RE: [CAD_CAM_EDM_DRO] chinese dro scale shorting dro display?

thanks andy. i removed the ground from the power cord and now just as ken
(from a previous post) mentioned, vdc is near zero.




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On Thu, 3 Aug 2006, Andy Wander wrote:

> The metal parts of the scale are internally connected to the "+" of the battery or scale power supply.
>
> Make sure that your external power supply(or DRO readout) does not have the "-" grounded to the chassis of the machine.
>
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> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of figNoggle
> Sent: Thursday, August 03, 2006 1:28 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] chinese dro scale shorting dro display?
>
>
>
> hi again-
>
> quick update. sure enough, there's approx. 5VDC between the scale and
> saddle. any ideas how to deal with this?
>
> a more updated account with pictures to show what's going on:
> <http://www.fignoggle.com/workshop/item/2006/8/3/8x12-cnc-project-installing-dro-scales-part-2-shocking>
>
> thanks!
>
> david
>
> CNC Plans <http://www.fignoggle.com/plans/cncplans.htm> (DRO too)
> Sieg X3 and Super X3 Mill Information <http://www.superx3.com>
>
>
> On Thu, 3 Aug 2006, figNoggle wrote:
>
> >
> >
> > hi all-
> >
> > i've run into an interesting problem with the chinese dro scales/displays:
> >
> > i recently mounted a dro scale to a 8x12 lathe. initially the display
> > itself (a cheap shars unit) seemed to work fine, then it just all of a
> > sudden went dim. after checking connections, cables, cleaning the scale,
> > etc.. it appears that the problem is an electrical one. i found
> > this out by disconnecting one part of the scale where the display unit is
> > mounted to the saddle and noticing a very small spark from the tip of the
> > screw as i touch it to the hole in the saddle.
> >
> > if i unplug any part of the chain, the display unit lights back up to
> > normal. the moment the lathe or any part of the display > cable > dro
> > scale is connected to power simultaneously the display dims again.
> >
> > i'll be checking with a voltmeter today to see if i'm shorting or what,
> > but can you see what's going on here?
> >
> > the blog entry which describes this somewhat:
> > <http://www.fignoggle.com/workshop/item/2006/8/2/8x12-cnc-project-installing-dro-scales>
> >
> > the actual picture. note that the scale display unit is not connected to
> > the saddle.
> > <http://www.fignoggle.com/workshop/media/8x12/figNoggle_8x12DROZ.jpg>
> >
> > thanks for your help!
> >
> > david
> >
> >
> > (NEW!) MetalWorkingFAQ.NET <http://www.metalworkingfaq.net>
> > ACME Screw & Acetal/Delrin Kit <http://www.fignoggle.com/kits/acmekit.htm>
> > CNC Plans <http://www.fignoggle.com/plans/cncplans.htm> (DRO too)
> >
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