Re: [TCML] High voltage glue and ferrite cores

[jhowson4@xxxxxxxxxxx]

How big is what you want to vacuum pot? 


What i have done in the past uses canning jars and the like. 
I take what i want to pot (small trigger transformer in my case) and put it in the jar with some of the dielectric of choice (paraffin wax in my case) . I modified the lid of the jar by adding a hole then one of those small threaded hunks of copper pipe (just go look in the pluming section of Lowes etc, and you will see). threaded it in, sealed with gobs of epoxy. then used a little grease to seal the lid to the top of the Jar. Now its not wise to just pull a vacuum on this because you will get junk in your pump if you screw up. I then have a second jar with 2 pipes on top the inlet goes down to the bottom of the jar, while the outlet remains at the top, i added some fiber glass insulation as well to act as an air filter. Connect the output to your pump. and go to work. I found that the metal reinforced HVAC rubber hose stuff works just fine as a vacuum hose here. Just make sure all your connections are nice and tight. add grease/ sealant etc. 




In my case I put jar one in a pot of boiling water, jar 2 in some dry ice (to condense out water and crud, just ice would probably be fine, but i did not want to screw up my pump as it was my only one at the time). Wait for the wax to melt then pull a vacuum. i kept it under vacuum as the wax cooled. 


Once done I just open the jar, cut threw the extra wax and pulled my coil out. But you also could just break the jar. 


hope this helps you 



Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off you hands." 

----- Original Message -----
From: "Scott Bogard" <sdbogard@xxxxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Tuesday, November 29, 2011 3:38:05 PM 
Subject: Re: [TCML] High voltage glue and ferrite cores 

Hi Steve, 
Is there any way one can vacuum pot at home? As much as I want to 
reduce complexity, longevity is a concern for me, I do have some vacuum 
equipment for my plasma stuff, but in my head designing a rig to suck in 
liquid epoxy or resin or wax or whatever without losing vacuum seems like 
it would be a real bear... 

Scott Bogard. 

On Tue, Nov 29, 2011 at 1:10 PM, Steve Ward <steve.ward@xxxxxxxxx> wrote: 

> Sounds like super glue (the acrylic based stuff) would do the trick for 
> you. Ive used it many times for HV applications. To be honest, though, 
> any flyback that isnt properly vacuum potted with the right insulation is 
> likely to suffer from corona internally. It may take years (or maybe just 
> seconds) of occasional hobby use before this corona does its lasting damage 
> of shorting out your coil. Making HV transformers corona-free is hard. 
> 
> TSC is a good ferrite supplier, i use them myself. 
> 
> Steve 
> 
> 
> 
> On Tue, Nov 29, 2011 at 9:40 AM, Scott Bogard <sdbogard@xxxxxxxxx> wrote: 
> 
> > Hi All, 
> > Looking for suggestions for a glue that will be high voltage hearty, 
> > trying to steer away from epoxies, or anything else that must be mixed, 
> or 
> > melted (tar, wax etc.) This will be for securing the paper layers of my 
> > flyback transformer together, I was leaning towards eithor rubber cement 
> or 
> > even plain elmers glue, but do not know if they will hold up ot HV or 
> even 
> > small amounts of corona, so looking for suggestions. It must be cheap, 
> and 
> > easy, and a relatively fast dry time would be nice, I'd rather not take 
> 40 
> > days to put together a flyback secondary... Also I found a potential 
> > source for ferrite cores, has anybody had dealings with this company? 
> > http://tscinternational.net/tscstoreUcore.html 
> > I'm going to try and order tomorrow night and will share my experience if 
> > anybody is interested, their data sheet says their large U cores are good 
> > to almost 300 watts... 
> > 
> > Scott Bogard 
> > _______________________________________________ 
> > Tesla mailing list 
> > Tesla@xxxxxxxxxx 
> > http://www.pupman.com/mailman/listinfo/tesla 
> > 
> _______________________________________________ 
> Tesla mailing list 
> Tesla@xxxxxxxxxx 
> http://www.pupman.com/mailman/listinfo/tesla 
> 
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