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<font size="+1"><font face="Comic Sans MS"> I fooled around with
swaging today. I made a die from a bit of scrap tubing by
cutting a 10 degree internal taper in one end. The tube is
.975" ID. I cut off a 4" bit of thin walled (.03"?) aluminum
tube for the test. With the die in the lathe chuck I pushed the
aluminum into the die with the tail stock ram. It was very hard
going. I only got about a 1/4 inch swage, which was very ugly
looking and out of round. I thought shrinking it .025" would
be easy! I just used wd40 for lube, so another lubrication
might work better. I'm thinking of holding the tube in a collet
mounted to my hydraulic press. I think I can make a much
shorter die so there is less friction. I could push the die
over the tube with a short bit of pipe. <br>
<br>
Since the aluminum was so ugly anyway I experimented runing the
knurling tool over it to see if I could roll shrink it. I used
the regular knurling wheels so it got chewed up a bit. I was
afraid to put too much pressure on it as the tube might
collapse. I've seen pictures of a three wheeled roller swage
which you compressed with a taper over the rotating work. I'll
have to play with that idea as well as the press methode.
Anyway it will be a good excuse to make a video....<br>
<br>
Alex Fraser wrote on 1/16/2017 7:37 PM:
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<font size="+1"><font face="Comic Sans MS">Thanks, I've seen
those. I am thinking of shrinking the end of a tube. It
would look like the end of a high powered rifle
cartridge. I think it's called a bottle neck.<br>
I've reloaded ammo and it's easy to run a die down on a
brass cartridge. Tubes don't have a base to resist the
pressure so you would have to figure out a way to hold the
tube. I have some 5-c collets that might work, they go
up to an inch. Also how much I can reduce aluminum with
out cracking it is unknown to me. I'll have to play
around with some dies.<br>
<br>
<a class="moz-txt-link-abbreviated"
href="mailto:lstoskopf@cox.net">lstoskopf@cox.net</a>
wrote on 1/16/2017 3:49 PM:
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<pre wrap="">Harbor Freight has some neat tools cheap to expand tubing. Works well with aluminum. Buy the set. N0UU
<a class="moz-txt-link-freetext" href="http://www.harborfreight.com/catalogsearch/result?q=tubing+expanders">http://www.harborfreight.com/catalogsearch/result?q=tubing+expanders</a>
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