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EMY Conduit bending update

This is what is generically called "crush" bending. Generally this allows a smaller radius bend and the material on the inside of the bend does not have to be compressed as much, although there may be some increase. I think the Gingery dies could be modified to do crush bending by including a rib or ridge on the center of the inside die [make in three pieces?].

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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.

crush knob ? A raised section of a bend die cavity over which the intrados is stretch to alleviate the compression, thus eliminate wrinkling and buckling.

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{see pages 17/18}

-- Unka George (George McDuffee) .............................. The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953).

Reply to
F. George McDuffee
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Yeah, that's the style I was suggesting. I didn't know the terminology.

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

Reply to
Larry Jaques

I wonder if a better handle injection molded that would have a replaceable brush end would work.

John

Reply to
John

"F. George McDuffee" wrote in message news: snipped-for-privacy@4ax.com...

Yep, the sample IS "crush bent". Nice primer!

Reply to
Tom Gardner

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.

Reply to
Tom Gardner

Nah - it'd be much cheaper to just bend some plastic tube, or extrude the plastic into a jig, but it'd still be quicker to hand- bend them from conduit - hot plastic needs to be cooled to retain its form. (Yes, I have experience working at an extruder place.)

Cheers! Rich

Reply to
Rich Grise

I'd also stick something like a bike handlebar handgrip thing on the proximal end, and maybe some kind of sleeve down the angled part of the handle. A bare metal handle, especially at 1/2" diameter, is just icky.

Cheers! Rich

Reply to
Rich Grise

When you find one of the six, make sure you ask what day the auction is. ;)

Wes

Reply to
Wes

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

Reply to
Larry Jaques

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