On Dec 12, 7:52*pm, Bob Engelhardt wrote:
Skip down to 3:00http://www.youtube.com/watch?v=m_-iPpEuWRA

I don't know if, technically, they are _slip_ rolls, since I don't see
how any of the rolls would open. *Still interesting, though, & much
simpler than most. *Especially using the cranks & link in place of gears
or sprockets & chain.

The action is somewhat different than the usual slip rolls in that the
material is not pinched between drive rolls.

Is there a specific name for this type of roll?

Bob

The roll arrangement that he has is similar to the one on my HF 3 in 1
shear/brake/roll except that the bending roll on mine can be quick-
released. I thought that the "slip" in slip rolls meant that the
bending roll was not gear-driven (like the feed rollers) and therefore
allowed to slip with the workpiece. However I see that your use of
the word is more proper. There's a reference to slip rolls in an old
book on sheet-metal work by Joseph Rose:
http://books.google.com/books?id=YDY...page&q&f=false
Maybe the one in the video can be just called a "roll forming
machine" (i.e. without the "slip" as a modifier.)