"xpzzzz" wrote in message ...
On Wed, 27 Jul 2011 22:14:46 -0400, Machinist60 wrote:

Do I have it right that the transition from a jamming taper to self
releasing is close to 7 degrees (included) for steel?


Jamming needs the tangent of the half-angle to be less than the
coefficient of friction; steel-steel is about .15, giving about 10
degrees.

Thanks, you confirmed I had it close.

John.