HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
View Comments: Oldest First|Newest First|Threaded View
Page 1/3  >  >>
GlennA
User Rank
Gold
Check and Double Check ?
GlennA   5/4/2012 8:51:11 AM
NO RATINGS
It is interesting that none of your predecessors seemed to have taken the time to check to see if the rejected batteries were actually rejects.  There is an old saw about 'assuming'.  The problem is not 'assuming'.  The problem is not recognizing what assumptions you are making, and then not reviewing those assumptions to see if they are valid.

naperlou
User Rank
Blogger
Re: Check and Double Check ?
naperlou   5/4/2012 10:26:03 AM
NO RATINGS
John, as Gelnn said, this is a good example of not making assumptions.  Your predecessors all assumed that the test harness was fine.  That is often where there is a problem.  Again, check the whole chain starting from where the failure occured.

naperlou
User Rank
Blogger
Re: Check and Double Check ?
naperlou   5/4/2012 10:26:03 AM
NO RATINGS
John, as Gelnn said, this is a good example of not making assumptions.  Your predecessors all assumed that the test harness was fine.  That is often where there is a problem.  Again, check the whole chain starting from where the failure occured.

naperlou
User Rank
Blogger
Re: Check and Double Check ?
naperlou   5/4/2012 10:41:16 AM
NO RATINGS
John, as Gelnn said, this is a good example of not making assumptions.  Your predecessors all assumed that the test harness was fine.  That is often where there is a problem.  Again, check the whole chain starting from where the failure occured.

tekochip
User Rank
Platinum
Common Assumption
tekochip   5/4/2012 11:31:43 AM
NO RATINGS
It's a common assumption; people tend to believe that components are bad. Even when you have evidence to the contrary, it's easier to blame a component than a process or a tool. This issue is magnified when you have a marginal design, one that only works when a component is at its nominal rather than one end of the tolerance. I had an issue with a board that would not come out of Reset because the supervisory chip was holding the part in Reset. Technicians, the Production Manager, even Purchasing all believed that the supervisory chip was at fault because they could replace the chip and the circuit would come to life. A quick look at the spec. sheet showed that the pull-up resistor used for the supervisory chip was far too weak. Even after demonstrating that components once removed as failed were now operating properly, they refused to believe that the problem was not a faulty component, after all, the circuit had worked through two years of production without issue. I guess the cure would have been telling them that the pull-up resistor was a faulty component and needed to be replaced.


ScotCan
User Rank
Platinum
Re: Check and Double Check ?
ScotCan   5/4/2012 4:15:54 PM
NO RATINGS
To be fair to the previous investigators, none of them were trouble shooters...they were parachuted into a situation which was sporadic in nature because of the two sets of tooling which could be installed in a random fashion. In Liaison Engineering, when something goes wrong you have to come up with a fix "toute suite"...management expects fast answers even 'though they look down their noses at the "Quick Fix" crowd (Liaison Engineers).

ScotCan
User Rank
Platinum
Re: Common Assumption
ScotCan   5/4/2012 4:21:03 PM
NO RATINGS
Yes, that happens often. Another example... quite common...was the disgruntled consumer who complained that a brand new set of batteries for his flashlight were no good. We changed a blown bulb for him and hel calmed down.

ScotCan
User Rank
Platinum
Re: Check and Double Check ?
ScotCan   5/4/2012 4:27:42 PM
NO RATINGS
The rate at which the cells were produced provided very little time to troubleshoot, and policy was to make up the shortfall where suspect cells were concerned, quarantine the defects and pick up on their disposition later. For some reason management left me to my own devices and I could work at a rate that suited me instead of being under pressure.

GlennA
User Rank
Gold
Re: Check and Double Check ?
GlennA   5/4/2012 5:27:18 PM
NO RATINGS
Another variable may have been your testing the rejected parts during the operators' break time.  If you had instead tried to take 'production' time to do the testing you may not have been allowed the time you needed.

ScotCan
User Rank
Platinum
Re: Check and Double Check ?
ScotCan   5/4/2012 5:34:43 PM
NO RATINGS
That is very true. There is no way that time would have been allocated for troubleshooting during production. In fact several of the gizmos I designed for in process trouble shooting had to be carefully designed such that if production supervision called for their removal they could be removed on the fly without interruption to the line flow. 

Page 1/3  >  >>


Partner Zone
Latest Analysis
From pitchers and forwards to quarterbacks and defensemen, we offer a peek at some of the more memorable engineers in sports history.
IBM announced it is dedicating $3 billion of funding over the next five years to research and development of new processor technologies.
A soundproofing invention called Acoustiblok recently won a television challenge to silence an air horn with only a fraction of an inch of polymer material.
Rethink Robotics has upgraded Baxter the Robot so it can be easily trained by co-workers who simply show the robot how to move.
Robots came into their own in the 1970s. Gone were the low-budget black-and-white B movies. Now robots roamed in full-color feature films with A-list actors.
More:Blogs|News
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 21 - 25, Design Products With Bluetooth Low Energy
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


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.
Next Class: August 12 - 14
Sponsored by igus
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