Theoretically, A Vertical Mill Can Make Another Vertical Mill

(Let's not tell that to SkyNet.) This is not true for a lathe.

Some operations should be easier on a lathe.  In the current instance boring a .501" through hole in a piece of Delrin with a .788" ID x .278" deep bore in on end.

My attempts to do this with the lathe have been disappointing.  I do not think it is technique.  I used a 3/4" Forstner bit to put a .75" ID hole with the goal of using a boring tool to enlarge it to .788".  The cutting tool jusr kept bouncing from side to side, making a very large, poorly centered hole.

Now I am using the mill.  I was able to use edge finder to get my cutting tool exactly centered.  Next I used my whatchamacallit for holding parts in the same position in the laws so I do not need to use the edge finder for identically sized parts.

I decided that instead of boring on the lathe to use my circle cutting program to enlarge the hole to .788" on the mill.  That worked perfectly and without any drama.  .788" was still a bit tight, so I am enlarging to .792".