Subject: AL Angle Stiffness

From: [email-masked] (Edk4)
Date: 15 May 1996 13:43:00 -0400

Thanks to all who entered this fray. I think I understand the difference
now
between stiffness and ultimate yield strength.

What I'm still puzzled about concerns the application. 

I have a 5C rotary indexer (similar to a Spin Index Fixture) which, as 
designed, can only be used in the horizontal position. I'd like to be able
to
use it in the vertical position, and that requires something like an 
angle 
plate. It would have to be about 4"x6"x4" to work on my mill.

I ran across a piece of 4"x6"x3/4" thick, 6061-T6 AL angle recently, and
my
questions regarding relative strenghs of alloys and stiffness vs tensile
strength
were directed at determining whether it would be suitable for the job.
I've always
considered that steel was the better material, but I don't have a source
of thick
steel angle, in small lengths.

I expect that the AL angle would be more than adequate. Any comments?

------------------
Ed Kingsley

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From: "John R. Johnson" <[email-masked]>
Date: Wed, 15 May 1996 15:03:38 -0500

Should work fine, Ed.  I will let you figure out how to scrape it to a
true 90 degrees!
John

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From: [email-masked] (Peter Brooks)
Date: 21 May 1996 19:20:15 GMT

As someone noted, a cast iron plate should do the job a lot better.  I have
an Enco special in about that size, and it seems reasonably well made, plus
with the extra material in the vee, it's pretty stiff.  Not sure of the
cost, but it's a whole lot less grief than adapting a chunk of structural
angle, whether steel or aluminum.

Pete Brooks