Blade wobble on table saw

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Forum topic by Cory posted 09-28-2009 04:58 PM 7280 views 0 times favorited 11 replies Add to Favorites Watch
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760 posts in 3443 days

09-28-2009 04:58 PM

Topic tags/keywords: question craftsman 21829 blade wobble

I’ve got a Craftsman 21829 table saw and up until this weekend it had been great. No problems whatsoever. This weekend, the blade started to wobble pretty good, especially as it slowed down after a cut. I have checked everything that I know to check and can’t find anything wrong. I also swapped out my blade for another one and I’m getting the same problem.

Do you guys have any ideas on what to look for? Other than a new saw?

-- The secret to getting ahead is getting started.

11 replies so far

View rustfever's profile


752 posts in 3334 days

#1 posted 09-28-2009 05:06 PM

How are the bearings on the saw’s mandrel? Bad bearing could produce jut those results

-- Rustfever, Central California

View Cory's profile


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#2 posted 09-28-2009 05:08 PM

Um. Uh. I feel like I did in Algebra II when my teacher asked me a question I should have known the answer to but didn’t.

Not sure what the mandrel is or where the bearings are.

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752 posts in 3334 days

#3 posted 09-28-2009 05:26 PM

The mandrel is the shaft, upon which the saw blade is attached. There are bearings on the shaft to offer accurate and nearly frictionless revolution. The mandrel will most likely be driven from a seperate motor via a drive belt.

However, some saws may have the shaft as a an extention of the motor shaft.

You could also have warped a blade, possibly by getting it to hot. However, since two blades acted in the same manner, that probabply is not the cause of the wobble.

-- Rustfever, Central California

View RetiredCoastie's profile


999 posts in 3207 days

#4 posted 09-28-2009 05:44 PM

How much wobble are you seeing? What about a bad belt?

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Rick Dennington

5910 posts in 3218 days

#5 posted 09-28-2009 06:18 PM

Cory, I’m guessing that your saw is a belt drive. I would suggest that you check the pulleys to see if the set screw has worked loose. The pulleys need to be back on the shaft as far as they can go, and the shaft has a keyway that the setscrew tightens down on. If the pulleys are loose, this will cause the blade to wobble, and possibly throw the belt. I still have an old Craftsman 10” contractor saw I bought in 1986, and use it backed up to my UniSaw (outfeed table between the two) to use for dados and rabbits. Check the pulleys and setscrews. It’s gotta be something simple since it’s been running good in the past.

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View dbhost's profile


5723 posts in 3256 days

#6 posted 09-28-2009 06:20 PM

Mandrel is the wrong term. rustfever means arbor. It’s the shaft that the blade mounts on…

Now a couple of questions…

#1. Are all the mating surfaces clean and even. Dust and debris can get caught in the spacers, stiffeners etc.. and induce a wobble…

#2. with the saw OFF and double unplugged (unplugged from the wall, and the side mounted switch outlet, can you grasp the blade and wiggle it at all?

#3. from underneath the saw, are all of the motor mounting bolts tight?

#4. I am not entirely certain how to describe the layout, but if you look underneath the saw, you can see the motor is connected to the arbor assembly via 2 multi ribbed belts. Is the Arbor Assembly mounted to its mount tightly?

Being as it is a 21829, is it still under warranty?

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View khop's profile


134 posts in 3700 days

#7 posted 09-28-2009 06:28 PM

Cory, I had a craftsman ts many years ago and I had trouble with the set screws coming loose on the pulleys.

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Dick, & Barb Cain

8693 posts in 4323 days

#8 posted 09-28-2009 06:36 PM

Here’s fairly good wobble test procedure.

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View davidpettinger's profile


661 posts in 3224 days

#9 posted 09-28-2009 08:59 PM

On some sears saws they have a retainer ring that holds the backside of the second arbor bearing in place. Sears machines have a set of spring washers behind this bearing. If the pulley has come loose, make sure that the retainer ring did not come loose as the decrease in tension on the washers will cause the blade to wobble. Locktite blue on the screw threads cures the problem, also on the set screw for the pulley.

-- Methods are many,Principles are few.Methods change often,Principles never do.

View Cory's profile


760 posts in 3443 days

#10 posted 09-29-2009 03:31 AM

Thanks for all the help guys. A combination of cleaning the arbor, the arbor nuts, and making sure all bolt s were tightened eliminated the problem altogether.

-- The secret to getting ahead is getting started.

View chris1's profile


2 posts in 3178 days

#11 posted 10-06-2009 10:18 PM

mandrel (english) == arbor (american)

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