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

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.

________________________________________
Andy Wander | Vice President, Engineering
Verrex Corporation
1130 Route 22 West
Mountainside, NJ  07092
P: (908) 232-7000 Ext. 353
F: (908) 232-9065
C: (610) 389-4819
(610) 847-5947 (Home Office-Wednesdays)
awander@... | www.verrex.com


-----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)
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
> Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
> Yahoo! Groups Links
>
>
>
>
>
>


Addresses:
FAQ: http://www.ktmarketing.com/faq.html
FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com

Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@..., timg@...
Moderator: pentam@... indigo_red@... davemucha@... [Moderators]
URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO

OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
bill
List Mom
List Owner


Yahoo! Groups Links








This communication including any attachments, are intended
for the exclusive use of the addressee(s) and contains
confidential or copyrighted materials. Duplication,
distribution or reproduction is strictly prohibited by law
without written permission of Verrex