Re: PVC Pipe

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>

Even if you dry the secondary tube the usually coatings are permeable to
water vapor so over a period of time the tube material will reach
equilibrium with atmospheric water vapor.
The winding because of its copper content probably represents a more serious
barrier if its coated.
Thick air tight baffles on the top and bottom of the tube probably also
represent serous barriers.

I agree the primary reseaon for coating the windings are for mechanical
protection and to provide a smooth easily cleaned surface.
It may help a little with racing sparks and to an even lesser extent corona
formation.

It also makes the coil look nice.

Robert  Jones

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, March 11, 2005 11:45 PM
Subject: Re: PVC Pipe


> Original poster: Karl Lindheimer <karl@xxxxxxxxxxxxxxx>
>
> Gary,
>
> I would have to concur with your statement that sealing the secondary
> windings with poly or lacquer is a very good idea.  The finish provides:
> 1.  physical protection of the secondary windings.  2.
> Mechanical aid to prevent windings from slipping or uncoiling.  3.
> Insulation against racing sparks and arcing to primary.  4.  A nice finish
> to look at.
>
> Dan;
>
> I also nearly agree with your statement that drying and sealing the
> secondary former is usually not necessary.  Right now, in the Northeast,
> the humidity levels are under 20 %.  You won't get much better even in a
> drying oven.  The only time I would recommend oven drying and then sealing
> would be if the PVC tubing were exposed to very humid conditions outdoors
> for a while.  Even then, it probably would not matter with the average
coil.
>
> Regards,
>
> Karl
>
> On Mar 11, 2005, at 5:55 PM, Tesla list wrote:
>
> >Original poster: "Lau, Gary" <gary.lau@xxxxxx>
> >
> >I would have to agree.  But I do still like to apply several coats of
> >polyurethane over the wound secondary to keep things from moving about,
> >and general aesthetics.
> >
> >Regards, Gary Lau
> >MA, USA
> >
> > > Original poster: "Daniel McCauley"
> ><dhmccauley@xxxxxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > I don't think you have to worry about drying and sealing your PVC
> >pipe.  To
> > > be honest, i think its a waste of time.
> > > I've built plenty of coils in the past years without doing this and
> >i've
> > > never had a problem.
> > > I wouldn't waste your time on that.
> > >
> > > Dan
> > >
> > >
> > >  > All,
> > >  > Thanks a lot for all the info on PVC pipe. They weren't kidding
> >when they
> > >  > said everyone on here is nice and helpful! From what you've told me
> >and
> > >  > from what I've seen other people using on their very successful
> >TC's, I
> > >  > think I will just go ahead and dry and seal white schedule 40 PVC
> >inside
> > >  > and out and use it. It certainly is cheap and easy to find.
> > >  > Paul Brodie
> >
>
>
>