[GreenKeys] The Metric System (was Independence Day

[Dave Wade]

David,

 

Well a US “pint” of water is around a pound of water, but the others have no correlation…

.. of course a UK Pint @ 20 fl oz isn’t, but it seems a more convenient measure than a US pint, which is perhaps you use the “quart” more often than in the UK where its really arcane.

 

Dave

G4UGM

 

From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of david freeman
Sent: 05 July 2017 13:30
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] The Metric System (was Independence Day

 

At my workplace we build custom automation equipment.

It is impossible to find all the components we need with Imperial threads.

Our machines are at best a mix heavier in one standard or the other.

Believe it or not, we can get closer to an all metric machine than we can imperial.

 

One fascinating thing about the metric system is 1kg weight of water is 1 liter in volume that is also 1000cc in size.

Quarts and pounds and inches have no correlation.

 

My major complaint about the metric system is thread pitch variety, we use 3 thread sizes for M12.

We don't even have imperial fine threads in our design library.

For our equipment, imperial fine threads are a nuisance.

 

Teletypes on the other hand, seem to love fine threaded fasteners, even extra-fine thread.

(Had to get some reference to greenkeys in here)

 

 

 

  

Sent: Tuesday, July 04, 2017 at 12:50 PM
From: "info at drukknop.nl <mailto:info at drukknop.nl> " <info at drukknop.nl <mailto:info at drukknop.nl> >
To: greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net> 
Subject: Re: [GreenKeys] The Metric System (was Independence Day

No problems here with metric here. its the strange inch type
(erratically called imperial) that i find confusing. no idea how to read
my calipers in inch scale. threads are too coarse, head too big and then
15/32? c'mon, you can't be serious.

And imagine that you didn't used decimal system in currency. the British
were one of the last to change to decimal counting in that.

;)

(not to mention factories inventing their own threads and sizes for
protection reasons...

simon)

On 04-07-17 07:12, WA5CAB--- via GreenKeys wrote:
> It was probably invented by French and/or Germans but as far as
> perfecting it, unh unh! Just take the ISO Metric threaded fastener
> system. Worst real-world threaded fastener system ever devised. Thread
> pitch is too fine. Hex nuts and hex cap screw heads are too small. Screw
> heads are too small. Screw slots are too narrow. The system is only
> usable in (a) a Clean Room or (b) a "total consumer" economy where when
> something stops working instead of fixing it, it goes to a land fill and
> a new one (that usually doesn't work as well as the old one) has to be
> bought.
>
> Inconveniently sized basic units is another built-in bad feature. In
> many cases, you have to use a million of them or a millionth of one of
> them to get to the "real world".
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
>
> In a message dated 07/03/2017 23:32:31 PM Central Daylight Time,
> hwhall at compuserve.com <mailto:hwhall at compuserve.com>  writes:
>> You know that those weird measures came to us via England, before she
>> swooned over a measurement system invented &perfected by French
>> &Germans, right? :-D
>>
>>
>> Wayne
>> WB4OGM
>>
>>
>
>
>
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
>
> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

--
Met vriendelijke Groet,

Simon Claessen
drukknop.nl
______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20170705/9468e695/attachment.html>