On 5/19/2024 6:40 PM, Bob La Londe wrote:
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.
It's only the last couple of years I haven't ridden year round . My
wife says I'm gettin' old , but I don't believe her . It's just that I
have so much here to keep me busy ... and well , wrasslin' an 800 lb
touring bike around the yard to where it's parked isn't as much fun as
it used to be . The planned gravel work may change that .
--
Snag
"They may take our lives but
they'll never take our freedom."
William Wallace
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