RE: [CAD_CAM_EDM_DRO] Re:BEI encoder replacement

Hmm-I would like to point out that the40,000 hour life of the lamp is NOT a guarantee-it is sort of an "average" lifespan for that particular lamp, and is arrived at through testing and extrapolation.

What it really means is that if you run a statistically significant number of lamps at their rated current, after 40,000 hours half of them will have failed, and half will still be working.


Andy Wander



-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of danmauch
Sent: Monday, October 11, 2010 12:00 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re:BEI encoder replacement

I respectfully disagree. If lighning strikes the power line and the machines see a surge sure a lot of things will be damaged. Vibration on the BEI encoder is not the reason it failed . It failed because the machine propably had 40,000 hrs.
The owner has a choice. My method which is a five minute fix to unsolder and replace a $1.60 bulb that the manufacture selected to work on his machine and know it will work and will probnably last another 40,000 hrs. Or, to figure out which LED is best, which one will fit, what current limiting resistor to use, how to orientate the led, how to mount it so that it will work with the encoder disk and read head and HOPE that it will work. And most importantly since the orignator did know what to do it seems much more practical to simply replace the bulb.
Dan
dmauch@...
www.camtronics-cnc.com

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Andrewdavid.mathison" <andrewdavid.mathison@...> wrote:
>
> In a vibrating environment, that 40,000 hours could easily become less than 500 hours. Could even become 1 hour in a worst case scenario...
>
> LEDs (and dropper resistors) are so cheap and are VERY insensitive to quite severe vibration.
>
> The tiny amount of extra work will be really well paid back, costs are almost nothing......
>
> But each must decide for himself what he does in such situations.......all we are doing here is showing everyone the various possibilities....
>
> .....but don't forget, lamps are slowly disappearing off this planet, in 10 years you might have real trouble finding one.....or even earlier!
>
> Greetings from
>
> Andy Mathison
>
> [Non-text portions of this message have been removed]
>




------------------------------------

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