RE: [CAD_CAM_EDM_DRO] Positioning

> Actually, it cant be done (the update rate is too slow).
> And the crap capacitive scales are NOT accurate.
>
> Glass scales are cheap and accurate.
> Some solutions can in some ways feed this back.
> It is not common, and it is not easy.
>
> Of commercial machines in the 70.000€ range, about 2% had glass scales.
> They were not necessary for most users.
>
>
> On 01/06/2014 23:52, 'David G. LeVine' dlevine@...
> [CAD_CAM_EDM_DRO] wrote:
> > With the advent of good, inexpensive capacitive scales (yes, that $20
> > digital caliper is a good example), why not use cheap, rolled,
> > anti-backlash ball screws (not precision ones) and treat the
> > positioning as a servo-system? Servos are an old technology and the
> > feedback allows very accurate positioning and high repeatability. If
> > you want to see how it can be done, look at LinuxCNC (was EMC2) which has
> it built in.
> >
> > Dave 8{)
>
> --
> -hanermo (cnc designs)
>
>
>
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