RE: [TCML] Coil forms, any good?

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

Thick walled PVC is pressure pipe, which means it's
NSF approved for transporting drinking water. Thin
walled pvc is drain pipe, which "may" have less QA/QC
than pressure pipe.

Adam

--- "Lau, Gary" <Gary.Lau@xxxxxx> wrote:

> If the pipe were 100% PVC, there would be no
> problems.  But with either thin or thick wall PVC,
> one runs a small risk of there being a spec of
> conductive flotsam just beneath the outer surface
> that could cause a short between the potential of a
> few turns.  If you stick a light bulb inside a piece
> of thin wall pipe you may see this.
> 
> But I've used nothing but PVC pipe and never had a
> problem.  For the majority of us that pay for pipe,
> PVC is the only economical choice.  I don't know if
> thin or thick walls alter the risk of conductive
> flotsam.  I was able to do the light bulb thing on a
> piece of very thin-wall 4" SDR pipe, but I've not
> seen 6" pipe thin enough to be translucent.  Odds
> are it will be just fine.
> 
> Regards, Gary Lau
> MA, USA
> 
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of otmaskin5@xxxxxxx
> > Sent: Tuesday, January 15, 2008 6:07 PM
> > To: tesla@xxxxxxxxxx
> > Subject: Re: [TCML] Coil forms, any good?
> >
> > Hi Gary, just to confirm what I hear you
> saying...thick walled PVC secondary form
> > doesn't have any downside with respect to its
> electrical properties - it's just a matter
> > of adding unwanted weight to the system...Is that
> correct??
> >
> > Reason I'm asking, I've got some 6" heavy-walled
> PVC I can use.? But if it hurts
> > performance, I'll have to track down some
> thin-walled pipe.
> >
> > Thx, Dennis Hopkinton MA
> >
> >
> > -----Original Message-----
> > From: Lau, Gary <Gary.Lau@xxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Tue, 15 Jan 2008 2:46 pm
> > Subject: RE: [TCML] Coil forms, any good?
> >
> >
> >
> > The only credible reported difference in secondary
> form materials so far as
> > losses are concerned have been in the paper-based
> "Sonotube" concrete forms.  It
> > wasn't the paper, it was the unknown binder that
> was believed to be responsible
> > for the losses, and even then, the losses were
> theoretical based on (I think)
> > ringdown measurements.  It was felt that such
> losses might only be an issue on
> > CW or solid state coils.  The many, many
> pig-powered Sonotube coils that work
> > just fine are evidence that it's not a deal
> breaker.
> >
> > There was also a report that PVC pipe often
> contains random debris that in at
> > least one instance, proved to be conductive,
> causing a secondary short.  PVC
> > itself is just fine though.
> >
> > I think there would be no measurable performance
> difference between the
> > materials you mentioned.  I would base the choice
> on material strength,
> > machinability, color (aesthetics), will glue and
> polyurethane stick to it, and
> > weight.  I would choose the thinnest wall that's
> structurally adequate, but only
> > to minimize weight.
> >
> > Regards, Gary Lau
> > MA, USA
> >
> > > -----Original Message-----
> > > From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On
> > > Behalf Of Tesla
> > > Sent: Tuesday, January 15, 2008 1:59 PM
> > > To: tesla@xxxxxxxxxx
> > > Subject: [TCML] Coil forms, any good?
> > >
> > > Hi all.
> > >
> > > I have just struck a little bit of gold, I now
> have more or less
> > > unlimited supply of
> > > coil forms in glass fabric, cotton fabric and
> paper. The resin in
> > > these forms are some of the
> > > following: Phenolic, Epoxy, Melamine, Silicone
> and Polyester.
> > >
> > > Are they all good for winding coils on or are
> there some that i should avoid?
> > > Also if they're good, does the thickness of the
> wall(RF losses)
> > > affect the coil performance
> > > with these materials?
> > >
> > > Of course i have seen several on the web using
> fiberglass so i guess
> > > that should be ok
> > > but what about the other materials?
> > >
> > > Any input appreciated as i can get any diameter
> in any length for
> > > free. Lucky me....=)
> > >
> > > Thanks!
> > > /Matt
> > > www.tesla.nu (in Swedish)
> >
> > _______________________________________________
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> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> >
> >
>
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