Re: tesla-d Digest V02 #815

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Greg Leyh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <lod-at-pacbell-dot-net>

Hi Robert,

I'm not sure that I fully understand your point,
but rest assured that my next coil design will
not utilize a fiberglass lay-up, or PVC irrigation
pipe for that matter.

-GL


>Original poster: "robert heidlebaugh by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>
>
>Greg: I buy white PVC pipe from 1" thick down to 1/4" thick and from 5/8" to
>42" dia so playing with sono tube seams a waste of time, but if you must
>pull a tight layer of sheet polyethylene over it before you plastic coat so
>the fiberglass wont stick. Phone your local irrigation supplier first.
>    Robert  H
>
> >
> > Pretty much.  The sonotube was first wrapped with 3mil
> > poly however, to provide a mold release.  The sonotube
> > was mounted over a 22' steel arbor, as the paper tube
> > by itself was not rigid enough.  A winding jig supported
> > the steel arbor on both ends and rotated the tube for
> > placing the wire using a 2HP gearmotor.  After fully
> > wound, the coilform received a 1" thick fiberglass layup
> > using a chopper gun.
> > After the glass kicked, a router cut two fixed depth
> > grooves down the inside of the sonotube, and a pressure
> > washer removed most of the sonotube from the inside.
> > The mess in the parking lot was substantial.
> >
> >
> > -GL