At 01:20 AM 7/9/2011, Dennis Haynes wrote:
>Brinell testing 60 pound ansi rails for automated storage-retrieval
>cranes. The 1/16" ball penetration test.

Rockwell and Brinell measurements differ in some fundamental
ways.  Rockwell measures the difference in penetration *depth*
between a 10 kGf preload and the working load of 60, 100 or 150
kGf.  The hardness number is read directly from the machine's scale. T

Brinell applies a calibrated force  - unless otherwise stated the
penetrator is a 10 mm (fat 3/8") ball and the force is 3,000 kGf -
and the *width* of the indentation is measured by examining it
through a microscope with a calibrated graticule.  The Brinell number
is obtained by formula or by use of a table supplied with the machine.

Yours,
David