HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Newest First|Oldest First|Threaded View
Page 1/3  >  >>
Cadman-LT
User Rank
Platinum
Re: Charger
Cadman-LT   5/20/2012 8:53:43 PM
NO RATINGS
Actually I have 2 chargers. One will say yes and no depending on the day, and the other always says yes(green light). It's very annoying and I wish I had an answer as to why this happens. Either way, the batteries work...I just never am sure to trust if they are fully charged or not. I am about to just get all new batteries and if the chargers say bad...toss the charger.

Cadman-LT
User Rank
Platinum
Charger
Cadman-LT   5/20/2012 8:32:04 PM
NO RATINGS
I have a battery charger that sometimes says my batteries are fried and sometimes they get the green light. I'd like to know why that happens.

Cadman-LT
User Rank
Platinum
Seems Obvious
Cadman-LT   5/20/2012 8:30:06 PM
NO RATINGS
Your solution seems so obvious, yet if there is no one there to explore the problem people just believe the machine they are told to I suppose.

William K.
User Rank
Platinum
Re: Case of the failing c cells.
William K.   5/18/2012 3:02:45 PM
NO RATINGS
Monitoring failures for each test position is usually mandatory for quite a few organizations. Others just monitor for three in a row on the whole machine. The reason is that in an automated line there could be a test fixture failure and it could result in a shift's worth of rejects when there was nothing wrong with the parts. So it is very good economics.

tekochip
User Rank
Platinum
Re: Case of the failing c cells.
tekochip   5/18/2012 10:17:29 AM
NO RATINGS
Collecting stats on which position failed is a great idea William.

William K.
User Rank
Platinum
Case of the failing c cells.
William K.   5/17/2012 9:27:32 PM
NO RATINGS
I have designed a lot of industrial testing machines and one common feature on many of them was code to detect three-in-a-row failures at any test position. That would either set a warning flag or stop the machine, since the processes were stable enough to make 3 in a row faults be a warning about some kind of process deviation problem. Of course if the tester did not record which fixture position the faults were in then it would never have spotted the problem. 

But it was certainly good detective work to locate the cause.

Ann R. Thryft
User Rank
Blogger
Re: Fix the Process and not the Part
Ann R. Thryft   5/8/2012 7:19:38 PM
NO RATINGS

This Sherlock reminds me of some things I heard when reporting on machine vision and inspection equipment. Mainly, how do you tell when the test/inspection equipment is the cause of a failure, and not the part? The big automated production and assembly systems have the ability to gather data, via software, which can be aided by the use of machine vision, to allow just that. But it all has to be configured correctly, and that takes a lot of time and energy. I heard from MV vendors that often that doesn't get done.


JimT@Future-Product-Innovations
User Rank
Blogger
Fix the Process and not the Part
JimT@Future-Product-Innovations   5/8/2012 1:09:48 PM
NO RATINGS

When part & component designers experience fit problems with their designed parts, they often point a finger at the tooling & mold engineers; "must be out of spec ; making bad parts".

When industrial automation engineers experience testing and analysis problems, they often point a finger at the component engineers; "must be a design flaw; back to the drawing board".

Then tooling & mold engineers experience trouble getting mold cavities to spec, they often point a finger at faulty heavy equipment manufacturers; "the CNC has slop in the indexing plate".

Truth be told to all, problems and anomalies can exist in every aspect, and looking at yourself first can save a lot of time and embarrassment. 

We used to have a mission statement: "Fix the Process and not the Part".  It tought a lot out looking at issues from a system level

ScotCan
User Rank
Platinum
Re: Precise failure mechanism?
ScotCan   5/8/2012 9:57:11 AM
NO RATINGS
Apologies for keeping you hanging...the canted condition caused bad or high resistance contact and the test registered as a failure. The observation that the test position was canted jogged my memory about other tests I had done varying the terminal contact which led to a wide variance in test results.

3drob
User Rank
Platinum
Re: Check and Double Check ?
3drob   5/8/2012 8:22:07 AM
NO RATINGS
I appreciate that you want to be fair, but step # 1 in ANY endeavor (Engineering or other) is to identify the task or requirement.  In this case, to identify what kind of failure you are investigating (luckily there was a quar. set of failed batteries to test).

If you manually test your failed bin of parts and the failure rate matches the expected (hopefully low) failure rate, then NDF (no defect found).  Of course, you want to cut a few "good" ones apart to make sure there are no latent or intermittent problems before you announce to your boss NDF.  Task identified:  find out why good batteries tested bad.

Which is what the author did, which is what makes this one a good story.  Kudo's.

Page 1/3  >  >>


Partner Zone
Latest Analysis
A bold, gold, open-air coupe may not be the ticket to automotive nirvana for every consumer, but Lexus’ LF-C2 concept car certainly turned heads at the recent Los Angeles Auto Show. What’s more, it may provide a glimpse of the luxury automaker’s future.
Perhaps you didn't know that there are a variety of classes, both live and archived, offered via the Design News Continuing Education Center (CEC) sponsored by Digi-Key? The best part – they are free!
Engineer comic Don McMillan explains the fun engineers have with team-building exercises. Can you relate?
The complexity of diesel engines means optimizing their performance requires a large amount of experimentation. Computational fluid dynamics (CFD) is a very useful and intuitive tool in this, and cold flow analysis using CFD is an ideal approach to study the flow characteristics without going into the details of chemical reactions occurring during the combustion.
The damage to Sony from the cyber attack seems to have been heightened by failure to follow two basic security rules.
More:Blogs|News
Design News Webinar Series
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
11/6/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jan 12 - 16, Programmable Logic - How do they do that?
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service