Hi,
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?

TIA
John

"JohnB" wrote in message
oups.com...
Hi,
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?

TIA
John


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.

Leon wrote:
"JohnB" wrote in message
oups.com...
Hi,
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?

TIA
John


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--

--

"dpb" wrote in message ...
Leon wrote:


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--


Or, get your money back and look into buying a brand that puts a bit more
care into the manufacturing of their blades.

No.

"JohnB" wrote in message
oups.com...
Hi,
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?

TIA
John

Leon wrote:
"dpb" wrote in message ...
Leon wrote:

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--


Or, get your money back and look into buying a brand that puts a bit more
care into the manufacturing of their blades.

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,
isn't it?

--

"dpb" wrote in message ...
Leon wrote:
"dpb" wrote in message ...
Leon wrote:

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--


Or, get your money back and look into buying a brand that puts a bit more
care into the manufacturing of their blades.

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,
isn't it?

You may have a point there. He probably just needs to buy a better blade.

"CW" wrote in message
link.net...
No.


Even with DSL I thought you reply would never finish down loading. ;~)

On Jun 8, 1:05 pm, "Leon" wrote:
"JohnB" wrote in message

oups.com...

Hi,
I recently bought a Freud LM74R Industrial rip blade and right out of
the package several of theteethhadburnedmarks from grinding. The
marks are on the edges and extend forward to the face. I know nothing
of metallurgy. Should I be concerned?

TIA
John

Is that a carbide blade???

I can honestly say that I have never seen burn marks from grinding.
Typically theteethare under an oil bath when the grinding process is going
on. I have however seen dark spots where carbideteethhave been attached
to the saw blade.

Yes it is a carbide blade. The discoloration, bluish in color, is
visible on three teeth out of thirty and is not on the brazing but on
the side of these carbide teeth and across the face of one.

"JohnB" wrote in message
oups.com...
On Jun 8, 1:05 pm, "Leon" wrote:
"

Yes it is a carbide blade. The discoloration, bluish in color, is
visible on three teeth out of thirty and is not on the brazing but on
the side of these carbide teeth and across the face of one.


New to me, usually a discoloration in the metal color like that means the
hardness has been compromised. I would be leery, I have never seen carbide
to that.

"Leon" wrote in message
t...

"CW" wrote in message
link.net...
No.


Even with DSL I thought you reply would never finish down loading. ;~)

"Leon" wrote in message
. ..

"JohnB" wrote in message
oups.com...
On Jun 8, 1:05 pm, "Leon" wrote:
"

Yes it is a carbide blade. The discoloration, bluish in color, is
visible on three teeth out of thirty and is not on the brazing but on
the side of these carbide teeth and across the face of one.


New to me, usually a discoloration in the metal color like that means the
hardness has been compromised. I would be leery, I have never seen
carbide
to that.



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.

"CW" wrote in message
ink.net...



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.




Thank you for clarifying. I'll know better next time.

Had the same problem when I replaced the bristles on electric toothbrush
with stainless ones, burned teeth that is ...



"Leon" wrote in message
. net...

"JohnB" wrote in message
oups.com...
Hi,
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?

TIA
John


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.