Re: [TCML] Lacquer

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I'd coat then draw the vacuum.

As to the stresses, remember from your engineering classes, hoop stress! A cylinder is ideal for this. All you need are hemispherical end caps, which aren't that hard to come up with. No internal bearings needed. I'd go on with descriptions, but no one's gonna do this anyway.

Just trying to say, it's not impossible.

Glad to debate this offlist, as this ain't never gonna be done.

Adam, P.E.

--- On Thu, 4/8/10, Bill Noble <william_b_noble@xxxxxxx> wrote:

> From: Bill Noble <william_b_noble@xxxxxxx>
> Subject: Re: [TCML] Lacquer
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Thursday, April 8, 2010, 10:18 PM

> yeah, but ---- that wouldn't work -
> the thing needs to be turning while you apply epoxy, then
> while it's still turning, seal and draw vac.  if you
> had high quality rotary vac seal you could get away with
> motor outside - sometimes a good sealed ball bearing will do
> (see the article on vacuum chucks on my web page for if you
> are desperate - wbnoble.com) but, if you can make a box that
> will handle the (very large) compressive forces, that would
> be easiest - remember you will have about 15 psi, and those
> square inches add up quickly.
> 
> --------------------------------------------------
> From: "Yurtle Turtle" <yurtle_t@xxxxxxxxx>
> Sent: Thursday, April 08, 2010 2:04 PM
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Subject: Re: [TCML] Lacquer
> 
> > You wouldn't need to have the motor inside the vacuum.
> A larger pipe with endcaps and a vacuum fitting could be
> fitted over the freshly coated secondary. Both the vacuum
> pipe and the secondary could share the same shaft, which
> could be connected to the motor. Pump it down then spin it
> up.
> > 
> > Still, a lot of work.
> > 




_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla