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Re: Temperature to melt NST tar and sonotube forms
---------- Forwarded message ----------
Date: Wed, 14 Jan 1998 12:17:13 -0700 (MST)
From: Chip Atkinson <chip-at-pupman-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Temperature to melt NST tar
There is one problem with chipping the tar out when it's cool/cold. The
tar shatters like glass leaving shards everywhere. While this is not a
problem in the cold, when it warms up, there are little balls of tar
everywhere. Be sure to do this chipping outside and in a location where
you won't track it inside.
RE Sonotube forms and puncturing -- While I did not have an arc strike the
side of the tube, I did experience dielectric breakdown between the coils,
and had arcs inside the tube between windings. Yes, something was
probably wrong, but this was my first coil and I was bummed that it blew
that easily. I also had not urethaned the form beforehand though.
Chip
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Chip Atkinson
http://www.pupman-dot-com
--- If I can't fix it, I can fix it so it can't be fixed --
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On Wed, 14 Jan 1998, Tesla List wrote:
>
>
> ---------- Forwarded message ----------
> Date: Tue, 13 Jan 1998 20:58:12 -0700 (MST)
> From: "Matt P." <ch038map-at-mode.lanl.k12.nm.us>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Temperature to melt NST tar (fwd)
>
>
>
> On Tue, 13 Jan 1998, Tesla List wrote:
>
> >
> >
> > ---------- Forwarded message ----------
> > Date: Tue, 13 Jan 98 19:09:31 EST
> > From: Gary Lau 13-Jan-1998 1851 <lau-at-hdecad.ENET.dec-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Temperature to melt NST tar
> >
> > >From: Christopher Stone <stone-at-etak-dot-com>
> > >Two quick questions, hopefully with easy answers:
> > >What temperature does the tar in Neon transformers melt at? How
> > >long should a transformer be cooked to repair the carbon tracks?
> >
> > I can't give you a numerical answer but can share a bit relating to the
> > experience. I cooked mine in an aluminum turkey roasting pan in a
> > covered Weber charcoal BBQ grill. It took about 2-3 hours to melt to a
> > thick, mostly-liquid viscous state and could not possibly have been done
> > indoors in a controlled oven, due to the smell, if that's what you're
> > thinking. I should add that the case leaked melted tar and was a pretty
> > horrible mess. Since my goal was de-potting and re-potting in melted
> > vasoline, I can't comment on time to repair carbon tracks.
> >
> > Gary Lau
> > Waltham, MA USA
> >
>
> All-
> While we're on the subject of unpotting neons, I have a question.
> I have read a bit about the freezing the neon, and the chipping away the
> tar as opposed to heating it. (the "cold cook" method or something like
> that...) Wouldn't this eliminate a lot of the mess you get with cooking
> the neons? I got the impression that it was a lot easier too, and you
> wouldn't have to worry about messing up your oven...
>
> Still working on first coil in NM,
> Matt
>