Anyone know of a source for aluminum bar in an octagonal
cross section? 5/16 or 9mm across flats, prefer 6061 to
insure anodize color match with a related part. I'm guessing
this is not available, haven't found anything via Google,
but thought I'd ask anyway.

Jon

On Sep 8, 6:26 pm, Jon Anderson wrote:
Anyone know of a source for aluminum bar in an octagonal
cross section? 5/16 or 9mm across flats, prefer 6061 to
insure anodize color match with a related part. I'm guessing
this is not available, haven't found anything via Google,
but thought I'd ask anyway.

Jon


Hex is easy- but octagonal?

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


Dave

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

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.

F. George McDuffee wrote:

You may want to contact the custom aluminum extrusion houses.

Only problem with extruders is the minimums. A single 20'
length would be a several year supply. And there are two
other sizes I need to make. A 1000lb order which is a common
min. order would last for several centuries! Customer is not
unwilling to invest, but probably not for inventory that
will outlast him and his kids.... G

Think I've figured out an approach though, will just chamfer
mill short lengths of material in the mill, then turn. Not
the most efficient approach, but it's a low volume high
value part that would certainly justify it.


Jon

On Sep 9, 12:33*pm, Jon Anderson wrote:

Think I've figured out an approach though, will just chamfer
mill short lengths of material in the mill, then turn. Not
the most efficient approach, but it's a low volume high
value part that would certainly justify it.

Jon

For short lengths a 5C spin index should work well.

On Sep 8, 5:26*pm, Jon Anderson wrote:
Anyone know of a source for aluminum bar in an octagonal
cross section? 5/16 or 9mm across flats, prefer 6061 to
insure anodize color match with a related part. I'm guessing
this is not available, haven't found anything via Google,
but thought I'd ask anyway.

Jon

If you go to VarmintAls.com , I hope that URL is correct, click on his
Mini-Lathe page and scroll down to a direct link to Online Metals. I
was just browsing their site today and I am pretty sure I saw some Hex
or octagonal bar stock but I am not sure of the alloy number.


Dennis

TwoGuns wrote:

I am pretty sure I saw some Hex or octagonal bar stock but I am not sure of the alloy number.

Thanks, I tried all the online sources I could think of,
nobody has it. Funny though, lots of places list weight per
foot for octagon materials, nobody supplies it....


Jon

Try this site

http://www.speedymetals.com/default.aspx


--
Bruce

"You know that old Beach Boys song, Bomb Iran? Bomb bomb bomb, bomb bomb
Iran."
John McSame , More Bush in more places!!!

On Sep 8, 4:26*pm, Jon Anderson wrote:
Anyone know of a source for aluminum bar in an octagonal
cross section? 5/16 or 9mm across flats, prefer 6061 to
insure anodize color match with a related part. I'm guessing
this is not available, haven't found anything via Google,
but thought I'd ask anyway.

Jon

You COULD set up a mini-rolling mill to produce the cross section you
need, my guess would be that you could use rollers maybe 3-4" in dia.
with the desired cross-section cut in them and T0 hardness stock.
Oven treat afterwards. Would save a lot of mill time if it'd work.

Stan