Ken Moffett KMoffett mn.rr.com wrote:
John Doe jdoe usenet.love.invalid wrote

I need to crimp and bend some aluminum tubing in various places.
I might want to crimp the aluminum tubing and then bend it at the
crimped point.
I'm going to use those points for drilling and connecting to
either small diameter metal rod or connecting two aluminum tubes
together. I'm planning to buy a reasonable size vice and maybe
attach half of a steel pipe to each jaw.

Don't use a vice. It's not designed for that. One of my students
tried crimping the end of a 3/4" aluminum tub. Royally screwed up
the a vice. The vice jaws are a "lever arm" that extends several
inches out from the center of force, the screw. Mechanical
advantage is the wrong way around. Better to buy a cheap hydraulic
press at HF or Northern Tool.

Vice jaws are a lever arm? However true your terminology, force is
force is force. I mean, what difference does it make if you aren't
putting any more force on the vice than you normally apply for any
other function. While practicing today, I crimped the aluminum
tubing until it was flat and the aluminum sides broke while applying
less force than I have often put on the vice many times before.

You're not supposed to put a lot of pressure on a vice? I always
thought too much pressure was like when the key/arm was bent out of
shape.







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Newsgroups: rec.crafts.metalworking
Subject: crimping/bending aluminum tubing?
From: Ken Moffett KMoffett mn.rr.com
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