Re: [CAD_CAM_EDM_DRO] Is this too nuts to consider ?

beer@... wrote:

> I want/need to cut a MUCH coarser thread than my lathe is capable of.
> Ruminating upon possible solutions to the problem
>
> ( when I as younger, I used to THINK about problems, but now ... )
>
> it occurs to me that if I attached a stepper or servo to the lathe
> SPINDLE ( somehow ) and suitably configured the "steps per inch"
> parameter based upon the diameter of the material, I could cut threads
> via CNC !

I once needed to cut an extremely coarse thread. I arranged the gears
on the bracket that allows for special gear ratios. But, the fast rotation
of the leadscrew seemed like it would overload the gear train. So, I
powered the lathe from the leadscrew! This was actually a spiral
on a plate, using the power cross feed. So, I powered the lathe manually
from the cross feed handle, which moved the tool directly, and also
fed power to the spindle through the gear reduction of the leadscrew
and threading gears. It worked fine, too!

You could do the same, powering the leadscrew and allowing the gears
to drive the spindle. Take small cuts, of course, to reduce the load
on the gearing.

Jon