Phillip,
How do you get your epoxy so crystal clear? I use a two-part epoxy ( not
cheap stuff) and it allways ends up foggy looking because of microsopic
bubbles. I use a 24h cure and have it set up on a rotating assembly with
a
microwave turntable motor. Is it how you mix it that matters? Or how you
apply it? Your coils look amazing by the way!
Rob.
________________________
On 2010-04-08 09:33:32 -0600 Phillip Slawinski <pslawinski@xxxxxxxxx>
wrote:
>
> Hi All,
>
> I too use the two-part epoxy coating on all my coils. I built a coil
from
> the ground up to produce a long spark length compared to the secondary
> length. It has taken a lot of work, but I think the results were worth
it.
> http://www.flickr.com/photos/pslawinski/4354745760/ During the process
of
> developing this coil I have had multiple flash overs.
> http://www.flickr.com/photos/pslawinski/4309814799/ I haven't lost a
> secondary to a flash over or spark related event. My secondary is
> wound
> with 34 AWG on a 12" x 3.5" form. Not coating a form with such fine
> wire
is
> simply not an option. The wire is very fragile, and will break with
> only
a
> mild amount of force, also with wire this fine expansion and
> contraction
of
> the form due to temperature change will cause the windings to loosen up
and
> fall down. Sadly, I know this from experience.
>
> -Phillip Slawinski
>
> On Thu, Apr 8, 2010 at 08:22, Peter Terren <pterren@xxxxxxxxxxxx>
> wrote:
>
>> Firstly, the experiment with the conventional coil is not conclusive,
>> sorry. Power was "about 20%" in the pre shot with racing sparks. No
>> mention
>> of actual values for the post shot and the sparks look very different
>> on
>> the
>> pics.
>> I am not saying the result is wrong, but it is highly likely the
original
>> power level was not reproduced.
>>
>> Secondly, DRSSTC's are different beasts in terms of coupling.
>> Obtaining
>> better Watt's ratios (spark length/sec length) seems a lot easier.
>> 13:4
=
>> 3.25 does not seem remarkably efficient in this regard.
>> On the other hand using an SGTC coil with no special insulation, I
>> have
>> Watt's ratios of 3.0 (96inches/32in). Others have claimed larger
>> ratios
>> for
>> SGTC's but I have not seen clear photos to show this. If you want to
>> follow
>> this link copy and paste it into your browser.
>> http://tesladownunder.com/tesla_coil_sparks.htm#6 inch coil (the best
>> ones)
>>
>> Nevertheless, the previous discussion of using ?Envirotex as a very
thick
>> layer does really seem to provide a lot of protection.
>> Some years ago I started a TC project to dramatically outperform this
3.0
>> Watts number. A lot of special fabrication was done and I still have
>> everything ready to start some final plans and construction. One day
when I
>> have a few moments........
>>
>> Peter
>>
>>
>>
>>
>> On 8/04/2010 1:16 PM, Dr.Hankenstein wrote:
>>
>>> Greetings,
>>>
>>> If you're not too sure on the effects of a good coating (or two or
>>> three) of varnish; please refer to a scientific evaluation on the
>>> following link:
>>>
>>> http://www.audiotesla.org/corona%20experiment.htm
>>>
>>> This should remove all doubt that varnish does more than just hold
>>> the
>>> winding in place and end the hypothetical armchair speculation. Dr.
>>> Spark has at least 80 coats of varnish on "Fatboy"---13+ footers out
>>> of
>>> a 4 foot secondary proves it:
http://www.drspark.org/fatboy1_rebuild.htm
>>>
>>> Regards,
>>> Hank
>>>
>>> _______________________________________________
>> 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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