In article , Ed Huntress
wrote:

On Fri, 08 May 2015 09:21:01 -0400, Joe Gwinn
wrote:

In article , Ed Huntress
wrote:

On Thu, 7 May 2015 21:32:55 -0400, "Jim Wilkins"
wrote:

wrote in message
.. .
On 8 May 2015 01:04:48 GMT, "DoN. Nichols"

wrote:

On 2015-05-05, Bob Gentry wrote:
On Tue, 05 May 2015 12:43:18 -0400, Ed Huntress
wrote:

snip

Mild steel will be as stiff and rigid as any steel -- they all
have
the same stiffness -- but it won't be particularly strong.
However,
you're not likely to approach the strength limitations of mild
steel
or any other steel in this application. If you did, the toolholder
would be springing so much you couldn't use it anyway.

Ed
Thanks for the insight!

I've never used 12L14 and I've heard it is easier to cut and gives
a
nice finish. Would you see any problems with that in this
application
(just to try something new) ?

Just bear in mind that 12L14 does not weld well. But it is a
beautiful material to machine in the lathe. (Not tried it in the
shaper
yet.)

Good Luck,
DoN.
Lathe, shaper, or mill, leaded steel is the easiest to machine and
make a nice finish -aka free machining steel - of which 12L14 is one
type. As easy to machine as 6061T6 AL or breass.

How is 1144 Stressproof?

AISI 1144, ASTM A311, and some other SAE grade describe the same basic
alloy. Stressproof is a patented steel, and the patent is the way 1144
is rolled, drawn, and heat-treated. It's drawn really hard.

Stressproof is intended to be used without further heat treatment.
It's a good grade for a lot of hobby applications because of that
fact, plus the facts that it machines well, it's very stable, and it
combines good ductility with around 100,000 psi yield strength.

Do you know the patent number, or the patentee and date? I'm curious.

All I know is that Niagara LaSalle says they created it in 1938:

http://www.niagaralasalle.com/product-stressproof.html

Other sources seem to agree.

This was enough of a clue. A patent search on Lasalle (assignee) and
cold processed steel as the search terms yielded about 50 hits, almost
all being relevant. Probably their FatigueProof steel is in there as
well. The first patent I looked at seems to be it: 2,880,855, which
gives the chemical analysis, which matches what Niagara-Lasalle states.
This patent is from 1955, but probably references the 1938 era patent.

Joe Gwinn