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Recommendation? hardness testing equipment

R

Rick Graves

Joined
May 22, 2018
Messages
1
We want to harden the blade edge (only), and this may be feasible because the blades are round (as you would find on a meat slicer).

People I am working with believe it is not possible to test the hardness of the edge, as it is too narrow.

What equipment would be suitable to test the hardness at the edge?

Thanks,
 
You may not be able to test right at the edge. But with a small taper on a round knife you could probably get close.

You want a Rockwell C scale tester, and there are quite a few out there, just do a google search. Or go to a machine shop nearby, they might have one.
 
you can test the hardness of a thin piece, but not really practical in testing a knife edge as it is too hard (brittle) and the penetrator will cause the edge to chip out and fracture or break off.

So if the edge was soft enough, you could test it, but then you wouldn't have a very practical knife
 
Make a second test sample of thin metal from the same stock as the blade. HT it along with the blade. Test it for hardness. It should be very close to the edge hardness. For your test, I would use a 1"X2" coupon .060" thick and sand it smooth and clean to 400 grit before testing.
 
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