[AMPS] Re: Tank coils

[Jim]

I simply wind my copper coils (1/4" and 3/16" and 3/8")  on a round form of
some kind......a 2.5 inch piece of black abs pipe......a propane
cylinder........a round block of wood......... anything that is the desired
diameter......

No need to stretch, heat or any other special treatment......I buy the 50
foot coils at Home depot, etc.   Just leave the coil coiled up. DO NOT
un-wind the coil as you have purchased it. This "work hardens" the copper.
Have someone help you.....Just wind on the form.....nice and smooth.....Then
use your fingers to space and form just exactly the way you need it after
the winding is completed......

Common guys!  This not rocket science !


Jim W7RY



-----Original Message-----
From: Fisher <fisher@pldi.net>
To: Gerald Caouette <ve6nap@oanet.com>; Amps Reflector <amps@contesting.com>
Date: Tuesday, January 18, 2000 12:59 PM
Subject: Re: [AMPS] Re: Tank coils


>
>Hi All -
>
>Thanks for all replies.
>
>I got a small tubing bender just for the occasion and experimented with it
>without sand or trying to soften the tubing.  I was surprised out how
>difficult it was to work with the stuff, and that is what prompted my
>question to the group.
>
>Can anyone expand a little bit on the actual winding process?
>
>Gerald VE6NAP, I happen to have a 3/4 HP wood lathe.  How do you mean to
use
>a lathe to wind it?
>
>Thanks, Lu K5YP
>
>
>>I would try using a tubing bend and bend it in 90 degree segments. You can
>>get them at Lowe's or Home Depot.
>>Mike(y)
>>W3SLK
>
>> Copper is unlike ferrous metals that temper when cooled quickly
>> it goes soft  _ water - cooling will allow it to become very workable
>> clean the surface prior to forming  and have silver plated after
>> item has been formed
>> note to much heat and you then get into other problems such as Hydrogen
>> Embritlement
>> if you dip in water or air cool
>>
>> I find it best to have a friend with a lathe do the forming with out
>> heating the tubing ...
>> as the tube will spring back somewhat the mandrill has to be a bit
>> undersize ....
>> 73
>> de
>> ve6nap@rac.ca
>
>
>
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>


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