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On Tue, 18 Jan 2011 00:34:43 GMT, (dan) wrote:

RogerN wrote in
rec.crafts.metalworking on Mon, 17 Jan 2011 17:43:08 -0600:

Metalworking, resizing copper tubing-

I measured the tubing and reads around .655", about .030" too big. I was
able to taper the end of the copper and hammer the compression nut onto the
tubing, this "sized" the tubing enough to get the compression sleeve on and
I got the valve on the line, but I would like to fix it better later.

I could either shrink the tubing down to .625" or expand to solder a
correctly sized tubing inside the end of the old tubing.

Could you bore out one side of a coupling, and add a short length of
the proper sized tubing? Hmm, .030 is probably too much for a common
coupling to be bored out. Could you make a coupling(f/m adaptor?)
from a piece of brass?
Just get some emery cloth and sand down the outside of the pipe a wee
bit and solder a 5/8 to 1/5 adapter on. Might need to heat the adapter
a bit - copper grows significantly when heated.
I'm ASSuming the 5.8" tubing is "soft" copper??? Most "hard" copper is
1/2 or 3/4".