Today's Message Index:
----------------------
1. 05:57 AM - Re: Lead-Free Solders (Jim McBurney)
2. 08:57 AM - Re: Lead-Free Solders (Robert L. Nuckolls, III)
3. 08:57 AM - Re: Broken Low Voltage Module (Robert L. Nuckolls, III)
4. 10:35 AM - Re: Broken Low Voltage Module (Bill Bradburry)
5. 11:03 AM - Thermocouple wire (Dennis Jones)
6. 11:18 AM - Slow make/break contacts (David E. Nelson)
7. 04:47 PM - Re: Slow make/break contacts (Robert L. Nuckolls, III)
8. 05:00 PM - Re: Thermocouple wire (Robert L. Nuckolls, III)
9. 05:14 PM - Re: Thermocouple wire (BobsV35B@aol.com)
10. 05:50 PM - Re: Thermocouple wire (Paul Kuntz)
11. 06:08 PM - Re: Thermocouple wire (ROGER & JEAN CURTIS)
12. 06:50 PM - Re: Thermocouple wire (Bob White)
13. 07:13 PM - Thermocouple wire (Dennis Jones)
14. 08:21 PM - Re: Thermocouple wire (Robert L. Nuckolls, III)
15. 08:27 PM - Re: Thermocouple wire (Robert L. Nuckolls, III)
Message 1
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Subject: | Re: Lead-Free Solders |
I agree with you, Bob, that lead-free isn't the best way to go. However,
it's getting harder and harder to get past the "tree-huggers". Notice how
often you see "RoHS" in the catalogs anymore.
Do not archive
Blue skies and tailwinds
Jim
CH-801
DeltaHawk diesel
Augusta GA
90% done, 90% left
Message 2
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Subject: | Re: Lead-Free Solders |
At 08:53 AM 6/17/2008 -0400, you wrote:
>
>I agree with you, Bob, that lead-free isn't the best way to go. However,
>it's getting harder and harder to get past the "tree-huggers". Notice how
>often you see "RoHS" in the catalogs anymore.
>
>Do not archive
>
>Blue skies and tailwinds
Yes, but the RoHS components solder down very nicely
with good ol' 63/37. I probably have a lifetime supply
of the "good stuff" on my shelves.
Now, this DOES raise the specter of tin-whiskers on
components that are built to RoHS standards even when
they're assembled to the product with 63/37.
Fortunately, these experiences are rare. We've had
hot tin dipped, closely spaced relay terminals on our
GA aircraft for decades. 99.9% of the time, any whisker
that might have offered a potential for system malfunction
simply gets burned away.
Of course, not the case with micro-electronics. In this
case, it appears that conformal coatings have held the
Whisker Dragon at bay.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 3
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Subject: | Re: Broken Low Voltage Module |
At 10:54 PM 6/16/2008 -0400, you wrote:
><bbradburry@bellsouth.net>
>
>Bob,
>I sent the board in a couple of weeks ago. It should have been waiting for
>you when you returned from your vacation to California. I never heard if
>you found it ok.
>
>Have you had a chance to take a look at it, and if so, what did you
>discover?
>
>Bill B
It's laying on the desk right in front of me. I was thinking
this morning that I could probably get to it this evening.
I've been on travel quite a bit but there's a breathing spell
coming up.
Bob . . .
Message 4
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Subject: | Broken Low Voltage Module |
Great!
Thanks Bob!
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Tuesday, June 17, 2008 11:55 AM
Subject: Re: AeroElectric-List: Broken Low Voltage Module
--> <nuckolls.bob@cox.net>
At 10:54 PM 6/16/2008 -0400, you wrote:
><bbradburry@bellsouth.net>
>
>Bob,
>I sent the board in a couple of weeks ago. It should have been waiting
>for you when you returned from your vacation to California. I never
>heard if you found it ok.
>
>Have you had a chance to take a look at it, and if so, what did you
>discover?
>
>Bill B
It's laying on the desk right in front of me. I was thinking
this morning that I could probably get to it this evening.
I've been on travel quite a bit but there's a breathing spell
coming up.
Bob . . .
Message 5
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Subject: | Thermocouple wire |
What is the function of "serving thermocouple wire".
Jonsey
Message 6
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Subject: | Slow make/break contacts |
Hi Bob,
While I was looking for the S700 series specs on Carling's www site, I
came around a line of switches (F Series, in particular) with "slow
make/break" contacts. This struck me as odd. Under what circumstances
would one want to spread the contacts slowly?
Thank you,
/\/elson
~~ Lately my memory seems to be like a steel trap .... without any spring. ~~
Message 7
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Subject: | Re: Slow make/break contacts |
At 01:15 PM 6/17/2008 -0500, you wrote:
><david.nelson@pobox.com>
>
>
>Hi Bob,
>
>While I was looking for the S700 series specs on Carling's www site, I
>came around a line of switches (F Series, in particular) with "slow
>make/break" contacts. This struck me as odd. Under what circumstances
>would one want to spread the contacts slowly?
It's not that you WANT to, it's an artifact of an inexpensive
switch. You can buy switches with very fast contact spreading
velocities and fast/forceful closing characteristics but these
will use a mechanism that is much more complicated than:
http://aeroelectric.com/Pictures/Switches/Carling_Cutaway.jpg
While the el-cheeso switch does have an spring loaded, over-center
action, it's still classed as a slow make-break device because
you can "tease" it open and "sneak up" on a closure by holding
the handle and preventing it from exploiting the over-center
behavior.
In a fast make/break device, you can't tease it. Once past the
point of no return, the switch snaps to the new position with
gusto.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 8
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Subject: | Re: Thermocouple wire |
At 12:59 PM 6/17/2008 -0500, you wrote:
>What is the function of "serving thermocouple wire".
>
>Jonsey
Your use of the word "serving" doesn't bring
up an image for me. I think I've heard the term
used but its meaning escapes me at the moment.
Bob . . .
Message 9
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Subject: | Re: Thermocouple wire |
Hmmmm!
When on a sailboat, "serving" something means we wrap it in a protective
covering. Any possibilities there?
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
628 West 86th Street
Downers Grove, IL 60516
630 985-8502
Stearman N3977A
Brookeridge Air Park LL22
In a message dated 6/17/2008 7:02:11 P.M. Central Daylight Time,
nuckolls.bob@cox.net writes:
--> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
<nuckolls.bob@cox.net>
At 12:59 PM 6/17/2008 -0500, you wrote:
>What is the function of "serving thermocouple wire".
>
>Jonsey
Your use of the word "serving" doesn't bring
up an image for me. I think I've heard the term
used but its meaning escapes me at the moment.
Bob . . .
**************Gas prices getting you down? Search AOL Autos for
fuel-efficient used cars. (http://autos.aol.com/used?ncid=aolaut00050000000007)
Message 10
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Subject: | Re: Thermocouple wire |
That's what I was thinking -- in nautical use, serving means to wrap a large
line with a smaller line or with cloth to protect it from chafing. So, when
a wire is significantly longer than required, the excess is often folded
back on itself a few times, then the end wrapped (served) around the folded
portion to take up the extra length neatly. In the case of thermocouple
wire, the application would be to get rid of the slack in the wire without
having to cut it and thereby introduce additional dissimilar material
junctions in the middle of the wire. Bob has talked many times about
joining or splicing thermocouple wires so as not to influence the properties
of its temperature detection ability, but I suspect the idea of "serving"
the wire rather than remove the exess is another bit of electrical folklore
that advises people to never cut and rejoin thermocouple cable.
Cheers,
Paul Kuntz
On 6/17/08, BobsV35B@aol.com <BobsV35B@aol.com> wrote:
>
> Hmmmm!
>
> When on a sailboat, "serving" something means we wrap it in a protective
> covering. Any possibilities there?
>
> Happy Skies,
>
> Old Bob
> AKA
> Bob Siegfried
> Ancient Aviator
> 628 West 86th Street
> Downers Grove, IL 60516
> 630 985-8502
> Stearman N3977A
> Brookeridge Air Park LL22
>
> In a message dated 6/17/2008 7:02:11 P.M. Central Daylight Time,
> nuckolls.bob@cox.net writes:
>
> nuckolls.bob@cox.net>
>
> At 12:59 PM 6/17/2008 -0500, you wrote:
> >What is the function of "serving thermocouple wire".
> >
> >Jonsey
>
> Your use of the word "serving" doesn't bring
> up an image for me. I think I've heard the term
> used but its meaning escapes me at the moment.
>
> Bob . . .
>
>
> ------------------------------
> Gas prices getting you down? Search AOL Autos for fuel-efficient used cars<http://autos.aol.com/used?ncid=aolaut00050000000007>
> .
>
> *
>
> *
>
>
Message 11
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Subject: | Thermocouple wire |
Hi Jonsey,
Can you please restate your question and give us some reference context??
Roger
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dennis
Jones
Sent: Tuesday, June 17, 2008 1:59 PM
Subject: AeroElectric-List: Thermocouple wire
What is the function of "serving thermocouple wire".
Jonsey
Message 12
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Subject: | Re: Thermocouple wire |
On Tue, 17 Jun 2008 20:11:44 EDT
BobsV35B@aol.com wrote:
> Hmmmm!
>
> When on a sailboat, "serving" something means we wrap it in a protective
> covering. Any possibilities there?
>
> Happy Skies,
>
> Old Bob
> AKA
> Bob Siegfried
> Ancient Aviator
> 628 West 86th Street
> Downers Grove, IL 60516
> 630 985-8502
> Stearman N3977A
> Brookeridge Air Park LL22
>
>
> In a message dated 6/17/2008 7:02:11 P.M. Central Daylight Time,
> nuckolls.bob@cox.net writes:
>
> --> AeroElectric-List message posted by: "Robert L. Nuckolls, III"
> <nuckolls.bob@cox.net>
>
> At 12:59 PM 6/17/2008 -0500, you wrote:
> >What is the function of "serving thermocouple wire".
> >
> >Jonsey
>
> Your use of the word "serving" doesn't bring
> up an image for me. I think I've heard the term
> used but its meaning escapes me at the moment.
>
> Bob . . .
>
>
>
>
>
Interestingly enough, the only result from Google for "serving
thermocouple wire" is to AC-21-99, Aircraft Wiring and Bonding
Section 2 Chapter 16, Figure 16-14 shows the procedure and seems to
match with the nautical terminology although I've don't recall hearing
it before in reference to wiring.
(http://www.casa.gov.au/rules/1998casr/021/021c99s2c16.pdf)
Bob W. (Hanging on to the "bitter end".)
Do not archive
--
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
3.8 Hours Total Time and holding
Cables for your rotary installation - http://roblinstores.com/cables/
Message 13
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Subject: | Thermocouple wire |
I found a reference in AC 21-99 that states that the thermocouple wire
is served at the branching point using nylon or waxed cotton cord in
cool areas and fiberglass cord in hot areas. It also shows how to do the
wrapping. It also references using clear lacquer at the flat base area
covering 12.7 mm. The serving will prevent unraveling of the outer
jacket.
Jonsey
Message 14
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Subject: | Re: Thermocouple wire |
At 09:10 PM 6/17/2008 -0500, you wrote:
>I found a reference in AC 21-99 that states that the thermocouple wire is
>served at the branching point using nylon or waxed cotton cord in cool
>areas and fiberglass cord in hot areas. It also shows how to do the
>wrapping. It also references using clear lacquer at the flat base area
>covering 12.7 mm. The serving will prevent unraveling of the outer jacket.
>
Aha! Yes, SOME thermocouple wires are covered in a woven
fiberglas jacket and they will unravel with time and look
funky. I have used the dacron flat lace to wrap the outer
jacket and prevent fraying. You can use a short piece of
heatshrink for this task too. As far as 'extra' wire, you
can coil it up if you're loath to cut it. But I generally
cut to finished length and put a connector on it.
My favorite TC wires are the TT-K series from Omega found
at:
http://www.omega.com/ppt/pptsc.asp?ref=XC_K_TC_WIRE&Nav=temh06
Neoflon
PFA
(HighPerformance)
20 TT-K-20 Solid
20 TT-K-20S 7 x 28
22 TT-K-22S 7 x 30
24 TT-K-24 Solid
24 TT-K-24S 7 x 32
30 TT-K-30 Solid
36 TT-K-36 Solid
40 TT-K-40 Solid
This is a Tefzel-like insulation that is easy to strip,
reasonably robust and user friendly in the tiny (36 and 40AWG)
wire sizes. This stuff won't unravel.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 15
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Subject: | Re: Thermocouple wire |
> >
>Interestingly enough, the only result from Google for "serving
>thermocouple wire" is to AC-21-99, Aircraft Wiring and Bonding
>
>Section 2 Chapter 16, Figure 16-14 shows the procedure and seems to
>match with the nautical terminology although I've don't recall hearing
>it before in reference to wiring.
>(http://www.casa.gov.au/rules/1998casr/021/021c99s2c16.pdf)
>
>Bob W. (Hanging on to the "bitter end".)
Interesting. This is a rather dated document that touches on TC
wiring techniques typical of 1930 to 1950 when self-powered
TC temperature instruments were common. These tended to have
large AWG wires of specific length that could not be
altered without affecting calibration of the instrument.
They also did not benefit from modern plastic insulations.
Modern TC signal conditioners draw pico-amperes of Seebeck
voltage, ANY gage wire of ANY length will produce satisfactory
performance. Yeah kids, that's how our grandpas used to do
it!
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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