Re: Just How Accurate Is CNC?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Heritage"
<john.heritage@v...> wrote:

> 0.001" is around 0.0254mm.
>
> The newest commercial machine, driven by linear motors, can
> achieve a tolerance of 0.001mm.

Thank you John for taking time to respond.

The mill in question is an Nantong factory built CNC workbench mill
(about 800 lbs. with electrical control box). The mill is virtually
new, however the owner has replaced the stepper motors and ball
screws and populated the control box (which was empty) with
components that are generally available (and that he sells).
Commercially distributed versions of similar mills from Nantong
reputedly achieve positioning and repeatability in the neighborhood
of 0.0001". As I said earlier, he is estimating only 0.001 on his
machine.

It appears to me that his modifications were not too successful.

Any thoughts or guidance?


Regards to all,
Another John