RE: twin stacked primary supports

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

Hi Mike:

I had a piece of 1/4" Lexan sheet between my two flat coils, extending
horizontally 1" beyond the coil's OD, and I still got an arc-over,
surface tracking on the Lexan well over 2".  I got rid of a couple of
unused outer turns and increased the coil-to-sheet-edge clearance to
1.5", and that fixed it.  This is with a 15/60 NST.

I wasn't suggesting you use a single-layer flat primary, but rather a
2-layer flat primary, to allow you to use a flat insulator between them.
I made my 2-layer primary for the same reason - to get it through the
garage door.  See http://www.laushaus.com/tesla/primary.htm.

Regards, Gary Lau
MA, USA


> Original poster: "Mike Tucknott" <michael.tucknott@xxxxxxxxxx>
>
> Hi Gary
>
> Thanks for the comments, I spoken to other coil builders and I`v
increased
> the spacing between the layers by 2 1/2 times the conductor size, I
think
> this
> might just be a suck it and see, if I do get layer to layer arcing
then I`ll
> go back
> to the drawing board and insert insulation or increase the layer to
layer
> space.
>
> If I build a flat primary it needs to be 36 1/2 out side dia and this
is
> just to big
> it might sound crazy but 24" by 24" will fit through my garage door
and out
> in
> to the garden. ops.......
>
> Cheers Mike T
>
>
>  > Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
>  >
>  > Hi Mike:
>  >
>  > Your supports will make for a very neat looking primary assembly,
but
>  > with a 2-layer primary, an unbroken plastic insulating layer
between the
>  > coils is mandatory.  If you join the inner turns, you will get
surface
>  > tracking along your supports at the outer turns.  I can't think of
any
>  > practical way to insulate two conical coils.  Why can't you use
flat
>  > coils?
>  >
>  > Regards, Gary Lau
>  > MA, USA
>  >
>