Re: UNITS

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net> 

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, February 01, 2004 6:48 PM
Subject: Re: UNITS


 > Original poster: Finn Hammer <f-h-at-c.dk>
 >
 > Ken,
 >
 > 0.80mm is the diametre of a wire the size of which lies inbetween a wire
 > that is 0.79mm in diametre and one that is 0.81mm in diametre.
 >
 > I`m sorry that there is no easy AWG equivalents here, but then, that`s the
 > beauty of the metric system.

Sorry, I don't need an AWG replacement, AWG works just fine. I"m always
amused how there are engineering failures when people try to convert inch
units into metric to "feel happy" as part of some international project. It
almost seems those who love metric cannot do simple math most of the time
outside of multiply and divide by 10. I find this funny, as unless 1 finger
= zero, a system based off fingers should be base 11.



 > Because we can walk right into a motor rewind shop and get wire with
0.01mm
 > difference.

I'm sure your motor stock stocks all wire in 0.1mm increments. That's funny.
Please send me a variety pack of 0.34 0.35 0.68 0.77 and 0.92 2.13 and
3.99mm bare wire, 1.3meters each. Thanks!

 > Here is an explanation why it is easier to understand magnetics, if you
 > take the SI approach:
 >
 > Systems of Units:
 >       The internationally accepted SI system of units (Systeme
 > International dÙnitès) is a rationalized system, in which permeability, µ
=
 > µo*µr (µo is the absolute permeability of free space or nonmagnetic
 > material = 4pi*10^-7; µr is the relative permeability of a magnetic
 > material). In the unrationalized CGS system, µo=1, therefore µo is omitted
 > from CGS equations so that µ = µr. But the rationalization constant µo
does
 > not just disappear in the CGS system - instead, portions of this constant
 > now show up in all the CGS equations, complicating them and making them
 > more difficult to intuitively grasp. In the SI system, all of the
"Garbage"
 > is gathered into µo, thereby simplifying the SI equations.
 >
 > This was taken from:
 > http://focus.ti-dot-com/lit/ml/slup123/slup123.pdf
 > and I owe it to Jan Wagner
 > http://www.hut.fi/~jwagner/tesla/
 > to have found the article in the first place.
 >
 > Cheers, Finn Hammer
 >
 >
 > Tesla list wrote:
 > >Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net>
 > >The AWG system makes sense, there is never confusion about "are you
talking
 > >diameter or cross sectional area" as with metric. We do have MCM for
large
 > >wires, but again, it's simple - MCM = 1000 circualr mils, that's it. What
is
 > >say 0,8mm wire supposed to be?
 >
 >
 >
 >
 >