Chris
Well-Known Member
Many may recall that hardness testers were not commercially available in 1973 (and some of you guys weren't born yet), there no PC's with spreadsheets, and I don't think XRF guns were available.
Sorry the text is a cut off on the right, having scanner issues I can't quickly resolve. However you can readily interpret the last word in each line.
I built one of these years ago, still have it. Essentially it tests hardness (but does not read in BHN) by relative penetration. It allows you to blend alloys of varying hardness/toughness to arrive at an alloy of desired BHN. Today we have spreadsheets that can do this better, but they assume that we know the base alloy.
This thing still has value in determining relative hardness of various ingots/batches. And it's cheap.
Sorry the text is a cut off on the right, having scanner issues I can't quickly resolve. However you can readily interpret the last word in each line.
I built one of these years ago, still have it. Essentially it tests hardness (but does not read in BHN) by relative penetration. It allows you to blend alloys of varying hardness/toughness to arrive at an alloy of desired BHN. Today we have spreadsheets that can do this better, but they assume that we know the base alloy.
This thing still has value in determining relative hardness of various ingots/batches. And it's cheap.