On Dec 15, 12:58*pm, Bob Engelhardt wrote:
Denis G. wrote:
*... * 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. *...

Don't put too much credence in my use - I probably just made it up G.



Bob E: Glad to be of service.;-))

BTW the "slip" part comes from the fact that the outside bearing of
the top roll can EASILY be disengaged to allow a closed cylinder to be
slipped from the roll former.

For really large pressure vessels (oil refineries, etc.) where the
perimeter requires several lengths of steel plate the "slip" part is
not really necessary.

But in power plant boiler work larger headers are rolled from a single
plate per section. For this work the "slip" part is an economic
necessity.

Very good friend of mine was pressure vessel engineer at one of my
employers and we used to kid him about his play with "tin cans".

These cans had wall thicknesses varying from 3" to 6"!

Serious fabrication work in anyone's book.

Wolfgang