I recently bought a Freud LM74R Industrial rip blade and right out of
the package several of the teeth had burned marks from grinding. The
marks are on the edges and extend forward to the face. I know nothing
of metallurgy. Should I be concerned?
Is that a carbide blade???
I can honestly say that I have never seen burn marks from grinding.
Typically the teeth are under an oil bath when the grinding process is going
on. I have however seen dark spots where carbide teeth have been attached
to the saw blade.
That or something similar would be what I would surmise as well -- I
really doubt it is a "traditional" grinder overheat mark.
I don't think there's anything to be concerned over, but if you got it
locally, take it back or at least go compare it to some others in stock--
Freud is about as good as any at the price point -- after all, the blade
in question is the "industrial" line which iirc is the lower-cost,
designed for hard use rather than fine cabinetry end of the business,
I have. Over the years, I have ground a great deal of carbide, by hand and
by machine. It will discolor if you get it hot. Once cooled, it has no
effect on it. The discoloration is cosmetic only.
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