Re: Where am I going askew ?

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

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


I have 42 turns / inch for single formvar Beldon magnet wire.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, October 28, 2003 1:37 PM
Subject: Re: Where am I going askew ?


 > Original poster: Esondrmn-at-aol-dot-com
 >
 > In a message dated 10/24/03 7:44:06 PM Pacific Standard Time,
 > tesla-at-pupman-dot-com writes:
 >
 >
 > > >I read Bart's reply on your questions.  I also ran some calculations on
 > > >your coil but for some reason, came up with different numbers than Bart
did.
 > > >
 > > >(Bart, the primary difference seems to be in the resonant frequency of
the
 > > >secondary.  I used 49.75 turns / inch and at a 97% winding factor -
i.e.
 > > >we don't usually achieve a turns per inch as tight as in the wire
 > > >tables.  I get 1,086 turns total.
 > >
 > >Ed, using 24 gauge wire (which is what was used), Javatc calcs 44.4
 > >turn/inch. 24 gauge is 0.0201' bare and 0.0012" insulation (single
build).
 > >This is nominal magnet wire values from Phelps-Dodge tables. If anything,
 > >44.4 TPI is on the tight side. In the real world, a closewound coil will
 > >typically end up with less which can be put on the shoulders of
 > >human/machine error and tensioning affects. This of course will decrease
 > >the number of turns per unit area. Your 49.75" is extremely tight for 24
 > >gauge wire (unless the wire is far outside of nominal values). Possibly
you
 > >used some other gauge?
 >
 >
 > Bart,
 >
 > The wire table that I used was originally published by Fr. Tom McGahee a
 > couple of years ago.  It says # 24 wire is 20.101 dia. in mils or
 > .0201".  That must be for bare wire with no insulation or coating.  I will
 > check the Phelps-Dodge tables.
 >
 > Thanks, Ed Sonderman
 >
 >
 >