[Amps] Question about low frequency tank coil forms?

[Will Matney]

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. 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. This would allow the lathe operation to be 
made without an interrupted cut. When mounted in an air flow, this would 
allow cooling of the coil. With todays technology, any material could be 
machined with a laser, forming the holes on a CNC machining center. It 
can't burn because the assist gas is a noble gas like Argon or C02. It 
couldn't ignite and would be cooled immediately. Even using high speed 
tooling, like a two flute end mill, would fly through this material like 
butter. I would bet that this step wouldn't add much to the price 
either. This would make an extra stout form with the cooling advantages 
needed. That would be the berries in a rotary inductor too! The reason 
for this posting is that if anyone from an inductor manufacturer happens 
by here, they can have the idea. Any thoughts on this?

Will Matney