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Re: [TCML] Burnt Joint (Cap Bank)



Mike,
avoid black materials.
In many cases the black pigment will be carbon and that's conductive.

You've got a 500VA NST, based on this, the max. achievable spark length is
97cm or 38".
If you'd eventually build a coil half that size maybe. So 10x50cm as you
propose will do fine.
When you want to increase secondary sizes, a wider diameter coil will
perform better than a taller coil

Regards,
Mark



2013/5/12 Mike Gray <graymp89@xxxxxxxxx>

> Okay thanks for that - I'm not too bothered about transparency in the
> plastic, and it appears that the transparency will cost you extra, so I'll
> go for some HDPE. Black probably, should look quite smart.
>
> Anyway before I order I need to know what minimum width I'm going to need
> on the sheet, and since I need to re-wind my secondary I will probably make
> it a bit wider and taller. My current secondary, at 5.6cm diameter and 27cm
> tall, only has approximately 600 turns... which should be more like 1000+
> yes?
>
> If I used a 4" diameter form for the secondary, and wound a 50cm tall coil
> on that, that would give me just over 1000 turns. Are those dimensions
> suitable for me? My NST is 10kV, 50mA.
>
>
> On 12 May 2013 19:26, Jim Lux <jimlux@xxxxxxxxxxxxx> wrote:
>
> >
> > On 5/12/13 11:15 AM, Mike Gray wrote:
> >
> >> Thanks again for all the advice, really appreciate it. I've had another
> >> crack this weekend and I'm happy to report partial success! I have a
> >> number
> >> of questions too...
> >>
> >> To respond to earlier messages, I firstly cut my strike rail down a bit
> so
> >> there's a decent (~2 inch) gap between the two ends, thanks for pointing
> >> that one out. With regard to the wood framework I've used for most of
> it,
> >> I'm going to order a load of Perspex sheeting to re-design the framework
> >> altogether. Does anyone have any recommendations for this? I'm in the UK
> >> and will probably just order some 15mm thick acrylic sheets from an
> online
> >> vendor, unless advised otherwise.
> >>
> >
> > Polycarbonate rather than acrylic would be my choice.  Don't know the
> > trade name in UK.  Lexan is one name in US.  It doesn't crack as easily
> > when drilling holes, etc.
> >
> > If you want an inexpensive, easy to work with material for HV, I
> recommend
> > plastic cutting boards. They're available in Polyethylene, Polypropylene,
> > and Polycarbonate, and all work great.  HDPE is easy to work with (cut
> with
> > wood working tools) and a great insulator: it just isn't clear: if you
> want
> > that, then polycarbonate is your friend.
> >
> > You can get fairly good sized sheets of HDPE as cutting boards at a
> > restaurant supply store, online, or in other places.  Around here
> (southern
> > california) a 18x24" cutting board 1/2" thick runs about $13-15.
> >
> > Polycarbonate can be glued. PE cannot (at least not easily).
> >
> >
> >
> >
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