On Mon, 08 Sep 2008 15:07:21 -0800, Jon Anderson
wrote:

wrote:

Hex is easy- but octagonal?

Could take square and knock the corners off, but that's a fair bit of
removal.

It's for an ultra high tech carbon fiber violin bow,
octagonal profile matches the bow so hex won't cut it.
Options are octagon, knurl, or some sort of shallow fluting.
But not worth the time/expense of profiling the OD to get
the octagon.

(dang, wish my Omniturn had the indexing spindle!)

Jon
========
You may want to contact the custom aluminum extrusion houses.
They may have a stock die for what you want, or for this simple a
profile it should be cheap to edm one. Be sure to check material
and physical properties/temper. A few places you can try
http://www.paramountextrusions.com/shapes.htm
http://www.zycon.com/Products/Alumin...Zin Aod5mgKjQ

web page showing octagons
http://www.argylein.com/extrudes.html
http://www.argylein.com/search_dies-n.php?words=OCT


google on octagon "aluminum extrusions" for c. 700 hits.
register on
http://www.globalspec.com/MyGlobalSp...rID=-136104688
for a bunch more.