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

Common....i don't know.....by logical thoughts metall is ground. but there have been car manufacturers connecting positive at the chassis before also. Never know what this people think when they design it.

Since some brands are packing insulation kits in i guess it is common that some manufactureres switching the electrical flow.-))))
Dont forget plus is minus and red is black.!!
How ever common or not if it will do the trick then its ok.
The insulation material is awalable only for a few cents or simply turn it on the lathe......since you are working on it anyway.

have fun
Klaus



figNoggle <david@...> wrote:

hi klaus-

thanks - i was going to do that as a last resort. is this common?

i'm trying to get my head around why this is happening in the first
place..

david

On Thu, 3 Aug 2006, Klaus Pack wrote:

> Hi David....
>
> just for this reason some scale brands have a insulation kit coming with the scale.
> If you dont have one simply get one from the electronic parts store.
> a thin layer off plastic with some little plastic sleeves for the screws like they use for the Transistors.
> Plastic screws and a plastic washer will do the trick also.
>
> good luck
> Klaus
>
> figNoggle <david@...> wrote:
>
>
> 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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