Carl the way I would do this is to get some 8" OD steel pipe.
Weld Plates on the ends so I can be turned between centers on a lathe....
Turn it down to your Id.
Cold soak the steel with LN2....
Heat the aluminum pipe.....
Shrink the aluminum over the pipe....
(This will true up the pipe )
Now turn down the outside, leaving some beefy end on the aluminum pipe....
Now set up to pull the aluminum off the steel, IE Press or cable pull....
Put LN2 inside the steel and heat the Al, till it comes off...
No way that thickness of pipe is gong to stay true over 24" for turning...
If one had to do many many of these, I'd set the steel up with a slot that
had a machined piece go in....
IE Set up steel pipe in mill and machine opposing Tee slots on both sides
of length wise slot....
Machine piece for slot, drive into pipe....
Machine round, drive piece out of slot install aluminum reinstall piece in
slot... when time to remove aluminum drive piece out of slots...
Might also need parts inside pipe to pull both sides together to collapse
slot....
Turn down
On Wed, Dec 5, 2018 at 7:05 PM Carl Tedesco <ctedesco@xxxxxxxxxxxxxx> wrote:
All,
Does anyone have a recommendation for a shop (preferably in the Southern
California area) that can machine aluminum pipe (modify OD & ID and make
round)?
I want to take a 24” length of 8” diameter 6061-T6 pipe and machine the OD
to 7.708” with the wall thickness at 0.300”. A local shop wants to lathe
it from both ends, but cannot guarantee there will be a step in the middle.
Thanks in advance,
Carl Tedesco