Re: Mutant Tar!!

To: tesla-at-pupman-dot-com
Subject: Re: Mutant Tar!!
From: "Daniele Bortoluzzi" <dbortoluzzi-at-sogeda.it> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Wed, 26 Apr 2000 16:23:26 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Brad,
I did this tar removing exactly with a hammer/screwdriver and
Tricloroetilene ... it takes a little but it works...
also you will mess with tar a little so don't forget to use gloves ;)

enjoy :)

ciao
Daniele


-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: mercoledė 26 aprile 2000 10.46
Subject: Re: Mutant Tar!!


>Original Poster: FutureT-at-aol-dot-com
>
>In a message dated 4/25/00 12:32:53 AM Pacific Daylight Time,
>tesla-at-pupman-dot-com writes:
>
>> Original Poster: "Brad DiGiovine" <Guido28-at-mediaone-dot-net>
>>
>>  to all,
>>
>>  i have had a NST sitting in gasoline for the past month unpotting and it
>>  is still not all off.  I can barely see the windings.  Has anyone else
>>  ever run into this?  my 12kv30ma NST only took a week, and this 15kv30ma
>>  is taking a lot longer.  Are there better solvents for unpotting than
>>  gasoline? thanks
>>
>>  Brad DiGiovine
>>
>
>Brad,
>
>Generally folks remove the bulk of the tar first by using hand tools.
>One way to do this is to put the NST in the freezer overnight to make
>the tar brittle, then chip it off with a hammer and screwdriver.  Another
>way is to heat the NST in an oven to soften the tar so it can be
>sloughed off easily.  Another way is to hold a heat gun to the NST
>to soften the tar as you go along scraping the tar off.  After most of
>the tar is removed, then it is soaked in the gasolene or kerosene.
>Don't combine heat and gasolene or kerosene techniques for obvious
>safety reasons.  Be careful not to damage the coils when scraping off
>the tar.
>
>Another thing to keep in mind is that all tar is not the same.  Jefferson
>brand NST's use a silica filler in the tar which makes it much harder to
>deal with.
>
>Some folks find the process too frustrating and wind up tossing the
>NST off a high cliff.
>
>Cheers,
>John Freau
>