Re: Water absorbtion of Gray PVC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Opinions, um, differ?

Jeff has contributed a "great deal" (this post would be the most recent 
example), as has Dan and David.

My  8.5" coil uses a white pvc form, sanded, but "not" coated. It works 
wonderful! Oh, yes, I "have" tracked behind the winding on the form just as 
Jeff and Dr. R. have mentioned. I've had to remove a couple inches to 
repair. It's ran fine since (same approx. power level - go figure).

Neither opinion can guarantee anything. But, since I really don't like 
removing winding to repair (not to mention what it took to find the problem 
in the first place), I'll coat next time just to reduce that probability. 
Just my opinion and related experience.

I think we can end the post and simply say to coilers:

"by coating the form, you reduce the possibility of surface tracking on or 
through the form. By not coating, the risk is increased. The risk itself is 
based on voltage, moisture content of the form, surface characteristics, 
contamination, and other environment considerations. With low power coils, 
the risk is low, but there is no guarantee. There is also no guarantee with 
higher powered coils using coated forms, but the risk is greatly reduced."

how's that? <grin>

Have fun,
Bart


Tesla list wrote:

>Original poster: "David Trimmell" <humanb-at-chaoticuniverse-dot-com>
>A bit harsh Jeff, don't you say? Dan has contributed quite a bit to the
>TCML, even if he has "only" ventured into this stuff in the last few
>years. I believe you are both correct in your statements regarding
>preparing coil forms. So why the harsh words?
>
>By the way, what have you contributed to this forum (aside from taking
>the "trade secret" line)?
>
>David Trimmell
>
>"Think what you may about Dan's writings; I personally don't think they
>make
>any sense at all...
>
>Jeff Parisse"
>
>-Director KVA Effects
>
>
>
>