CAD CAM EDM DRO - Yahoo Group Archive

RE: [CAD_CAM_EDM_DRO] Positioning

Posted by Tony Smith
on 2014-06-02 05:55:45 UTC
You are confusing 'accuracy' with 'possibly not suitable for the specific task'.

Tony

(why am I not surprised...)



> 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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Discussion Thread

David G. LeVine 2014-06-01 14:52:58 UTC Positioning Hannu Venermo 2014-06-02 04:31:36 UTC Re: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-02 05:55:45 UTC RE: [CAD_CAM_EDM_DRO] Positioning Hannu Venermo 2014-06-02 22:08:15 UTC Re: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-02 22:46:24 UTC RE: [CAD_CAM_EDM_DRO] Positioning Hannu Venermo 2014-06-03 01:10:22 UTC Re: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-03 02:02:35 UTC RE: [CAD_CAM_EDM_DRO] Positioning Keith Burton 2014-06-03 03:35:10 UTC RE: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-03 06:40:53 UTC RE: [CAD_CAM_EDM_DRO] Positioning Hannu Venermo 2014-06-03 09:46:21 UTC Re: [CAD_CAM_EDM_DRO] Positioning John Anhalt 2014-06-03 10:28:10 UTC Re: [CAD_CAM_EDM_DRO] Positioning Christopher Erickson 2014-06-03 10:31:22 UTC RE: [CAD_CAM_EDM_DRO] Positioning CS Mo 2014-06-03 10:38:42 UTC Re: [CAD_CAM_EDM_DRO] Positioning Jon Elson 2014-06-03 11:02:30 UTC Re: [CAD_CAM_EDM_DRO] Positioning CS Mo 2014-06-03 11:19:27 UTC Re: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-03 12:11:47 UTC RE: [CAD_CAM_EDM_DRO] Positioning Andy Wander 2014-06-03 12:42:29 UTC RE: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-03 13:39:23 UTC RE: [CAD_CAM_EDM_DRO] Positioning Randall Wink 2014-06-03 14:48:12 UTC RE: [CAD_CAM_EDM_DRO] Positioning Jon Elson 2014-06-03 19:42:16 UTC Re: [CAD_CAM_EDM_DRO] Positioning William Thomas 2014-06-03 19:55:50 UTC [CAD_CAM_EDM_DRO] Positioning Jon Elson 2014-06-03 21:14:51 UTC Re: [CAD_CAM_EDM_DRO] Positioning William Thomas 2014-06-04 10:30:56 UTC Re: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-07 10:36:28 UTC RE: [CAD_CAM_EDM_DRO] Positioning Hannu Venermo 2014-06-07 10:52:15 UTC Re: [CAD_CAM_EDM_DRO] Positioning Steve Blackmore 2014-06-08 00:42:15 UTC Re: [CAD_CAM_EDM_DRO] Positioning Hannu Venermo 2014-06-08 23:26:25 UTC Re: [CAD_CAM_EDM_DRO] Positioning David G. LeVine 2014-06-09 10:48:55 UTC Re: [CAD_CAM_EDM_DRO] Positioning Steve Blackmore 2014-06-09 15:51:45 UTC Re: [CAD_CAM_EDM_DRO] Positioning David G. LeVine 2014-06-10 22:11:27 UTC Re: [CAD_CAM_EDM_DRO] Positioning Steve Blackmore 2014-06-10 23:32:12 UTC Re: [CAD_CAM_EDM_DRO] Positioning David G. LeVine 2014-06-12 15:55:17 UTC Re: [CAD_CAM_EDM_DRO] Positioning Steve Blackmore 2014-06-12 23:30:32 UTC Re: [CAD_CAM_EDM_DRO] Positioning Christopher Erickson 2014-06-18 15:43:45 UTC Re: [CAD_CAM_EDM_DRO] Positioning Christopher Erickson 2014-06-18 15:44:17 UTC RE: [CAD_CAM_EDM_DRO] Positioning Tony Smith 2014-06-18 15:44:45 UTC RE: [CAD_CAM_EDM_DRO] Positioning John Anhalt 2014-06-18 15:45:06 UTC Re: [CAD_CAM_EDM_DRO] Positioning ED MAISEY 2014-06-18 15:45:49 UTC Re: [CAD_CAM_EDM_DRO] Positioning Christopher Erickson 2014-06-18 15:45:55 UTC RE: [CAD_CAM_EDM_DRO] Positioning David Mannock 2014-06-18 15:46:04 UTC Re: [CAD_CAM_EDM_DRO] Positioning David G. LeVine 2014-06-20 15:33:34 UTC Re: [CAD_CAM_EDM_DRO] Positioning