I just purchased a Freud 60 Tooth Table Saw blade and installed it on a Delta Contractors Saw. It cuts fine, however, if the saw runs for a moment before i start cutting, the blade is making a very high pitch sound. After i turn the saw off this "ringing" sound will continue. If i touch the blade the "ringing" stops, so i know it is the blade. Obviously the old delta blade did not do this. Is the blade defective? Thanks for your help.
What is the kerf of the blade? Which type of teeth? Have you replaced motors or changed the RPM in some other way?
Many blades "sing" and they seem to have two tunes: one is the screaming high pitch (which can actually hurt your ears) of a blade which is not true, i.e., out of round. The other is simply the tooth grind and gullet cutting through the air, and, in my opinion, has a rich tone which to a seasoned saw man sounds sweet indeed.
One simple solution could be stabilizers. They are relatively inexpensive and often work on thin kerf blades. Personally, I prefer .125 or better, although at this thickness they tend to be power hogs and must be kept in excellent shape and very sharp.
Have you put a mic to the blade? If not, I suggest you spend $40 or $50 to get a mic with a mag base (you'll thank yourself later). Grizzly has some inexpensive units.
Forrest makes great blades, But checkout Oldham. I have found them to be as good in quality and about 1/2 the price. Lots of others here also are having great results. I had the same kind of thing with a blade once and a Stablizer fixed the noise. You should almost always run a stablizer. Mine is a Forrest.
A dial indicator will tell if the blade has too much runout and should be returned to the manufacture. Also check the backing flange on your arbor. Make sure it is smooth and no stuck on bits or burrs.
I agree with all the things you've read on this thread. Use a dial indicator to check your blades. There are several brands out there that will do the job well. I also agree that Oldham blades are a great product at less than the cost of Forrest. I have both and I see no difference in the quality between them. You just have to keep in mind what you are doing with the blade and select the proper one for the job.
For future reference, I also use the Oldham blades.
I bought a stacked dado blade set first and found
it spectacular. I was sold. Forrest is also the
leader but Oldham is real close and a little less
in price. Good luck.
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