>>The part that counts is the radius at the point of string contact. > >Sure, but its the relative holding power of the friction between the >pin and the block, and its torque resistance as compared to the >actual torque developed by the string tension with a given size pin, >which will determine the pin holding ability. > >As Ron N wrote: > >> . . . With the moment arm of the string torque being the radius of >>pin diameter > >(plus the radius of the core wire) > >>and the block contact surface area varying with the circumference >>(pi*D), doesn't this >> proportion scale? > >Sure does! Hi gang, So far so good, until Ron O mentioned the wire diameter. That changes the ratio between the string leverage moment arm and pin circumference, and that doesn't scale. Given wire diameter, the torsional friction resistance to the string would increase with larger pin size. Smaller pins, less holding power. It's a small difference, and probably not of any practical concern, but there is a difference. Ron N
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