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Re: Primary Materials (fwd)



---------- Forwarded message ----------
Date: Mon, 20 Jul 1998 01:10:06 -0500
From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Primary Materials (fwd)

> Date:          Sun, 19 Jul 1998 21:25:22 -0600 (MDT)
> To:            tesla-at-pupman-dot-com
> Subject:       Primary Materials (fwd)
> From:          Tesla List <tesla-at-pupman-dot-com>

> 
> 
> ---------- Forwarded message ----------
> Date: Sun, 19 Jul 1998 00:42:11 -0500
> From: Adam Parker <park_e_r-at-hiwaay-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Primary Materials
> 
> Once again a fledgling coiler has yet another question. Yesterday I made my
> flat pancake coil form out of four pieces of 1/2 inch PVC mounted radially
> on some painted plywood. After making my coilform, I tried winding the
> thing with thin-wall 1/4 copper tubing. I had trouble. The tubing kept
> kinking and never formed a good circle. After struggling with about 6 turns
> I called it quits and removed the tubing. Yesterday's fiasco has swayed me
> to winding the primary with coax. Now, will using coax reduce coil
> performance? I thought maybe eventually I could try tubing again and
> replace it if it does. Do you use both coax conducters or just the outer
> sheilding? One the coil masters out there should write an article on
> primary winding (RQ seems pretty with that type of thing) Well, anyway, my
> next post will either be me asking for help with trouble shooting my
> completed coil or a link to some great operating pictures. I'm hoping for
> the later. Thanks Again,
> 
> Adam 
> 
> 
Adam,

Cut slots in the PVC former strips that your copper tubing will press 
down into from the top.  I use a drillbit just larger than the tubing 
and then saw into the edges of each hole with a bandsaw.  This makes 
a nice slot with a round bottom.  If you saw carefully you can make 
the slot width a tight pressfit which will hold the tubing captive 
once seated in place.  Pre-form the copper tubing into the flat spiral 
you want first on a large flat surface and then gently lay this on 
top of your completed primary support and simply press the copper 
into the slots, working in a spiral outwards from the innermost 
mounting position.

Good luck.

 
Robert W. Stephens
Director
Lindsay Scientific Co.
RR1 Shelburne, ON Canada L0N-1S5
Tel or AutoFax: 1-519-925-1771    
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