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Re: [TCML] NST Insulator Carbon Track
Bart -
Why does the wax potting compound "need to cool quickly"?
My experience has been just the opposite, where a slow cooling rate allows
more uniform shrinkage distributed all across the mass of wax, while rapid
cooling tends to cause very deep "sinks"or even hidden voids at the center
of the mass of wax.
Regards,
Herr Zapp
----- Original Message -----
From: "bartb" <bartb@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Monday, April 13, 2009 6:06 PM
Subject: [TCML] NST Insulator Carbon Track
Hi All,
A couple weeks ago I mentioned depotting my NST, etc.. Well it worked for
a moment and died. One side of secondary was at 0V (again). Scratched my
head then once again melted out the wax and put the core on my work bench.
All was good on the work bench. Put it back in the case and all was bad..
I had new 15kV GTO wire, so I knew that should be good. It had to be the
insulator to case. I pulled out the insulator a few inches and tested.
Sure enough, the NST was good again.
Apparently, this insulator has a carbon track. I never expected that to
happen, yet it did. Just wanted to let you know this particular saga since
others may experience this at some point.
BTW, if using wax for a potting compound as I do, to prevent air bubbles
(and sometimes deep caverns), never pour a gallon of wax into the case.
You have to layer the wax. I use 1/2" increments letting the wax harden
before adding more wax. Also, never put the lid on the case when letting
the wax cool (it needs to cool quickly).
I'm unfortunately getting really good at potting and depotting this
particular NST.
Take care,
Bart
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