Re: [CAD_CAM_EDM_DRO] Re: Just How Accurate Is CNC?

At 15:53 08/11/2004, John Heritage wrote:

> > 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
>
>I've never heard of Nantong before, but 0.0001" is a fairly tight tolerance
>to hold. The 0.001mm tolerance I mentioned is the tolerance claimed by the
>very newest machines. 0.01mm is a fair tolerance to hold on a part, 0.001mm
>is really pushing it futher out. You are essentially trying to machine to an
>accuracy of a single micron, which is quite something when most micrometers
>can only just about manage to read that level of accuracy.

If you look at the Haas website, they claim accuracy of .0002" and
repeatability of .0001" (at least for the 2 machine specs that I sampled at
random).

Regards,
Tony