(12-31-2017, 05:33 PM)grepper Wrote: Mr. Me2 – Because I sharpen on a Kally, I found a statement you made in post #31 of this thread interesting. You stated, “I have seen microhardness tests that show softening during power sharpening of about 5 points.”
What are “points”? Are you speaking or Rockwell C?
Can you point me to those studies?
Sorry, I reread my follow-up and meant to answer more directly. Yes, the drop was ~ 5 points in HRc. I have finally been able to get the link to the information, which is below. The hardness was actually measured in Vickers hardness, which is then converted. The original hardness is 59 to 60 HRc. The overheated hardness dropped to about 55, but only in the last 0.003 to 0.004 inches at the edge. There are some concerns regarding the test, but the information is not available to check the concerns. This includes things like belt speed, pressure, etc.
https://lh3.googleusercontent.com/-fcf1c...Shears.png