Re: Hacking the AWG WIRE TABLE (fwd)

---------- Forwarded message ----------
Date: Tue, 5 May 1998 08:26:11 -0700
From: Jim Lux <jimlux-at-earthlink-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Hacking the AWG WIRE TABLE (fwd)

> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re:  Hacking the AWG WIRE TABLE (fwd)
> Date: Monday, May 04, 1998 8:50 PM
> ---------- Forwarded message ----------
> Date: Mon, 4 May 1998 19:29:29 -0700 (PDT)
> From: "Edward V. Phillips" <ed-at-alumni.caltech.edu>
> To: tesla-at-pupman-dot-com
> Cc: d-at-alumni.caltech.edu
> Subject: Re:  Hacking the AWG WIRE TABLE (fwd)
> Fr. McGahee:
> 	That stuff was intended as an interesting historical note,
> not a correction of what you had published.  As for the wire tables,
> I assume they are calculated based on this formula.  Certainly 
> no one can draw wire to a three figure accuracy, at least not
> for a reasonable price, so "slide rule accuracy" is surely good
> enough.  I suspect that the real tolerance on #50 wire (used in
> meter movements only, I would suspect, if anyone has actually
> drawn and insulated any) would be of the order of 20% or so.

MWS makes ultra fine magnet wire (used in magnetic recording heads and
meter movements, and those incredibly tiny surface mount inductors) as fine
as #60. The spec is by resistance, not by diameter, though. This might give
a clue as to how they "draw" the stuff, they might use varying tension to
change the amount of stretching, which would change the diameter, and hence
the resistance.

#60  is .000309 inches in diameter (with single build insulation it is
.000365 diameter) It has 108.41 ohms per foot resistance.

I note that another application of the really fine wire is in making Litz
wire. MWS uses all the gauges from 42 to 48 in their catalog Litz wire.
Imagine, 175 strands of #48 to produce an effective wire of #25.5. All of
.021 inches in diameter.