Re: formvar varnish

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

Original poster: "Rick Williams by way of Terry Fritz <twftesla-at-qwest-dot-net>" <richardwwilliams-at-earthlink-dot-net>

Hey Steve,

I've disassembled quite a few transformers though not quite the size you're
speaking of.

I use a sharpened hacksaw blade with a handle on it. Get it started between
the layers then tap it all around the lamination. Try not to bend them while
separating them. The flatter they fit together upon reassembly the better.
The first lamination is usually the hardest to remove and may have to be
thrown away. Once started it's not difficult, just takes a lot of time.

After disassembly they will need cleaned to remove the varnish. I use a
parts cleaner at work with the solvent they use but I believe kerosene will
do the job.

Rick W.
Salt Lake City

----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, December 11, 2001 10:52 PM
Subject: Re: formvar varnish


> Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<slwhite-at-zeus.ia-dot-net>
>
> After reading this post about Formvar varnish I was wondering how hard it
is
> going to be to disassemble a transformer that I obtained for nothing. I
have
> a large (25 KVA) 120,240,480 distribution transformer which has about 250
> pounds of E and I sections, but they are are all interlaced. I want to use
> the E and I sections to construct an air core ballast. I need to
disassemble
> the E and I laminations so that I can restack them with an air gap. Will I
> be able to separate these laminations or are they glued together so tight
> that it will be difficult to delaminate them?
>
> Steve: Coiling in Iowa
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Tuesday, December 11, 2001 6:17 AM
> Subject: Re: formvar varnish
>
>
> > Original poster: "Rick Williams by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <richardwwilliams-at-earthlink-dot-net>
> >
> >
> > ----- Original Message -----
> > From: Tesla list <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Sunday, December 02, 2001 8:01 PM
> > Subject: formvar varnish
> >
> >
> > > Original poster: "Loudner, Godfrey by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>
> > >
> > > Hi All
> > >
> > > Does anyone know where one can get a gallon or two of formvar varnish?
> > >
> > > Godfrey Loudner
> > >
> > >
> > >
> >
> > Hey all,
> >
> > Formvar has the property of curing when heated without the need for
> exposure
> > to air. It's used to bond transformer laminations. The transformer is
> > submerged and a vacuum drawn afterwhich it is heated to cure the formvar
> > throughout.
> >
> > Seems Godfrey and I have a common interest in tranny construction.
> Therefore
> > our interest in Formvar. But we haven't been able to locate any. Could
> there
> > be a substitute? Maybe another method to bond the laminations, coils ...
?
> > Eliminating transformer buzz can be quite tough for me, especially with
> > heavy power trannys.
> >
> > Rick W.
> > Salt Lake City
> >
> >
> >
> >
>
>
>