If you are using stepper motors, a threadless leadscrew would not be good.
These things are designed to slip under overload. Unintentional offsets in
your cutting pattern would be a real possibility. Even if not overloaded, a
certain amount o slip would be expected. Now, if the machine slides were
equipped with linear scales providing feedback to a servo system, the
threadless leadscrew would be a viable option.

"Morris Dovey" wrote in message
...
Morris Dovey wrote:

| A friend who saw my machine gifted me with a threadless lead screw
| that uses Thomson's precision-ground shaft material as the
| "leadscrew". It seems backlash-free and it's as frictionless as I've
| seen. It's made by an outfit in Minnesota. I'll try to remember to
| take a photo to post here.

Photo attached.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/