This was posted on another forum, and I thought some folks over here might have some ideas on how to do it.

I am in the market for a lathe.

Something I need to do frequently is to clean up threads on large fasteners. These are usually old motorcycle axles. This is easy to with a manual lathe that has a fixed relationship between the tool and the spindle. How would you do this on a CNC lathe that only controls the speed of the spindle, not the absolute position?