On Sun, 21 Jul 2019 22:59:01 -0700 (PDT), whit3rd
wrote:

On Sunday, July 21, 2019 at 5:42:28 AM UTC-7, Jim Wilkins wrote:
http://en.sanouchuck.com/english/pro...p?id=45&type=5

Looks intriguing; the presumption, then, is that somewhere in the world
is a rolling mill turning out pentagonal bars? And mill vise jaws with
108 degree and 36 degree vees?

The pentagonal spud on a fire hydrant cap/valve is the only item I can easily
imagine this chuck holding.
Just like a 3 jaw it is also VERY good at holding cylendrical
objects - very commonly used in a lathe for "turning" - - - - -
Grips better than 3 jaws and distributes the clamping force for
hollow workpieces.