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NST core removal progress
Original poster: "M G" <gt4awd@xxxxxxxxx>
Hello everyone, for a while now I have been working on removing a NST
core from its case. This was a NST that I was able to get for just
the cost of shipping, and is a warrantied NST meaning it has some
core issues. Most likely cause of the slightly lower than average
output on a jacobs ladder is internal carbon tracking. I did get two
NST at the same time. They are both 15kv 30ma Fraceformers, but the
second one only makes a slight hum when powered. The first process I
used to start the removal of the tar was the heating method. One of
the insulators had broke off during shipping, and this gave a
convenient area for the tar to slowly seep out of.
The heating process took over five hours because I had started the
temperature at only 220F. After nearly two hours in the tar was
barely even soft! . I slowly upped the temperature until 310F. (Yes
thats right, I used my oven. Decided if it got too messy, started to
smell bad, or smoke, I would just cut the heat, and head out to the
grill. It worked fine, other than a slight tar smell, and a tiny mess
from scooping tar out with a spoon.) At this point the tar was
seeping out of the broken insulators hole at a decent rate. I tilted
the opposite side, not draining, up some to aid in getting the tar to
seep out of the insulators hole.
The problem is I had to cut short the heating process and attend to
other matters. So I was never able to remove the core from the case.
I had attempted it and it would not budge. Most likely not heated up
enough, or just too much tar left. After that I started soaking the
NST in Kerosene. After two weeks of the core still not wanting to
budge I decided to pull it out of the kerosene, and let it dry out.
The core is mostly dried now, and only about 20% of the tar remains.
Most of it l! ocated under the core, and on the core to case side
with least length.
Today, being that the tar was mostly dry, I decided to remove the
insulators, and low voltage connections. After this I used the Dremel
tool with grinding pad to cut down the edges of the frount side of
the NST case. By the way, if you look at a NST case you can see that
one edge seems as if it can be spliced in two with a chisel and
hammer. This might be true with a really good and sharp chisel, but
did not work out in my case. Why? There is about three very thick
welds attaching these two pieces, and because of this I had to grind
both sides off in order to bend the side down, and away from the core.
What would you suggest I do from here to safety remove the core?
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