HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Rob Spiegel
User Rank
Blogger
Re: Top-notch detective work
Rob Spiegel   12/30/2011 2:32:19 PM
NO RATINGS
Good point, Jljavris. I would think the repair that was done that violated the manufacturer's instructions would face legitimate liability issues.

BobGroh
User Rank
Platinum
Re: Forklift fire
BobGroh   11/4/2011 9:15:30 PM
NO RATINGS
I am always surprised and amazed at how much energy you can get out of today's batteries and not just the bigger one's like the forklift had but, for example, even that lowly little 9V battery that we use in our smoke alarms and transistor radios.

Several years ago, I was evaluating a new device in an industrial environment. To test the device, I had a shop made electronic test device which used a simple little alkaline 9V battery (size 522) for power.  Because I didn't want to have to terminate my testing if the battery in the test device ran low, I carried along a spare battery. I just stuck the replacement spare battery in my pocket and carried on with my testing.

The morning wore on and I was busy taking data. My hand brushed the coveralls where the pocket was and, to my surprise, it felt warm.  In fact, it felt darn right warm!  I reached in my pocket and yanked out the spare battery ... and burned my fingers!  I threw the battery down on the grating and wondered what the heck had caused that! 

Looking at the terminals on the battery, I noticed two discolored spots on the the brass.  I also emptied out my pocket and found a 'warm' quarter.  Ah, ha, said I to myself - the quarter must have worked it's way across the battery terminals, causing a short which caused internal heating of the battery.  I gingerly picked up the now somewhat cool battery, placed the quarter across the terminals and the battery very rapidly started to heat up again.

Lesson learned: even small batteries have the potential to heat up considerably when abused.  I never carried a spare battery in a pocket with anything else metallic in it and I always, when disposing of ANY battery, wrap it in tape so the chances of it shorting to something else are pretty much non-existant.

oldtimer8080
User Rank
Gold
Secure Start/Start Stick facts
oldtimer8080   11/3/2011 5:33:40 PM
NO RATINGS
At Bolder Technologies, we built auxilary/emergency starter power cells.

Our SecureStart could power my XJ12 starter ( ~400A ) for 10-12 seconds.

Your regular 27F sized vehicle battery has much more power available and can deliver it all in the space of a few minutes..

The new generation of hybrid and EVs have a new set of rules when it comes to vehicle accidents.

Every EV/Hybrid should have a full current master switch to kill the battery pack voltages.

The BRS should be as visible as they are in computer rooms. The life you save may be your own,,,

 

 

 

 

jljarvis
User Rank
Gold
Re: Top-notch detective work
jljarvis   11/3/2011 3:11:24 PM
NO RATINGS
Question is, did the insurance company go after the repair shop whose

work violated the manufacturer's instructions, and ultimately caused the fire?

 



William K.
User Rank
Platinum
Did the forklift start the fire
William K.   11/2/2011 7:47:55 PM
The amount of power that a vehicle battery can deliver for a short period of time is quite remarkable. Even the small 7amp-hour batteries can deliver a hundred amps for as much as 30 seconds. The larger starting-duty batteries can deliver over a thousand amps for a while. 

Because of this ability to deliver so much current it is mandatory that proper precautions be taken to avoid short circuits of the battery wiring. If the installer of the battery cable had done the job correctly, or even if they had added an extra layer of protection, the disaster would have been avoided.

This provides all of us with a reminder about safety requirements in battery wiring designs. 

Beth Stackpole
User Rank
Blogger
Top-notch detective work
Beth Stackpole   11/2/2011 9:23:05 AM
What a relief for the store owner that they were able to settle the claim. Just goes to show what a sound engineering background can help uncover.



Partner Zone
Latest Analysis
Advertised as the "Most Powerful Tablet Under $100," the Kindle Fire HD 6 was too tempting for the team at iFixit to pass up. Join us to find out if inexpensive means cheap, irreparable, or just down right economical. It's teardown time!
The first photos made with a 3D-printed telescope are here and they're not as fuzzy as you might expect. A team from the University of Sheffield beat NASA to the goal. The photos of the Moon were made with a reflecting telescope that cost the research team 100 to make (about $161 US).
At Medical Design & Manufacturing Midwest, Joe Wascow told Design News how Optimal Design prototyped a machine that captures the wing-beat of a duck.
The increased adoption of wireless technology for mission-critical applications has revved up the global market for dynamic electronic general purpose (GP) test equipment. As the link between cloud networks and devices -- smartphones, tablets, and notebooks -- results in more complex devices under test, the demand for radio frequency test equipment is starting to intensify.
Much of the research on lithium-ion batteries is focused on how to make the batteries charge more quickly and last longer than they currently do, work that would significantly improve the experience of mobile device users, as well EV and hybrid car drivers. Researchers in Singapore have come up with what seems like the best solution so far -- a battery that can recharge itself in mere minutes and has a potential lifespan of 20 years.
More:Blogs|News
Design News Webinar Series
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
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
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Oct 20 - 24, How to Design & Build an Embedded Web Server: An Embedded TCP/IP Tutorial
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: 10/28-10/30 11:00 AM
Sponsored by Stratasys
Next Class: 10/28-10/30 2:00 PM
Sponsored by Gates Corporation
Next Class: 11/11-11/13 2:00 PM
Sponsored by Littelfuse
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