On Fri, 25 Mar 2011 01:55:16 -0400, "Tom Gardner" w@w wrote:


"Larry Jaques" wrote in message
.. .
On Thu, 24 Mar 2011 19:07:21 -0600, F. George McDuffee
wrote:

crush bending - A non-mandrel method of bending in which the
compression of the intrados is controlled by stretching it
over a "crush knob" seated in the cavity of the bend die.
This eliminates the wrinkling or buckling that might occur
if the tube were bend without a mandrel. Commonly used on
non-round tube bends.

Yeah, that's the style I was suggesting. I didn't know the
terminology.


The sample is crush bent. I'll be collating all the info I've been
gathering and canvass local fabricators. There used to be hundreds of
little shops in Cleveland that could do this, I'll be lucky to find
six.

Six shops still there, only one of which who can still do crush work,
but they'll want an arm, a leg, and your firstborn? That's how my
luck runs, too.

I'll bet the largest local library sees you researching the
engineering books for crush-bend specs, too, huh?

--
Make up your mind to act decidedly and take the consequences.
No good is ever done in this world by hesitation.
-- Thomas H. Huxley