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Re: copper magnet wire
yes, it looks like you are right, but I did read somewhere that it is in
fact the number of wires that fit through a ??? that determines the gauge.
According to a 1954 reprint of Audel's mathematics and calculations for
mechanics (that happens to be sitting here), page 114, in a footnote: "
note - the sizes of wire are ordinarily expressed by an arbitrary series of
numbers. unfortunately there are several independent numbering methods, so
that it is always necessary to specify the method or wire gauge used."
The table provided above the footnote lists "americal or brown and sharpe",
Birmingham or stubs, washburn & moen mfg co, worchester mass, Trenton iron
co, trenton NJ, gwprentiss, holyoke mass, old english from Brass mfrs list,
and british standard. I wonder which one we use today?
your table matches "american". For 0000 gague, the diameters for the above
standares are respectively: 0.46000, o.454, 0.393, .400, N/A, N/A, .400.
There is also a table for American gauge, showing that 0000 gauge is equal
to two 0, four 3 gauge, eight 6, 16 -9, 32 -12, 64 -15, 128 -18 and so on -
as
you can see, for every doubling of the number of wires the equivalent gauge
increases by 3 (like decibels)
I swear I read somewhere, sometime that there was a relationship of the type
I described, but for now, I can't find it. maybe someone else on the list
has the definitive answer? I even tried my bosh automotive handbook, and it
doesn't even use wire gauge, it refers to the diameter in mm (so no help
there for the origin of the measurement). But I did learn that the word
gauge comes (according to the OED) from old french with a meaing of
performing a measurment.
And, I did manage to confirm that sieve sizes are the number of mesh per
inch (see page 2166 of the 23rd edition of the handbook of physics and
chemistry (1939). (not that it's totally relevnt, but it is obscure and
interesting)
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, August 23, 1999 4:34 PM
Subject: Re: copper magnet wire
> Original Poster: "Choad" <choad69-at-geocities-dot-com>
>
> Bill,
> I don't think it's # of bare turns per inch. #1 is 0.2893" in diameter
> just a little shy of the 1" mark. I'm going to post a wire chart I have
> below for anyone that wants it. Best if you look at it with a fixed font
> then past it to notepad or something.
> > Original Poster: "Bill Noble" <william_b_noble-at-email.msn-dot-com>
> <snip>
> > Wire size is called the wire "gage" - smaller numbers mean bigger wire.
> If
> > I remember right, the wire's gage is the number of wires (without
> > insulation) that will fit in a square inch - so "1" wire has a 1 inch
> > diameter, 2 has a 1/sqrt(2) or about 3/4 inch diameter and so on. There
> are
> > tables of these wire sizes in many reference books.
>
> Wire Table for AWG 0000 to 40, with diam in mils, circular mils,
> square microinches, ohms per foot, ft per lb, etc. mils = 0.001"
>
> Wire Table ANNEALED COPPER (AWG)
> AWG DIA in CIRC SQUARE OHM per LBS per FT per FT per OHM per
> gauge mils MILS MICROIN 1000 ft 1000 ft LB OHM LB
>
======================================================================
> 0000 460.0 211600 166200 0.04901 640.5 1.561 20400
0.00007652
> 000 409.6 167800 131800 0.06180 507.9 1.968 16180
0.0001217
> 00 364.8 133100 104500 0.07793 402.8 2.482 12830
0.0001935
> 0 324.9 105500 82890 0.09827 319.5 3.130 10180
0.0003076
> 1 289.3 83690 65730 0.1239 253.3 3.947 8070
0.0004891
> 2 257.6 66370 52130 0.1563 200.9 4.977 6400
0.0007778
> 3 229.4 52640 41340 0.1970 159.3 6.276 5075 0.001237
> 4 204.3 41740 32780 0.2485 126.4 7.914 4025 0.001966
> 5 181.9 33100 26000 0.3133 100.2 9.980 3192 0.003127
> 6 162.0 26250 20620 0.3951 79.46 12.58 2531 0.004972
> 7 144.3 20820 16350 0.4982 63.02 15.87 2007 0.007905
> 8 128.5 16510 12970 0.6282 49.98 20.01 1592 0.01257
> 9 114.4 13090 10280 0.7921 39.63 25.23 1262 0.01999
> 10 101.9 10380 8155 0.9989 31.43 31.82 1001 0.03178
> 11 90.74 8234 6467 1.260 24.92 40.12 794 0.05053
> 12 80.81 6530 5129 1.588 19.77 50.59 629.6 0.08035
> 13 71.96 5178 4067 2.003 15.68 63.80 499.3 0.1278
> 14 64.08 4107 3225 2.525 12.43 80.44 396.0 0.2032
> 15 57.07 3257 2558 3.184 9.858 101.4 314.0 0.3230
> 16 50.82 2583 2028 4.016 7.818 127.9 249.0 0.5136
> 17 45.26 2048 1609 5.064 6.200 161.3 197.5 0.8167
> 18 40.30 1624 1276 6.385 4.917 203.4 156.6 1.299
> 19 35.89 1288 1012 8.051 3.899 256.5 124.2 2.065
> 20 31.96 1022 802.3 10.15 3.092 323.4 98.50 3.283
> 21 28.46 810.1 636.3 12.80 2.452 407.8 78.11 5.221
> 22 25.35 642.4 504.6 16.14 1.945 514.2 61.95 8.301
> 23 22.57 509.5 400.2 20.36 1.542 648.4 49.13 13.20
> 24 20.10 404.0 317.3 25.67 1.223 817.7 38.96 20.99
> 25 17.90 320.4 251.7 32.37 0.9699 1031.0 30.90 33.37
> 26 15.94 254.1 199.6 40.81 0.7692 1300 24.50 53.06
> 27 14.20 201.5 158.3 51.47 0.6100 1639 19.43 84.37
> 28 12.64 159.8 125.5 64.90 0.4837 2067 15.41 134.2
> 29 11.26 126.7 99.53 81.83 0.3836 2607 12.22 213.3
> 30 10.03 100.5 78.94 103.2 0.3042 3287 9.691 339.2
> 31 8.928 79.70 62.60 130.1 0.2413 4145 7.685 539.3
> 32 7.950 63.21 49.64 164.1 0.1913 5227 6.095 857.6
> 33 7.080 50.13 39.37 206.9 0.1517 6591 4.833 1364
> 34 6.305 39.75 31.22 260.9 0.1203 8310 3.833 2168
> 35 5.615 31.52 24.76 329.0 0.09542 10480 3.040 3448
> 36 5.000 25.00 19.64 414.8 0.07568 13210 2.411 5482
> 37 4.453 19.83 15.57 523.1 0.06001 16660 1.912 8717
> 38 3.965 15.72 12.35 659.6 0.04759 21010 1.516 13860
> 39 3.531 12.47 9.793 831.8 0.03774 26500 1.202 22040
> 40 3.145 9.888 7.766 1049.0 0.02993 33410 0.9534 35040
>
> Ohms per 1000ft, ft per Ohm, Ohms per Lb all taken at 20 deg. C (68 deg.
> F.)
>
>
>