Re: Brass bolt for top cap on secondary to secure toroid (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Thu, 26 Oct 2006 22:39:41 -0600
From: Gerry  Reynolds <gerryreynolds@xxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Brass bolt for top cap on secondary to secure toroid (fwd)

Hi John,

Certainly, as Bart suggests, it is best to keep any winding out of the 
secondary's inner core.  However, it is possible to do this sucessfully with 
no fear of internal arcs.  One needs to route the wire and have the bolt in 
regions of the internal guts where the field stress will accomodate.  I have 
done this sucessfully by routing a wire into the inner portions of the coil 
and keep the wire route above the top most turn of the secondary.  In 
addition, I have an acrylic baffle glued to the acrylic form about 6 inches 
below the top of the form (about 4 inches below the top of the windings). 
The wire terminates on a brass bolt attached to an end cap made of acylic. 
The coil is 8x36 and powered with 2KW that has obtained 86 inch arcs to 
ground.

Gerry R.

> From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Brass bolt for top cap on secondary to secure toroid (fwd)
>
> Hi John,
>
> Better "security" to use nylon. However, with that said, I've done it
> just as you have shown and never had an internal arc, but I don't do
> that any longer just for the "security" factor (I know it's just a
> matter of time). There is a greater risk of an internal arc using a
> metallic screw instead of a nylon screw (or other mounting method). If
> you use a brass screw, using a toroid with a center disc would be
> helpful to reduce high stress on the inside of the top cap. If your
> topload is something other than a toroid or if it is to be somewhat high
> above the end cap, then you have a greater risk of arcing from the
> screw. If possible, use nylon. In most cases, a large nylon screw is
> plenty of mechanical strength since it's simply sitting there. When
> moving the coil from here to there, always remove the toroid and remount
> it once the coil is in it's new position.
>
> Take care,
> Bart
>
> Tesla list wrote:
>
>>Original poster: List moderator <mod1@xxxxxxxxxx>
>>
>>
>>
>>---------- Forwarded message ----------
>>Date: Wed, 25 Oct 2006 22:40:06 -0400
>>From: John <guipenguin@xxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: Brass bolt for top cap on secondary to secure toroid
>>
>>Hello, I know most people use nylon bolts because of their
>>non-conductivity.... but would there be any problems with doing
>>something like this?
>>
>>Top of cap: http://i27.photobucket.com/albums/c178/GUIPEnguin/capup.jpg
>>Bottom of cap: 
>>http://i27.photobucket.com/albums/c178/GUIPEnguin/capdown.jpg
>>
>>When I apply a thick glob of silicone to the inner bolt, and then
>>silicone in a tight-fitted lexan disk? Along with a baffle at the
>>other end of the pipe...... this should be reasonable protection from
>>an internal spark using this small brass bolt right? Want to make sure
>>before I silicon everything tightly in place.
>>
>>Thanks,
>>     John.
>>
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