Re: [TCML] Joining two 25 foot rolls of copper tubing

[Yurtle Turtle <yurtle_t@xxxxxxxxx>]

I've done it twice; once with a brass bolt that fit snugly inside, and once with a piece of solid copper wire that fit snugly inside. I used flux, hit it with silver solder then quickly wiped the joints with a rag. Both times, the result was smooth, and had a slight neck - not buldge - due to the way a tubing cutter works. The first time I managed to continue threading the tubing through the primary support holes, so no real problem with flexibility.

Adam

--- On Thu, 5/20/10, dave pierson <dave_p@xxxxxxxxxxx> wrote:

> From: dave pierson <dave_p@xxxxxxxxxxx>
> Subject: Re: [TCML] Joining two 25 foot rolls of copper tubing
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Thursday, May 20, 2010, 7:44 AM
> 
> 
> New dwp:     dave_p@xxxxxxxxxxx
> 
> > I have two 25 foot rolls of 1/4 copper tubing. I could
> not see how it
> > might be possible to join the two rolls to make a
> spiral primary. So
> > I ordered a 50 foot roll. But I'm curious if anyone
> has joined two
> > such rolls? 
>     I haven't, however have done analagous things
> in plumbing,
>     in the old solder copper pipes days, albeit
> with larger 
>     tubing.  Generally 1/4" dia tubing is
> joined with 'compression
>     fittings', not real applicable here.
> 
>     Larger bore plumbing uses 'sweat soldering'
> of purpose
>     designed couplings.  If of interest,
> will describe,
>     tho hopefully better description on the web
> somewhere?
>     trick would be to find 'coupling fitting',
> likely have
>     to fake one with slightly larger
> tubing.  Some ways
>     simpler than plumbing work: no need to be
> water tight.
> 
>     Another approach would be to sweat solder a
> solid 'pin',
>     snug fit to the bore of the tube, mebbe an
> inch long?
>     
>     a third would be to file/etc mating
> 'dovetail' joints,
>     then try to 'butt solder'.  weakish.
> 
>     ANY of these will leave a mild bulge, tho
> last two not
>     so much: I'd not expect problems, tho, if
> turns are close..
> 
>     ANY would want care in filing/sanding
> afterwards, to smooth
>     out potential Corona Points.
> 
>     ANY would create more or less stiff/hard
> spot: bending to
>     form winding would want care.
> 
>     If any better suggestions offered, so much
> the better.
> 
>     best
>      dwp
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