RE: formvar varnish

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

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hi Rick, Steve

The laminations have some sort of coating to insulate the laminations from
each other. This reduces the circulation of eddy currents throughout the
core. Afraid that I might remove this insulating coating, I never clean the
laminations with anything except water. I use a heat gun to quickly drive
off the water. 

Godfrey Loudner  

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Wednesday, December 12, 2001 8:59 AM
> To:	tesla-at-pupman-dot-com
> Subject:	Re: formvar varnish
> 
> 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
> > >
> > >
> > >
> > >
> >
> >
> >
> 
>