Miter Saw Runout

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This topic contains 6 replies, has 4 voices, and was last updated by Avatar Matt Stern 8 years, 3 months ago.

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  • November 16, 2016 at 6:49 pm #2058
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    Matt Stern
    Participant

    Hello all:

    My 12″ compound miter saw was making rather rough cuts even with an 80 tooth blade, so I put a dial indicator to it. Near the circumference, about 1″ in (to avoid the deep cutouts), I found approximately 0.020 runout. To me, that sounds like a lot. I checked to see if anything was loose, but it was not – the runout is repeatable, meaning that the shaft is ever-so-slightly bent, or the big washer isn’t seating properly.

    Should I be concerned? Does anyone know what a “reasonable” limit should be? I do a lot of work with moulding and need accurate cuts.

    Thank you.

  • November 17, 2016 at 10:36 am #2059
    Joe Bottigliere
    Joe Bottigliere
    Participant

    I assume you tried other blades and checked the one you were using to eliminate that from the equation. I think you want to keep arbor runout under .010″. There is always some but a quality machine should be <.005″. If there is a visible bend in the arbor, it’s time to repair or replace.
    It could be that the blade is bent. Double check your measurements by marking the high spot on the blade then rotating the blade on the arbor slightly, retighten the nut then check again. The “high spot” would be at the same point on the blade. But you should check the arbor as well to see if that is the culprit.
    Check the washer and nut (and blade) for any burr that might have formed or gunk build-up that would throw it out of square.
    Ultimately, if the cut is no good, there is something wrong and you should be concerned.

  • November 17, 2016 at 11:05 am #2060
    Daryl Rosenblatt
    Daryl Rosenblatt
    Participant

    You didn’t say which saw it is. If it’s a simple as a blade problem, that’s great. If it’s the arbor, or something else, Ace Tool in Wantagh does great tool repairs; it’s in fact the mainstay of their business. Peter Profeta used to work there. If you are using it for a living, you might not want to take the chance and finding out the hard/dangerous way that the repair didn’t work.

    So far we have: 1. Bad blade, 2. Bent arbor. Any other suggestions out there?

  • November 17, 2016 at 12:26 pm #2061
    Daryl Rosenblatt
    Daryl Rosenblatt
    Participant

    I should have included this:

    Ace Tool Repair
    2201 Wantagh Ave.
    Wantagh.

    They also have a seemingly inexhaustible supply of router bits of all brands, Amana, Freud, CMT, you name it. Whenever I go there, there is a contractor picking up or dropping off a tool to be fixed.

    How else, or where else, do any of you go for tool repair?

  • November 17, 2016 at 7:18 pm #2062
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    Matt Stern
    Participant

    Thanks, Joe and Daryl. I have some homework to do!

  • November 17, 2016 at 11:34 pm #2063
    Michael Luciano
    Michael Luciano
    Participant

    Dewalt has a repair center on route 110 in Amityville. Not sure what brands, in addition to Dewalt and Porter Cable, they repair.

  • November 22, 2016 at 8:38 pm #2073
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    Matt Stern
    Participant

    Thanks, Mike, did not know that. Still need to do my homework, will hopefully get to it over the weekend.

    Happy Thanksgiving to all!

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