Yes the ball is larger, 3/8. Have to stop answering thing when I should sleeping. The kit we have uses a shear pin to drive the ball. Hit the tool with the hammer and the pin breaks and the ball leaves the dent. Dennis -----Original Message----- From: David Beierl [mailto:dbeierl@gmail.com] On Behalf Of David Beierl Sent: Saturday, July 09, 2011 12:50 PM To: Dennis Haynes Cc: vanagon@GERRY.VANAGON.COM Subject: Re: [Friday] Bolts -- Rockwell hardness translate to grade? 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 |
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