Re: [TCML] I think I ruined my 6" secondary.

[bunnykiller <bunnikillr@xxxxxxx>]

Hey Adam...

a bit more detail on my coil...

the secondary form is a 12.25 OD X .300" wall thickness shipping tube 
approx 60" O.A.L.
I sanded the outer and inner surface areas and "primed" with Behr 50.
I used my lathe to apply an 18ga. double Formvar magnet wire. I also 
added 10" of #10 THHN solid copper at the bottom of the coil for current 
reasons.
Next I applied 2 coats of Behr 50 in 48 hrs with the secondary still on 
the lathe at 5 rpm ( let the 1st coat dry for 24 hrs) applied 2nd coat 
next day and let dry for 24 more hrs.

removed secondary from lathe and recoated inner form with Behr 50, put 
back on lathe for 24 hrs.

From what I remember, the "elasticity" of the coating remained for 
about 3-4 yrs. Eventually it became "stiffer" over the next couple of 
years, but still quite durable against scratching. In the last 2 yrs or 
so it has evolved into a semiflexible coating ( not brittle) but the 
wire under the coating seems to have an easier time releasing itself 
from the Behr 50 when subjected to impacts ( generally falling over and 
hitting something). The spots of wire release seem to average about 2" 
in dia. at impact point.

I have run the coil at full power from my 30KV polepiggie at 65A ( 
280VAC into pig @ 65A) and have no problem with arcing in the seperated 
areas ( must be the double formvar coating :)  )

As far as storage...  it resides in my workshop... no A/C  just the 
temps that nature provides  ( 20 - 105 F and 1 nasty hurricaine) since 
2000 AD  :)

Scot D


>  

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