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Re: [TCML] Primary coil winding troubles with 1/4" tubing

Hi Brian,

I see a couple of problems with your technique.

The biggest problem is that the primary support strips that you made don't
adequately hold the tubing.  You want a strip that you can push each
winding into, and there is stays, so you can just focus on placing the next
segment of tubing into the next strip; you don't want to have to look back
and re-do what's already been placed.  I was fortunate enough to have a
machinist friend that make me some Lexan strips using a milling machine,
but if I had to, I could have made something less polished using a table
saw to cut the slots.  You can see my strips (combs) at

The other problem I see is that you want more than four supports per turn,
ideally 6-8, depending on the outer diameter.  The turns are just too
floppy if you only have four.

Also, I think you want to start at the inside and work your way out.

Regards, Gary Lau

On Sat, Mar 24, 2012 at 11:28 PM, Brian Hall <brianh4242@xxxxxxxxxxx> wrote:

> The video kind of speaks for itself
> http://www.youtube.com/watch?v=i5j8V19qK1M
> I had a heck of a time figuring out to coil that tubing for the primary
> from the inside out or the outside in.  It was sort of layered on top of
> itself as well, which led to those kinks in the middle you see which make
> for unsightly misalignment that ... well, I am open to ideas on how to
> straighten out what I put together so far there, please.
> Even after I have spend a couple years or more researching here and
> scouring TC websites and many dozens of videos, my experience as you see is
> - that you have to actually try putting it together in order to really gain
> the knowledge of what to do, and what not to do.
> To those who have put together nice clean flat primary spirals - what is
> the secret to not having kinks like that?  How to you handle copper tubing
> that comes in a double thick roll like the 50' length I got that and make
> it into one flat spiral in a clean and nice looking way?
> ----------------------------------
> Brian Hall
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