[Amps] Question about low frequency tank coil forms?

[Will Matney]

Jason,
I think you misunderstand, I'm speaking of slotting or drilling the 
insulated core/form and not the conductor. This would allow air to pass 
through the insulated form, around the back side of the coils, in spots 
determined by the slots or holes. The holes or slots would have to be 
small enough so the the wire wouldn't have flat spots on a roller 
inductor so the roller would keep in contact with the wire coil. I would 
think 1/4" holes in a staggered pattern would allow 14 to 12 gage wire 
to remain circular around the core. Matter of fact, you could plug off 
one side of the tubular core and put forced air in the other end. This 
would force air out of the holes in behind the turns of the coil making 
the core a plenum.

Will Matney

jsb at digistar.com wrote:

>On Fri, 3 Sep 2004, Will Matney wrote:
>
>  
>
>>After answering an earlier question to Rob about cores in low frequency
>>tank coils, something hit me. What if the core had a series of holes
>>close together about 1/2" in diameter all around its circumference. This
>>would look something like taking a piece of perforated steel or aluminum
>>having 1/2" holes and wrapping it up into a tube. The spacing would need
>>to be a little farther apart, and have a staggered pattern, in order to
>>turn groves for the conductors.
>>    
>>
>
>Akin to plumber's tape but made out of copper?
>
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>>Another route would be to burn or machine longitudinal grooves about
>>1/4" wide, spaced about every 1/2"  apart around the circumference.
>>Actually the wire groves could be made first before the air holes.
>>    
>>
>
>1/4" copper tubing with slices cut out of the sides of the tubing for the
>entire length of the coil?  That's an interesting idea.  But wouldn't that
>make the coil set up impeadance problems as would copper strap braid?
>
>
>73 Jason N1SU
>
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