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Blade wobble on table saw

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Forum topic by Cory posted 09-28-2009 04:58 PM 6566 views 0 times favorited 11 replies Add to Favorites Watch
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Cory

758 posts in 2883 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

rustfever

716 posts in 2774 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

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Cory

758 posts in 2883 days


#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.

-- The secret to getting ahead is getting started.

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rustfever

716 posts in 2774 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

RetiredCoastie

999 posts in 2647 days


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

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

-- www.thepatriotwoodworker.com Proud Supporter of Homes For Our Troops

View Rick  Dennington's profile

Rick Dennington

5177 posts in 2658 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.

-- At my age, an "all--nighter" is not having to get up and pee...!!!

View dbhost's profile

dbhost

5605 posts in 2696 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?

-- My workshop blog can be found at http://daves-workshop.blogspot.com

View khop's profile

khop

134 posts in 3140 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.
KHOP

-- How am I doing? Better than I deserve. Dave Ramsey

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 3763 days


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

Here’s fairly good wobble test procedure.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

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SKFrog16

661 posts in 2664 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

Cory

758 posts in 2883 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

chris1

2 posts in 2618 days


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

mandrel (english) == arbor (american)

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