off! Walllla. (That's French for, "See what I did!")
This is how I do my .30-06. Works perfectly. It took about five shells by hand to decide to concoct this.
Let me know if you like it.