Miter saw not cutting cleanly.

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Forum topic by 3woodworkers4life posted 02-14-2016 11:58 PM 848 views 0 times favorited 4 replies Add to Favorites Watch
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61 posts in 2263 days

02-14-2016 11:58 PM

Topic tags/keywords: miter saw uneven cut rough cut

I have a Ridgid MS1290LZA sliding compound miter saw. It’s been working fine for the last few years – until yesterday. For some reason, it doesn’t make a smooth cut anymore. When pulled out all the way, it cuts fairly smooth. But, when it approaches the fence, the cut becomes messy and the sound of the cut changes. I’ve tried multiple blades with the same results, so I know that’s not the cause. The piece is also held tight against the fence (which is square to the blade).

Cutoff from left side of blade (I hope the marks are visible):

Piece from right side of blade:

Anyone know the cause of the problem and if it’s fixable?

Thank you for any info.

4 replies so far

View BurlyBob's profile


7695 posts in 3068 days

#1 posted 02-15-2016 12:07 AM

Could there be something building up or interfering with the slide arm? I bet your on the phone tomorrow with Tech services.

View distrbd's profile


2252 posts in 3249 days

#2 posted 02-15-2016 12:39 AM

Maybe the slides are getting a bit loose and need readjusting to get rid of the slop or the arbr is out of square to the blade for some reason.

-- Ken from Ontario, Canada

View Robert's profile


3788 posts in 2283 days

#3 posted 02-15-2016 02:54 PM

Slide could be it, but I would also check arbor bearings.

Remember when Aunt Bee bought the freezer what did Andy keep saying?

“Call the man!”

-- Everything is a prototype thats why its one of a kind!!

View 3woodworkers4life's profile


61 posts in 2263 days

#4 posted 02-15-2016 06:36 PM

Thanks for the input. After making another test cut on a scrap of 1×12, I noticed that the whole cut seems to be rough. Just to be sure, I double-checked every part of the slide. I even removed the front and back covers to find a good bit of sawdust behind them (hard to believe that much sawdust could sneak past those covers), but that had no affect. So, since that seems to have knocked out the likelihood of the slide causing the problem, I next moved to the arbor bearing.

After removing the arbor assembly, I spun the arbor by hand and noticed a clicking noise from the bearing. So, that makes me believe that the bearing is going out. Am I right in suspecting this? If so, I can order a new assembly and hopefully fix the problem.

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