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EXTRUSO2.gif

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This is a picture of a type of finned heatsink material that
is needed for a project.  Posted by David Pincus <dpincus@erols.com>. 
David posted the following in rec.crafts.metalworking:

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I am trying to build a prototype device that will contain an axially finned
aluminum pipe. Since I have not yet found a commercial off-the-shelf
source for such pipe, I think it will have to be made. The question is how? 
I've attached a photo that shows the basic configuration of the finned
pipe: http://208.206.118.52/dropbox/EXTRUSO2.gif.

The basic dimensions would be about 3" overall O.D., with the inner pipe
being about 1.5" I.D. The walls of the pipe would be about .15" each,
leaving about .6" height for the fins. The pipe length would be 2 feet.
For production manufacturing I'm assuming that an extrusion would be the 
way to go, but for a prototype, where the dimensions might need to be 
changed a great deal to get the heat transfer performance within spec, the
cost of making a one-time die would be more than I could afford. So how
else can this be done? Casting, Machining, Extruding or what?
Any ideas on this would be appreciated. ALSO, if anyone knows of a 
source for this type of piping that would be commercially available 
off-the-shelf, even if not exactly the right dimensions, would also be of 
great help.Thank you very much.

Respectfully,David Pincus