I have used a hand crank boring machines for many years. Got Power a year ago. I implemented a plan I had though about for a long time. I mounted a 1/2" power drill to an old wooden frame I had kicking around, used some angle iron and welded up a mount that slides up and down like the head on the original machine. Squeeze the trigger and set the lock,cruise control. it has a block to stop it at the right depth, adjustable. It is near as fast as any chain morticer, and at almost no cost.