https://www.vxb.com/SearchResults.asp?Search=Mirror+Finished+Stainless+Steel+Shiny+BallCheck
here, I have purchased various sizes from them and thought prices were
reasonable.Doug
-----------------------------------------From: "Steve White"
To: "Tesla Coil Mailing List"
Cc:
Sent: Thursday October 25 2018 6:50:14PM
Subject: Re: [TCML] Corona shielding - special shape
I have seen pictures and videos of some big commercial Marx
generators that use this multiple small sphere method.
Steve White
Cedar Rapids, Iowa
----- Original Message -----
From: "Tedd Dillard"
To: "Tesla Coil Mailing List"
Sent: Thursday, October 25, 2018 5:52:29 PM
Subject: Re: [TCML] Corona shielding - special shape
Why couldn't yoi use several of these in a cluster. It would look
like a
ball made of other balls. There would be no surface that was not at
the
radius of the bowls.
You could choose what ever size tha you wanted and could also use
smaller
ones to fill in any gaps.
Teddy
On Oct 25, 2018 5:30 PM, "Matthew Sweeney" wrote:
> Ikea/Amazon/etc. carry spun steel bowls in various diameters up to
14
> inches. They are almost perfect hemisphere and have no lip on the
edges.
>
> These are perfect for VDG terminal so should probably work well
enough.
> They are very cheap less than $20 for the 14 inch.
>
> Here is a link to get started:
>
>
> https://www.amazon.com/Ikea-Stainless-Steel-Serving-
/> > Blanda/dp/B00ORZ3SAS/ref=asc_df_B00ORZ3SAS/?tag=hyprod-20&
> linkCode=df0&hvadid=193156615606&hvpos=1o3&hvnetw=
> g&hvrand=2658627117845858571&hvpone=&hvptwo=&hvqmt=&hvdev=
>
m&hvdvcmdl=&hvlocint=&hvlocphy=1016367&hvtargid=pla-305275212649&psc=1
>
> On Thu, Oct 25, 2018, 12:26 PM Brian Hall wrote:
>
> > I have a high voltage application that requires the end of a
horizontal
> > metal cylindrical bar to be covered so that it won't emit corona.
The
> bar
> > could be up and down vertical, or horizontal and parallel to the
floor.
> >
> > Does anyone know of a supplier that already provides, or for a
reasonable
> > price could manufacture, a sphere or spheroid, or even a rounded
off
> > conical shape (no point on it of course, or it could be a tapered
tube).
> > On the opening(s) the metal would have to be turned on a lathe or
by
> some
> > means curl in the edges all around the circumference.
> >
> > Total diameter should be about 6" (150 mm) or larger, with an
opening
> > about the same diameter - I realized after my supervisor told me
that, it
> > would just be a hemisphere bowl that would fall off when the bar
is
> > horizontal. So, maybe 8" O.D. and a 6" opening. The proportions
should
> be
> > such that 2/3 of the corona shield is a smooth metal rounded
surface, and
> > about 1/3 is the opening.
> >
> > This is for hipot testing in a fairly new and quite large
professional
> lab
> > at up to 600 kV AC, 60 Hz. If anyone can point me to a good
supplier,
> it
> > would be much appreciated.
> >
> > I've been quiet on this list the past couple of years because
starting
> > Fall 2015 I went to university night school, taking four
semesters of
> > circuit theory one after another, aced the classes (A- in level
4, all of
> > them through a lot of hard work) and got hired last year as an HV
test
> > engineer. Those of you recalling my previous emails several years
past,
> > don't worry, I've been through weeks and months and volumes of
safety
> > training with lots and lots of supervised hands on practice and
guidance
> > from experienced professionals.
> >
> > ----------------------------------
> > Brian Hall
> >
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxxxxxx
> > https://www.pupman.com/mailman/listinfo/tesla
/> > >
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxxxxxx
> https://www.pupman.com/mailman/listinfo/tesla
/> >
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