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Re: Need Help with 15 degree Primary Support System
Don,
One suggestion I've seen, and one I plan on trying, (I'm a newbie too)
is cutting strips of perf board. You know, the perforated masonite
panels used to hang tools. They are available in various sizes, and
you pick the hole size to match the OD of the tubing you're winding.
You layout the ends, after cutting the strips, in a spiral to give the
proper pitch for the coil. The spacing is handled by the hole spacing
on the perf board. Hope this makes sense. I haven't got that far yet,
(still scrounging NST's).
Jim
Tesla List wrote:
> Original Poster: Don Allen <dona-at-amigo-dot-net>
>
> Hi All,
>
> I'm soliciting any tips, suggestions or hints on building a support
> system for a 15 degree, 16 turn primary using 1/4" copper tubing
> for my 15kv 60ma 6" secondary system. Spacing is 1/4" between
> turns OD, and 1/2" center-to-center. I derived the 16 turn from
> data input into Wintesla program.
>
> I had initially tried putting in 8 wooden supports at slightly more
> than 8 inches in length to give me the 16 turns out of 1x4 for
> the wood. I used 1/4" coax cable naildowns spacely evenly
> along the top of the wood but the entire affair ended up as a
> disaster and I had to remove everything before I actually put the
> whole length of tubing in. The coax supports weren't deep enough
> to hold the pipe in place when I tried a small length of pipe in
> them, as the tubing kept popping up and out. I used silicone
> glue to fasten the cable holdowns to the top of the wood but this
> proved to be a mistake. I then tried putting small brad nails through
> the hole provided in the coax naildowns but they split the wood and
> it also gave me a concern for providing a path to promote arcing
> from turn to turn of the tubing.
>
> I ended up in frustration removing all the supports to start over.
>
> I know there HAS to be a better method. I would appreciate
> any help from some of you old vet coilers on this.
>
> I also did try cutting notches into the wood 1/4" to make the
> u-shaped channels for the tubing but I couldn't get an even
> depth and it kept splitting the wood. Apparently using a 1x4
> isn't necessarily a good choice of wood.
>
> Also, I need to know is it better to start the winding of the
> tubing from inside to outside?
>
> Thanks,
>
> Don
>
> ---
>
> "Resistance to tyrants is obedience to God" - Thomas Jefferson