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Tablesaw blade intermitent vibration. Any thoughts?

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Forum topic by Cam posted 01-30-2012 05:30 AM 1332 views 0 times favorited 6 replies Add to Favorites Watch
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Cam

20 posts in 2029 days


01-30-2012 05:30 AM

Topic tags/keywords: tablesaw forrest blade vibration question

I have a contractors tablesaw with a newly installed Forrest woodworker 2 blade. I haven’t used it much, but when cutting any material, from hardwood to ply, the blade will vibrate for roughly 1 second every 3 to 10 seconds. When it vibrates, the blade spreads about a 1/64 up to a 1/32, widening the kerf.. I’ve never had this problem before. Would a blad stabilizer take care of this? Anyone ever dealt with this?


6 replies so far

View bugz's profile

bugz

773 posts in 1315 days


#1 posted 01-30-2012 05:56 AM

If it is full 1/8” kerf, that is what I run, I would check fit on shaft, runout on trunion bearings, clean washers. I can stand a nickle on edge while saw is running, mine is also a contractor saw. also check belt for flat spots. I have 2 of those blades and both run super and cut great. If your old ran true, I guess it could be blade. Good luck.

-- Bob, Lewistown, Montana. Kindness is the Language the blind can see and deaf can hear. - Mark Twain

View ajosephg's profile

ajosephg

1852 posts in 2212 days


#2 posted 01-30-2012 12:16 PM

Does it only do it with the new Forrest blade? If so, that’s your problem.

If it does it with all your blades, it sounds like you have two different vibrations with slightly different frequencies. That causes a beat frequency with a period as you described. Since the only two things that rotate are the motor and arbor, I’d look there. Things like bearings, pulleys, shaft run out and belt.

I also have a contractor saw that had a similar problem (not as bad as your’s, because mine didn’t affect the cut), but I solved it by changing to a link belt. It now passes the nickle test.

-- Joe

View knotscott's profile

knotscott

5453 posts in 2027 days


#3 posted 01-30-2012 03:38 PM

Has the blade always done this? If it’s new, and does it only with this blade, I’d send it back.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View Bill White's profile

Bill White

3447 posts in 2612 days


#4 posted 01-30-2012 04:54 PM

You are seeing the results of harmonics being set up in/on the saw. Try another blade with different tooth configuration. If it repeats on another blade, ya might want to start looking at bearings as well.
Bill

-- bill@magraphics.us

View BobM001's profile

BobM001

388 posts in 982 days


#5 posted 01-30-2012 05:23 PM

If you can get your hands on a dial indicator and a magnetic base check that blade for wobble at the highest point on its diameter you can. Also check your motor/arbor sheave alignment. If you detect any vibration or harmonics just running a bare arbor there are issues other than the blade.

Bob

-- OK, who's the wise guy that shrunk the plywood?

View jeter's profile

jeter

20 posts in 1239 days


#6 posted 01-30-2012 07:01 PM

I had the same saw for many years and used Forrest ww II blades on my saw too. I had a similar problem and I found it to be that the pulleys were slightly off and loose. The belt might be too tight as well. There are two screws with two bars where the motor hangs. Loosen the two screws and push in about ¼” or 3/8” of an inches in and retighten. Check the pulley as well.

Jeter

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