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How to wind a perfect coil condenser...

I would expect this topic to have multiple posts by the same person showing us how to do something. If there are pictures, let pint_o_shine know and he can host them for you.

Re: How to wind a perfect coil condenser...

Postby vb » Wed Nov 17, 2010 10:18 am

I bought a box of tubing a while ago, with the intention of winding up a coil for a new column. just haven't got to it yet
nice to see that its not impossible to wind a coil without ruining the tubing.
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Re: How to wind a perfect coil condenser...

Postby Azframer » Wed Nov 17, 2010 1:20 pm

Yea but the slide show does not show that a few curse words were used, they would be a few if I was doing it. But it is a great show on how to that is for sure.
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Re: How to wind a perfect coil condenser...

Postby Mud » Wed Nov 17, 2010 7:03 pm

Violentblue wrote:I bought a box of tubing a while ago, with the intention of winding up a coil for a new column. just haven't got to it yet
nice to see that its not impossible to wind a coil without ruining the tubing.


Does your husband know you do that? What you need is a little arm strength you pansie. Pull hard on the tubing while you wrap it around a mandrel and it won't kink. Hold it like a little girl with frail hands and a weak constitution and you might as well quit while you're ahead and buy one.

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Re: How to wind a perfect coil condenser...

Postby vb » Wed Nov 17, 2010 9:30 pm

Mud wrote:
Violentblue wrote:I bought a box of tubing a while ago, with the intention of winding up a coil for a new column. just haven't got to it yet
nice to see that its not impossible to wind a coil without ruining the tubing.


Does your husband know you do that? What you need is a little arm strength you pansie. Pull hard on the tubing while you wrap it around a mandrel and it won't kink. Hold it like a little girl with frail hands and a weak constitution and you might as well quit while you're ahead and buy one.

I'mVBAndMyGrannyWindsMyCoils

:roflmao:
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Re: How to wind a perfect coil condenser...

Postby zedzedtop » Sun Feb 13, 2011 12:22 am

Any idea if those spring benders work ok on 5/8 od annealed? I'm going to try to wrap 50' of it around a 3 1/8'' pipe. Spring benders are cheap from mcmaster, and the cheapest bender (the kind with the two arms and grooves) is about 150 bucks. I spent hours getting the whole length (still fairly coiled from box) filled to the brim with water, and it still wants to kink like all hell. So... spring benders ok for 5/8''?
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Re: How to wind a perfect coil condenser...

Postby cunningfellow » Tue Dec 27, 2011 5:46 pm

My contribution to coil winding mandrels.

Start with a 19mm bit of gal pipe from Bunnies. Whack it with a hammer so it ends up square. Use your socket driver as a handle.

The ratchet is probably a lot more convenient than a fixed crank handle.

My other deviation was to get a hacksaw to a bit more of the gal pipe. I then bent a small 1/2 tube and (embarrassingly badly) welded that to the pipe. This was is lieu of the eyelets/cable-ties.
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Re: How to wind a perfect coil condenser...

Postby cunningfellow » Tue Dec 27, 2011 6:02 pm

Oh, and while I was there, I hacksawed open a test bend.

The ellipse inside was 5.6mm x 3.2mm.

It was also a bit square so the Pi*A*B approximation will be unfair to it.

Even still 14.1mm^2 area for the flattened pipe V's 15.5mm^2 for the round pipe only looses 10% of its area from the winding.
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How much (length) of tubing is needed to build a Double Coil

Postby varocketry » Sat Sep 13, 2014 3:25 pm

I don't see that anyone answered REBELL YELL's question on page 1.

I'd swear I'd seen it discussed in a thread somewhere but I've been searching now for an hour .......

How much (length) of tubing is needed to build a Double Coil of finished coil length seven (7) inches?

I'm using 3/8 OD tubing.

Is there a working rule of thumb for new builders?
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Re: How to wind a perfect coil condenser...

Postby NineInchNails » Sat Sep 13, 2014 3:49 pm

This can be easily determined using a similar diameter rope wound around a mandrel. I'm sure there are some variables for instance the gap between the spiral and the distance between the inner and outer coil. The difference may be slim but still a difference. Probably not worth a mathematical formula. Try rope.
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How much (length) of tubing is needed to build a Double Coil

Postby varocketry » Sat Sep 13, 2014 3:55 pm

Thanks NIN.

No rope around so I used a 50' coil of extension cord.

Using 6 inch pigtails, it took 14.5 feet of a 50' electrical extension cord to make a tightly wrapped Double Coil. So that's probably the MAX length needed as the 3/8 OD tubing would be wrapped with 1/8 inch spacing.

Back to HD I go as I bought a ten foot length.
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Plan Ahead -- OK ... laugh at me

Postby varocketry » Sun Sep 14, 2014 6:30 pm

Here's the pics of the water filled tubing.

You can figure it out ...

coil pic1.jpg


coil pic2.jpg
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Re: How to wind a perfect coil condenser...

Postby varocketry » Sun Sep 14, 2014 8:54 pm

Coil pic3.jpg


Coil pic4.jpg


Coil pic5.jpg
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Re: How to wind a perfect coil condenser...

Postby varocketry » Sun Sep 14, 2014 8:56 pm

Coil pic6.jpg


Coil pic7.jpg
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Re: How to wind a perfect coil condenser...

Postby NineInchNails » Sun Sep 14, 2014 9:00 pm

I am a little confused as to what I am seeing in these photos, could you elaborate? I assume you filled your copper tube with water or filled with water and froze it. That is about all I can or gather from what I think I see in the photos.
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Re: How to wind a perfect coil condenser...

Postby varocketry » Sun Sep 14, 2014 9:13 pm

NIN:

Filled it with water, pressure fed from garden hose. Crimped both ends with no air in the tubing. Then realized the flattened tubing would n't fit through the eyelets of the coil winder. Didn't plan ahead!

So I positioned it vertically in the vise, cut end off, slipped on the eyelets of the coil winder, squeezed the tube closed, and flattened then bent the end over to seal it again.

It's ready to install on the coil winding mandrel.
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