All,
I know this is an old thread, but since it was what I found during a search, I thought I'd add a data point (BTW, I understand also that the original poster wanted to know if soft copper tube could be bent with conduit tooling, but the discussion morphed toward forming hard copper L and M pipe, which was my issue...):
This afternoon, I attempted to use my Pro Tools 105 tube bender with a 7/8" x 3.5" radius die to bend both L and M 3/4" pipe (7/8" O.D.). Three attempts, three failures....The first attempt with the L pipe was the closest to a success, but there was a significant amount of wrinkling on the inside of the bend. The second attempt with the L pipe actually broke the pipe after 40 degrees of bend. The only attempt with the M pipe broke the pipe with less than 20 degrees of bend completed!
I appreciate the tips you guys posted in this thread; there are other options for me to try. I just wanted to share my experience with this process using what might be common tools and materials for others.
Thanks,
Jon