CNC direct stepper motor drive Lathe Idea. If anyone knows of anything similar please let me know.

Task required its required to do take 12mm to 15mm plastic for drilling and cutting.

Task it would be nice if it could do is to take 4-6mm brass and do the same (thinks the power required would mean Direct drive requires too much torque).

As an Electronics Eng I have no Idea of the torques required to do these tasks.

Mechanical concept the Chuck is moved 0-20mm forward on Rails (cheap drill press bars as rails as i have a matching pair) thru a Fixed bearing linear bearing mounted in shaft bearing on to the a Fixed Drill in a fixed stock and back 0-20mm after drilling. A cutoff cutter mounted on another set of rails very close to the linear/rotary bearing (or sliding chuck) the raw material is then feed forward 0-20mm after cutting for the next item.

Sequence is then repeatable for maybe 10 items then new material is put in the chuck..

I can imagine a lot of Mechanical engineers cringing now.. at the stupidity of this Idea/concept

First Problem to solve is mounting the collet chuck to the stepper motor securely. Stepper shaft 10mm Collet mounting plate thread 14mm. (thoughts grind the stepper shaft to a D shape) or some other method?