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Mitre Saw wobble

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Forum topic by Dansaw posted 03-25-2015 10:26 AM 1148 views 0 times favorited 22 replies Add to Favorites Watch
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Dansaw

15 posts in 708 days


03-25-2015 10:26 AM

Hi all,
I am new to the forum and will post details about my shop with pics, but need some advice. I have had a Craftsman 12” compound Mitre for 10+ years and it has served me well. It has developed a severe wobble and won’t cut straight any more. Should I bother fixing? I really don’t want to spend any more on my shop at this point but will if I have to. The two large washers that clamp the blade were slightly marred but have been filed and sanded down. The bold is tight and the blade is secure. The weird thing is it doesn’t feel like a bearing. It does it with two different blades…. your input is appreciated.
Model # 137.212150
3 HP
400 RPM
12” laser


22 replies so far

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HornedWoodwork

222 posts in 675 days


#1 posted 03-25-2015 02:37 PM

It might be the post. If that is even slightly bent it can wobble the blade noticeably. On a chop saw a bent post is not that uncommon and can be fixed, but that’s major surgery. It might not be worth replacing.

-- Talent, brilliance, and humility are my virtues.

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Dansaw

15 posts in 708 days


#2 posted 03-25-2015 04:14 PM

It has a very minor amount of play if you grab the blade but it has a sever wobble to it when running. I know it isn’t top of the line and that is why I am hesitating on fixing. I am in the process of building a TS Crosscut sled but that doesn’t work for long pieces. Will the post surgery require specialized tools or just lots of man hours?

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devann

2200 posts in 2153 days


#3 posted 03-25-2015 06:18 PM

I had the same occur on a miter saw I have. I replaced the factory supplied washers and that fixed the problem.

-- Darrell, making more sawdust than I know what to do with

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Dansaw

15 posts in 708 days


#4 posted 03-25-2015 06:42 PM



I had the same occur on a miter saw I have. I replaced the factory supplied washers and that fixed the problem.

- devann


Did you replace with more factory washers? Are there alternatives that work
?

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devann

2200 posts in 2153 days


#5 posted 03-26-2015 04:43 AM

Yes, I used factory replacement parts. You might look around for a similar model. Seeing how you have a Caftsman, a similar model could be made by ether Skil or Black & Decker. It would depend on how old your saw is. Post a picture of your saw, it may help ID.

-- Darrell, making more sawdust than I know what to do with

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MrRon

3926 posts in 2704 days


#6 posted 03-26-2015 07:05 PM

I would bet that when you filed and sanded the washers down, you lost the parallelism. Get new washers. The ones from Sears may not be parallel. Any of the saw manufacturers washers can be used; Dewalt, Bosch, etc.

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Ghidrah

667 posts in 682 days


#7 posted 03-26-2015 08:03 PM

Were the washers filed down before or after the wobble began?
If after did the wobble worsen?
You don’t mention the saw making noise when running or is a slider.
So the MB begins vibrating as soon as you press the trigger and continues till the blade stops?
You’ve checked the blade in a fixed position to ensure it is 90° to the table?
The wobble creates a kerf in the wood wider than the offset between teeth and blade?

In my experience, (tools and vehicles) a bearing pretty much always begins making noise before it exhibits wobble damage. Most always make noise after they warm up from use. If the saw is a slider I’d be looking at the slides, when my Bosch 3915 began cutting rough it turned out to be the slides linear bearings. They didn’t make noise, I suspected the pivot bracket. Sometime in the past I had spilled paint on a slider tube, I wiped off what I saw but there must have been residual that maybe got into the bearing. I still have the saw but only use it for rough framing.

-- I meant to do that!

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Dansaw

15 posts in 708 days


#8 posted 03-26-2015 09:40 PM

First of all Thanks for helping to all.
Saw is >13 years old
Noise is not much different than it has been entire life but I am hard of hearing so…
Kerf is wider than teeth. See picture of a really good cut I just made with it.
Saw starts, runs a little, wobbles a lot and seems to settle, but when I go to cut it wobbles again. I tried to take video but found it dangerous with the cover off and one handed.
Pictures coming but need to figure out how to load

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Dansaw

15 posts in 708 days


#9 posted 03-26-2015 09:55 PM

I hope this works.

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Dansaw

15 posts in 708 days


#10 posted 03-26-2015 09:56 PM

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bigblockyeti

3665 posts in 1181 days


#11 posted 03-26-2015 10:58 PM

I have washers similar to those on my RIDGID miter saw and I had a severe bind cutting discs from a branch for a project. The blade stopped almost immediately and there was a wobble afterwards. A new pair of washers fixed the problem and haven’t had an issue since. If you’re able, you might want to put a dial indicator on the spindle to see if it has any runout, as mentioned previously even a little can be significantly amplified at the cutting edge.

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devann

2200 posts in 2153 days


#12 posted 03-27-2015 02:51 AM

Besides replacing the washers you’ll probably have to also replace the blade too. If the washers suffered damage it came about through the blade, probably a sudden stop?

-- Darrell, making more sawdust than I know what to do with

View Ghidrah's profile

Ghidrah

667 posts in 682 days


#13 posted 03-27-2015 04:05 AM

That is something to look into run a reliable straight edge over the side of the blade and rotate to see if it is bent. Like an unbalanced tire it wobbles at certain rpms then sometimes clears up at higher rpms. The washer looks like it took a hell of a torqueing to cause a deformation like that.

Did you let somebody use the saw recently?

The bevel hub locking solid and unmovable with an unpowered saw?

-- I meant to do that!

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MrRon

3926 posts in 2704 days


#14 posted 03-27-2015 03:06 PM

Besides the washers, the blade appears to be the wrong one for a slider. You are using a rip blade (28 teeth) which probably has a 5° positive rake. That could contribute to a wobble. You should use a x-cut blade with a negative rake.

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bigblockyeti

3665 posts in 1181 days


#15 posted 03-27-2015 03:22 PM

That doesn’t look like a slider to me?

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