Digest for sci.electronics.repair@googlegroups.com - 17 updates in 4 topics

Madness <madness.mail@gmail.com>: Sep 03 12:10PM -0400

*BBBRRRAAAPPP!!!* *BLIP-BLIP-BLIP!* *SQUEEEEEEEEEEEEE!!!!*
M Philbrook <jamie_ka1lpa@charter.net>: Sep 03 12:35PM -0400

In article <ooh9a1$arm$1@dont-email.me>, madness.mail@gmail.com says...
 
> *BBBRRRAAAPPP!!!* *BLIP-BLIP-BLIP!* *SQUEEEEEEEEEEEEE!!!!*
 
and which end?
Robert Roland <fake@ddress.no>: Sep 02 10:32PM +0200

On Fri, 1 Sep 2017 12:58:20 -0700 (PDT), "pfjw@aol.com" <pfjw@aol.com>
wrote:
 
>Mars-type screw-up is, perhaps, not a bad thing.
 
There is also the "Gimli Glider" incident. Only due to tremendous luck
and pilot flying skill, nobody died.
--
RoRo
rickman <gnuarm@gmail.com>: Sep 02 06:37PM -0400

Robert Roland wrote on 9/2/2017 4:32 PM:
 
>> Mars-type screw-up is, perhaps, not a bad thing.
 
> There is also the "Gimli Glider" incident. Only due to tremendous luck
> and pilot flying skill, nobody died.
 
I found one account to be a good read with this...
 
"A crew of engineers from Winnipeg airport clambered into a van and headed
for Gimli to assess the damage. During transit, however, their vehicle
unexpectedly ran out of fuel, nearly ripping a hole in the delicate
space-irony continuum. "
 
https://www.damninteresting.com/the-gimli-glider/
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
amdx <nojunk@knology.net>: Sep 03 10:57AM -0500

On 9/1/2017 6:37 AM, Andy Burns wrote:
> oldschool@tubes.com wrote:
 
>> If we were using a metric system at that time, would they still be
>> called 45 rpm, or would there be some metric numbers used instead?
 
 
I'd rather pick my belly button lint than have any concern about this.
 
Mikek
Jeff Liebermann <jeffl@cruzio.com>: Sep 02 12:03PM -0700


>I don't remember that "people just would not go for it". I don't recall
>much resistance at all. I think the "resistance" was at other levels.
 
Yep. At the time (about 1975), I was working for a company that tried
to switch to metric. This was aided by having the drafting manager
and mechanical designer also serving on the metric conversion council
(or whatever it was called). At one point, we started sending metric
fabrication drawings to various vendors. They were immediately
returned. The problem wasn't understanding the new metric way of
doing things, it was that they would need to replace all their English
lead screws, measurement instruments, gauges blocks, programming, etc
before they could cut metal. They also claimed that they needed
considerable staff training to handle the change (because someone
tried to simultaneously switch to true position dimentioning). We
would need to wait until the shops converted before we could orders
parts in metric.
 
So, we went back to English units and waited for the "inevitable"
conversion that never happened. It seems that most of the other
customers followed the same pattern. They tried metric, failed, and
went back to English. So, we asked the various fab shops why the
delay? They answered that since everyone seemed to be going back to
using English measurements, they must have run into some problem with
metric. Therefore, the fab shop saw no reason to convert. After
getting approximately the same story from ALL our vendors, we gave up
in disgust.
 
"Why hasn't the U.S. adopted the metric system?"
<http://www.popsci.com/why-hasnt-us-adopted-metric-system>
 
The idea of decimal time has been around for centuries:
<https://en.wikipedia.org/wiki/Decimal_time>
The big problem is that time, astronomical, and navigational units
that are based on nautical miles, degrees, minutes, seconds, will end
up with some rather odd looking numbers. Right now, 1 degree is equal
to 60 nautical miles at the equator. It's too hot right now to think
about what decimal time would do to all those. Of course, we could
make things look better by switching from 360 degrees per circle, to
400 gradians per circle:
<https://en.wikipedia.org/wiki/Gradian>
When in doubt, change everything.
 
Everything that deals with time will need to be tweaked. That's going
to be a problem since we have many ways to keep accurate time:
<http://leapsecond.com/java/gpsclock.htm>
Notice the difference in seconds. Some smartphone vendors are still
having problems keeping accurate time:
<http://802.11junk.com/jeffl/crud/GPS-vs-UTC.jpg>
More ways to keep time, all of which will need to be decimalized or
maybe decimated:
<http://tycho.usno.navy.mil/systime.html>
 
This is what happened when most everyone assumed that NASA was totally
metric, but wasn't:
<http://www.cnn.com/TECH/space/9909/30/mars.metric.02/>
I suspect that a decimal time change will have similar transition
problems.
 
Why don't you just declare that the ratio of the circumference to the
diameter of a circle is exactly 3.0 instead of 3.14159...? I think it
would be easier than changing to decimal time.
 
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Robert Roland <fake@ddress.no>: Sep 02 10:38PM +0200


>he didn't believe you could buy anything in the US that *was*
>metric!!!
 
The whole world measures car wheel diameter in inches. There is,
however, one country where you can (or at leasy could) buy car wheels
in millimeter sizes. Wanna guess which country?
--
RoRo
Robert Roland <fake@ddress.no>: Sep 02 10:44PM +0200


>You still haven't explained how any of this will be better than what we have
>now.
 
We are dividing and multiplying by 10, which is much easier to
understand and to do calculation with.
--
RoRo
Jeff Liebermann <jeffl@cruzio.com>: Sep 02 02:07PM -0700

On Fri, 1 Sep 2017 05:55:52 -0700 (PDT), Tim R <timothy42b@aol.com>
wrote:
 
>had 5 days "out of time" at the beginning of the year, then 12 months
>of 30 days each.
 
>That still makes more sense than what we do now.
 
Then there is the Hebrew lunar calendar:
<https://en.wikipedia.org/wiki/Hebrew_calendar>
which adds an extra leap month in 7 out of every 19 years (3, 6, 8,
11, 14, 17, and 19):
<https://en.wikipedia.org/wiki/Hebrew_calendar#Leap_months>
Being able to handle such an ugly calenadar might explain why Jews are
quite good at finance. Can you imagine what a loan amortization
schedule looks like under such a calendar?
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
rickman <gnuarm@gmail.com>: Sep 02 06:10PM -0400

Jeff Liebermann wrote on 9/2/2017 3:03 PM:
 
> Why don't you just declare that the ratio of the circumference to the
> diameter of a circle is exactly 3.0 instead of 3.14159...? I think it
> would be easier than changing to decimal time.
 
I'm for it. How will you get the circle to agree?
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
rickman <gnuarm@gmail.com>: Sep 02 06:13PM -0400

Robert Roland wrote on 9/2/2017 4:44 PM:
>> now.
 
> We are dividing and multiplying by 10, which is much easier to
> understand and to do calculation with.
 
You need to do a bit more than say, "it will all work out". Sounds like a
steaming pile of crap to me. The calendar will be crap no matter what you
do because there is no connection between the day and the year. We are
using a crap system because there is no such thing as a good one. Units
less than a day are invented and can be changed at will. But we don't have
the will.
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
Jeff Liebermann <jeffl@cruzio.com>: Sep 02 04:35PM -0700

>> diameter of a circle is exactly 3.0 instead of 3.14159...? I think it
>> would be easier than changing to decimal time.
 
>I'm for it.
 
Excellent.
 
>How will you get the circle to agree?
 
Not a problem. Just put a flat spot (chord) somewhere on the
circumference. That will shorten the circumference sufficiently so
that the ratio equals exactly 3.0. Please feel free to name such a
flattened circle in my honor. The newly established Bureau of
Decimation should then declare that the official US circle will have a
flat spot.
 
 
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Clifford Heath <no.spam@please.net>: Sep 03 09:37AM +1000

On 01/09/17 12:36, rickman wrote:
>> people just would not go for it and it was abandoned.
 
> I don't remember that "people just would not go for it". I don't recall
> much resistance at all. I think the "resistance" was at other levels.
 
We had little resistance here in Australia too, and plenty of people
who would "not have gone with it". But it was mandated; all aspects of
industry and commerce were evaluated and placed on a time-line. By
a certain date, all green-grocers were required to display prices in
both pounds and kilograms. Some time later, prices had to be charged
by the kilogram. Some time after that, it became illegal to display
prices in pounds. Etc... and so for every part of life, on a schedule
that was planned ahead to assist people in learning the new system.
It was not just recommended as "a good idea".
 
My understanding is that "the land of the free"(*) failed because they
did not make it mandatory.
 
Clifford Heath
Mike Coon <gravity@mjcoon.plus.com>: Sep 03 12:51AM +0100

In article <ku5mqctnoo5ofl9qt10ofo2dr6nd87lgl8@4ax.com>, fake@ddress.no
says...
 
> We are dividing and multiplying by 10, which is much easier to
> understand and to do calculation with.
 
Years ago I went down to the office post room to buy a few stamps. They
were, IIRC, 19 pence at the time. Thinking the young girl at the counter
would tear off a 3x3 block for me I asked for 9 stamps. Her face fell
with panic at the prospect of asking me for the money! So I took pity on
her and changed my request for ten stamps. That didn't help her...
 
Mike.
rickman <gnuarm@gmail.com>: Sep 02 08:54PM -0400

Jeff Liebermann wrote on 9/2/2017 7:35 PM:
> flattened circle in my honor. The newly established Bureau of
> Decimation should then declare that the official US circle will have a
> flat spot.
 
I think that circle is already in use. I've seen shafts that shape and once
in awhile I see tires that shape. Heck, I saw one the other day that was on
a wheelbarrow. The story was that it was filled with polyurethane foam
instead of air and sat too long while curing. lol
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
rickman <gnuarm@gmail.com>: Sep 02 08:56PM -0400

Clifford Heath wrote on 9/2/2017 7:37 PM:
> It was not just recommended as "a good idea".
 
> My understanding is that "the land of the free"(*) failed because they
> did not make it mandatory.
 
Yes, everything here is "free, for a small fee".
 
--
 
Rick C
 
Viewed the eclipse at Wintercrest Farms,
on the centerline of totality since 1998
Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat>: Sep 02 05:32PM -0400

On 31 Aug 2017 11:13:25 GMT, the renowned Jasen Betts
>> That's possible, but somewhat dangerous due to the small size of the
>> filters.
 
>use a drop saw instead.
 
You can cut 3mm acrylic with a fine (eg. 80 tooth on a 10") carbide
blade on a table saw. No problem- just don't push it through too fat.
 
Or use a CO2 laser in the 40W range with air assist.
 
Or use a small CNC engraver with 4-flute mill.
 
--sp
 
--
Best regards,
Spehro Pefhany
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