HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Sherlock Ohms

Old Ink Impedes CT Scanner Fix

NO RATINGS
View Comments: Oldest First|Newest First|Threaded View
Page 1/2  >  >>
Rob Spiegel
User Rank
Blogger
Too simple for smart
Rob Spiegel   4/23/2012 10:47:04 AM
NO RATINGS
This is what I love about the Sherlock Ohms postings. You can turn the equipment upsidedown to find the problem, but in the end, it was a line that had to be drawn darker. This is a common solution to difficult problems -- look at what was difficult at an earlier stage in the equipment's development.

Charles Murray
User Rank
Blogger
Re: Too simple for smart
Charles Murray   4/23/2012 8:29:05 PM
NO RATINGS
So they were able to fix a CT scanner by drawing a line with black ink...Sometimes, I think it takes a better "detective" to find find a simple solution, like this one.

Rob Spiegel
User Rank
Blogger
Re: Too simple for smart
Rob Spiegel   4/24/2012 12:21:36 PM
NO RATINGS
I agree, Chuck. Like many of the Sherlock Ohms blogs, it's hard to imagine how they figured out such an off-the-wall solution. It is certainly not intuitive. The trick here was remembering something odd from the past.

Noswad
User Rank
Gold
Shoddy repair work!
Noswad   4/24/2012 4:51:07 PM
NO RATINGS
Sounds like a bad way to repair something. Could they have not repaired the wheel with a permanent solution. They should have replaced the wheel with a new and good one.

If I were their manager, I would not have allowed that type of repair. It will come back to haunt someone else in the future.

Greg M. Jung
User Rank
Platinum
Corrective Action
Greg M. Jung   4/24/2012 9:15:26 PM
NO RATINGS
Good article. 

I guess in today's highly regulated environment, this temporary black pen fix would not be enough.  In addition to solving the problem immediately, a root-cause countermeasure would also be needed to be performed by the equipment manufacturer so this problem would not occur again years later.

William K.
User Rank
Platinum
Poor ink impededs CT scanner.
William K.   4/24/2012 10:04:24 PM
NO RATINGS
Insufficient contrast is a very subtle failure mode indeed. The system goes from functioning to intermittant to failed and nothing shows up as the cause. Hartridge has a similar problem with the linear encoders in their fuel injector system teststands, except that it is dirt, not fading. The normal fix is a new encoder for about $450, and two hours wait, and hope the new encoder is in stock. My cheap fix was to clean the scale in the encoder with denatured alcohol and a soft lense wipe tissue. Materials cost is about ten cents and the labor time is about five minutes and no recalibration is needed. But the profit is less, so the customer gets the _____.

Charles Murray
User Rank
Blogger
Re: Too simple for smart
Charles Murray   5/4/2012 6:57:11 PM
NO RATINGS
The author notes that this was a "temporary fix." I wonder what he used as a permanent fix.

Rob Spiegel
User Rank
Blogger
Re: Too simple for smart
Rob Spiegel   5/9/2012 12:48:24 PM
NO RATINGS
I would guess they went for a permanent stripe, since they would know that the improvised ink line would eventially fail, just as the frist improvised ink line failed.

Ann R. Thryft
User Rank
Blogger
Re: Too simple for smart
Ann R. Thryft   5/14/2012 3:14:16 PM
NO RATINGS
I'm also surprised that a temporary repair was made and not a permanent one, since it appears this is the second temporary repair.

Rob Spiegel
User Rank
Blogger
Re: Too simple for smart
Rob Spiegel   5/14/2012 4:06:57 PM
NO RATINGS
Yes, this is the second temporary repair. In some ways the first temporary repair is the most suprising since it sounds like it was done by the vendor during the installation process.

Page 1/2  >  >>
Partner Zone
More Blogs from Sherlock Ohms
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
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
9/25/2014 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.
Sep 22 - 26, MCU Software Development – A Step-by-Step Guide (Using a Real Eval Board)
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: September 30 - October 2
Sponsored by Altera
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