Today's Message Index:
----------------------
1. 04:37 AM - Re: Units puzzle (Carlos Trigo)
2. 06:02 AM - Re: Re: Units puzzle (Robert L. Nuckolls, III)
3. 06:05 AM - Re: MAXI fuses for alternator b-leads (Robert L. Nuckolls, III)
4. 08:47 AM - Re: Units (Gilles Thesee)
5. 01:58 PM - Re: Re: Units (OldBob Siegfried)
6. 02:30 PM - Re: Units (Gilles Thesee)
7. 03:58 PM - lighted toggle switches (Ernest Christley)
8. 05:44 PM - Re: lighted toggle switches (Vincent S. Himsl)
9. 07:35 PM - METRIC! (Fergus Kyle)
Message 1
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Subject: | Re: Units puzzle |
> <kellym@aviating.com>
>
> Yeah, sure, the metric system is terrific, except, they screwed up a lot
> of units. Temperature..too big, so that everything has to be expressed as
> a decimal instead of integers. Pressure, same thing, at least for tires.
> Torque, ditto. Distance..ditto. Centimeters are too small, meters are too
> big. Oh, and the real big deal....all land in the US is titled in English
> units that require hard conversion of every legal title document at
> horrendous billions of dollars. The transportation industry tried to
> convert. Because of the real estate involved, two sets of plans had to be
> done for every project at a huge waste of money, with subsequent high
> likelihood of mistakes, that could and did happen. FHWA and many states
> came to their senses and abandoned the effort. Then you have the
> bastardized METAR system, that winds up using English, nautical and metric
> units all in the same weather sequence. What a load of crap! Remember that
> 90% of all flights in the world occur within the US border.........so why
> in the world should they be done to foreign standards? You gonna pay to
> replace every altimeter, VSI airspeed and temperature gauges with metric?
> Not me.
> Machining and hardware manufacture is just a small piece of the
> puzzle...but you already knew that.
I don't want to contribute to an "USA versus the rest of the World"
discussion, neither I have anything against you Kelly (whom I don't know),
but the text you wrote is an excellent example of expression of a typical
"Yankee-Uncle Sam" position which makes the USA to be hated by the rest of
the world. And normally, history tell us that, that's the beginning of the
"End of an Empire".
Let me add that I love your country, your people, most of your system of
life (democracy, justice, economy), but when somebody says something like
"... 90% of all flights in the world occur within the US
> border.........so why in the world should they be done to foreign
> standards?", which demonstrates what has been called as "American
> Egocentrism", you begin to loose your reason.
My opinion about this System of Units discussion is that America should
evaluate precisely the economic impact of such a change, which will have
costs and benefices, and decide what to do rationally, leaving emotional
issues apart.
It is obvious that we no longer trade horses for cereals, when the English
system was invented, and that a decimal system of units is far superior, but
since "there ain't such a thing like a free lunch", the decision must be
made based on economic grounds
Carlos
Message 2
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Subject: | Re: Units puzzle |
At 12:31 PM 11/18/2006 +0000, you wrote:
><trigo@mail.telepac.pt>
>
>I don't want to contribute to an "USA versus the rest of the World"
>discussion, neither I have anything against you Kelly (whom I don't know),
>but the text you wrote is an excellent example of expression of a typical
>"Yankee-Uncle Sam" position which makes the USA to be hated by the rest of
>the world. And normally, history tell us that, that's the beginning of the
>"End of an Empire".
>Let me add that I love your country, your people, most of your system of
>life (democracy, justice, economy), but when somebody says something like
>"... 90% of all flights in the world occur within the US
>>border.........so why in the world should they be done to foreign
>>standards?", which demonstrates what has been called as "American
>>Egocentrism", you begin to loose your reason.
>My opinion about this System of Units discussion is that America should
>evaluate precisely the economic impact of such a change, which will have
>costs and benefices, and decide what to do rationally, leaving emotional
>issues apart.
>It is obvious that we no longer trade horses for cereals, when the English
>system was invented, and that a decimal system of units is far superior,
>but since "there ain't such a thing like a free lunch", the decision must
>be made based on economic grounds.
Absolutely . . . and as long as there is no intent to
defraud or to deprive anyone of liberty, each supplier
of services is free to make what ever deal they wish
with prospective consumers of those services. If one
wishes NOT to own a product crafted under their favorite
dogma, they're free to not buy it. And certainly, anyone is
free to express whatever opinions they might have on
the matter.
But the fundamental question remains: What value is added
to this or any other venue by the exchange of personal
judgements couched in hyperbolic and pejorative ideas
and words?
It's a certainty that we're not going to solve (or even
exert a favorable influence upon) the matter here. Suppose
we leave weighty discussions on world order to others.
It's a certainty that they'll produce no more influence
on the direction and outcome than we. I'll
suggest we get back to the business of refining the
best we know how to do
Bob . . .
Message 3
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Subject: | Re: MAXI fuses for alternator b-leads |
At 09:15 PM 11/17/2006 -0500, you wrote:
>
>Bill
>You might find marine Maxi fuse holders useful. I think mine is from Blue
>Sea and as I recall it has 3/16" bolts for ring terminals so that any size
>wire is easy to use. The bolts also increase the grip force on the fuse legs.
>Ken
Ken, thanks for the heads-up on this. Folks, Ken is referring
to the product described at:
http://preview.tinyurl.com/yh8swz
It's a bit more bulky than the inline fuse holder but does
offer a solution to the wire attachment questions.
Bob . . .
Message 4
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Bob and all,
> I'll
> suggest we get back to the business of refining the
> best we know how to do
>
There has been a discussion on French homebuilding list servers, about
US thread and drill bit sizes.
I compiled the following drill bit conversion table to inches and
millimeters. :
http://contrails.free.fr/article_drill_size_en.php
from different sources and re-computed fractional inches
I would welcome any feedback from listers here, about possible errors,
omissions, etc.
Thanks,
Regards,
Gilles Thesee
Grenoble, France
http://contrails.free.fr
Message 5
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Good Afternoon Gilles,
You are very kind to be sharing this data with us, but
I wonder if it wouldn't be better if the inch based
sizes were listed down to the closest ten thousandth
of an inch rather than to the closest thousandth?
Back when I was gainfully employed as a flunky in a
tool and die shop, the pros constantly worked to the
closest "tenth" meaning one ten thousandth of an inch.
When making custom fits, they occasionally worked to
even tighter tolerances.
One one thousandth of an inch was considered a very
rough approximation!
As I am sure you have noted, you list several of the
number sized drills as having identical dimensions due
to their being rounded off to the closest one
thousandth of an inch.
Back before GAMI managed to get their balanced
injection nozzles approved, I was boring my own.
In those days, I would buy a package of small "number"
drills of one size and note that those drills would
vary in size by two or three tenths (One ten
thousandth of an inch). I found that it did make a
difference which drill I used as to how my injection
nozzles flowed.
While I am certainly NOT a good machinist, I do know
that, even in our phase of aviation, one ten
thousandth of an inch can make a difference.
Thanks again and:
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
--- Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
wrote:
> Thesee <Gilles.Thesee@ac-grenoble.fr>
>
> Bob and all,
>
> > I'll
> > suggest we get back to the business of refining
> the
> > best we know how to do
> >
> There has been a discussion on French homebuilding
> list servers, about
> US thread and drill bit sizes.
> I compiled the following drill bit conversion table
> to inches and
> millimeters. :
>
> http://contrails.free.fr/article_drill_size_en.php
>
> from different sources and re-computed fractional
> inches
> I would welcome any feedback from listers here,
> about possible errors,
> omissions, etc.
>
> Thanks,
>
> Regards,
> Gilles Thesee
> Grenoble, France
> http://contrails.free.fr
>
>
>
>
>
>
>
>
>
>
> Click on
> about
> provided
> www.buildersbooks.com
> Admin.
>
> browse
> Subscriptions page,
> FAQ,
> http://www.matronics.com/Navigator?AeroElectric-List
>
>
>
>
>
Message 6
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Bob,
>
> As I am sure you have noted, you list several of the
> number sized drills as having identical dimensions due
> to their being rounded off to the closest one
> thousandth of an inch.
>
Thank you for your message.
I must confess that my mind was set on the millimeter values.
Indeed, we consider one thousandth of an inch as large tolerance, as it
is 2.5 "hundredth" of a millimeter.
I'll correct the table.
Regards,
Gilles
http://contrails.free.fr
Message 7
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Subject: | lighted toggle switches |
Bob,
I've settled on lighted toggle switches made by Lumex, with a plan to
run all the LEDs through a dimmer circuit composed of one of those MPJA
DC motor controllers. Now that I'm about to put them all together, I'm
not sure how the wiring is supposed to go. A diagram of the switch's
internal circuit can be found at
http://www.lumex.com/spec.asp?p_n=CLS-TC11A12251B The diagram is on
the lower right of the page.
I thought that the switched circuit would be between the POWER and
GROUND terminals, and I would connect my dimmer power line to ACC. I'm
now thinking that the switched circuit will be between POWER and ACC,
and that I will have to modify the motor controller to cycle a
transistor that grounds the GROUND tab to dim the LEDs. Can you
please set me straight?
Message 8
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Subject: | lighted toggle switches |
Hello Ernest,
Examining the Lumex schematic, you run +12 VDC to the 'power' input, the ACC
pin to the device you wish to control, with the device going to ground.
You would connect the dimmer to the ground of the LED ground (adding
resistance to dim) and then ground the other side of the dimmer.
I too wish to use lighted LED switches (they make so much sense). However
looking at the switch wiring, it appears that the LED only lights when the
switch is in the 'ON' position. I want the LED lights to be lit when they
are off as well so I can find them in the dark.
Vince
RV8-Finish
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Ernest
Christley
Sent: Saturday, November 18, 2006 3:58 PM
Subject: AeroElectric-List: lighted toggle switches
<echristley@nc.rr.com>
Bob,
I've settled on lighted toggle switches made by Lumex, with a plan to
run all the LEDs through a dimmer circuit composed of one of those MPJA
DC motor controllers. Now that I'm about to put them all together, I'm
not sure how the wiring is supposed to go. A diagram of the switch's
internal circuit can be found at
http://www.lumex.com/spec.asp?p_n=CLS-TC11A12251B The diagram is on
the lower right of the page.
I thought that the switched circuit would be between the POWER and
GROUND terminals, and I would connect my dimmer power line to ACC. I'm
now thinking that the switched circuit will be between POWER and ACC,
and that I will have to modify the motor controller to cycle a
transistor that grounds the GROUND tab to dim the LEDs. Can you
please set me straight?
Message 9
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to BOB and ERIC,
I enjoy reading your epithets, one and another. It's a bit like
watching two goliaths (or mebbe even Universe Wrestling Finals), especially
when we read of the difficulties in changing systems.
[1] Ontario province followed the Uk in accepting A2 metric paper sizes,
and finally abandonned the practice after a number of years - not their
money!
[2] We've switched to kilometers - the Quebeckers are still trying tell
us how to pronounce them (by ignoring English pronunciation rules) - but we
still get speeding tickets......
[3] We're on Celsius - so what? Pilots have been translating in their
heads for 9 decades..... Try cruising in meters ASL.
[4] All these creaking Imperial-based milling machines aren't selling
ovewrseas are they?
[5] The Brits for all their 'forward-thinking' stance still drive in
....... miles(?)
[6] One old Brit sweetheart said, "Why don't they wait until all us old
folk are dead?"
Ferg Kyle
Europa A064 914 Classic
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