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From: Bob La Londe <none@none.com99>
Newsgroups: rec.crafts.metalworking
Subject: SNAG: Re: Got 4Ah, not 5Ah, battery 18V (20V) - done right thing?
Date: Sun, 19 May 2024 16:40:44 -0700
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On 5/19/2024 4:29 PM, Bob La Londe wrote:
> On 5/19/2024 4:17 PM, Jim Wilkins wrote:
>> "Bob La Londe"  wrote in message news:v2djrv$3hfus$1@dont-email.me...
>>
>> On 5/18/2024 7:33 PM, Jim Wilkins wrote:
>> ...
>>
>> I never was employed doing destructive testing, but I did spend a decade
>> or two doing low voltage communication contracting.  I learned there is
>> what they say, and there is what there is.  Usually what they say fell
>> short in my field, but sometimes it didn't.
>>
>> When they say an IR motion sensor will detect motion at 90 feet they
>> mean if ambient is below 70F and the subject is large and is running a
>> fever.  LOL.  They don't say if ambient is 90+ its virtually worthless.
>>
>> ---------------------
>> Most of the testing was to find and reject or reclassify parts that 
>> didn't meet specifications for companies that cared, or burn-in 
>> testing to weed out early failures by operating at elevated 
>> temperature for a week. The exact conditions were usually secret, I 
>> had to provide a range of adjustment. Sometimes there had to be 
>> provision for destructive failure, such as Chrysler Lean Burn engine 
>> controllers with components not rated for possible under-hood 
>> temperatures.
>>
>> Before Congress mandated emissions and fuel economy standards that 
>> needed electronic control to meet, the only electronic device in a car 
>> was the radio which the auto makers bought, they had to hire new 
>> engineers unfamiliar with the heat, water, dirt, salt and vibration, 
>> who took time to learn. I had the partial advantages of military 
>> electronic experience which solves those, in commercially unaffordable 
>> ways, plus a hands-on apprenticeship in custom electro-mechanical 
>> machine design. The engine compartment environment can be nearly as 
>> challenging as military aircraft specs, consider a snow plow driver in 
>> Alaska starting cold and diving full throttle into the deep snow in 
>> front of the truck, or splashing through an icy puddle.
>>
>> Heat in the South is another issue that's not so evident in Michigan. 
>> I know what Atlanta is like in summer.
>>
> 
> 
> Bell Labs had material test sites down here in the Sonoran Desert for 
> environmental testing.  Death Valley may be the only place in North 
> America more hostile than the low Sonoran Desert.  They had panels setup 
> with material samples affixed out along the southern rail line right of 
> way.  Maybe they still do (if they are still some form of Bell Labs).  I 
> haven't checked in a long time.
> 
> 
> 

Yes I used to ride year around in it too.

-- 
Bob La Londe
CNC Molds N Stuff


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