RE: [TCML] OBIT Questions

["Dave Halliday" <dh@xxxxxxxxxxxxxx>]

After they have been frozen, short the secondary and run the transformer for
an hour or so. The heat will thaw a layer of tar so you will be less prone
to damaging the conductors.

DISCLAIMER:  I do not know if OBITs can withstand a dead short like NSTs --
the above advice is specific for NSTs.  That being said, if the OBITs have
the same sort of current limiting shunts, that would be the way to go...

Dave 

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx 
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Phillip Slawinski
> Sent: Tuesday, November 04, 2008 6:21 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] OBIT Questions
> 
> Petroleum-based solvents work best for this.  I used kerosene when I
> depotted NSTs.  I would suggest using the same method that Jay Haddock
> mentioned.  Put the transformers in the freezer and then use 
> a hammer and
> chisel to chip away the asphalt.  If the windings are brittle 
> enough to
> break while you're chiseling away the asphalt then you 
> probably don't want
> anything to do with the transformer anyways.  After you 
> chisel away the
> asphalt dunk the transformer in a tank of kerosene and start 
> scrubbing.  For
> best results let the transformer sit in the kerosene for a 
> few days.  It's
> not really important that you remove all the asphalt,   By 
> the way, it's
> best to do this outdoors, and away from anything you care 
> about.  You'll
> want to wear old clothes as well, as asphalt doesn't easily 
> come off shirts,
> pants, etc.
> 
> On Mon, Nov 3, 2008 at 22:52, <jhowson4@xxxxxxxxxxx> wrote:
> 
> > Haha another Jay. H.  Awsome. But now I have to type my 
> whole name.  =)
> >
> > I have tried to peel off the thin metal case before but 
> with no success.
> >  Just a big tar mess. I have 2 dead ones that have been 
> sitting on the table
> > for a while so maybe I will start trying non-destructivly 
> unpot those.
> > What type a solvent would be good for dissolving tar?
> > Thanks,
> > Jay Howson  =)
> >
> > -------------- Original message --------------
> > From: Jay Haddock <jhaddock@xxxxxxxxxxxx>
> >
> > > jhowson4@xxxxxxxxxxx wrote:
> > > > Hey Kevin
> > > > " If you "cook" one and remove the core
> > > > from the tar and run it in oil, it will run a long time."
> > > > could you describe your method for getting these things 
> out o the tar.
> > I
> > > tried once and i ended up destroying a good transformer.
> > > > thanks
> > > > Jay. H
> > > >
> > >
> > > The last one I did, I froze and took a hammer to it. That 
> worked quite
> > > well, didn't get every last bit out of the nooks and 
> crannies, but some
> > > solvent would clean it up easily.
> > >
> > > Jay Haddock (yes, another Jay H.)
> > >
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