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

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
>
>
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