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Thread: Tablesaw arbor nut comes loose and I know why

  1. #1
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    Tablesaw arbor nut comes loose and I know why

    I have a PM 66 Tablesaw with a zero clearance insert. One of the ones you buy premade. Occassionally now, the arbor nut will come loose when I turn the saw off. The first couple of times I thought maybe I didn't tighten the nut properly, but just this past time it did it and I know I tightened it. Any thoughts or suggestions as to why this is happening?
    Last edited by Travis Porter; 02-11-2007 at 03:38 AM.

  2. #2
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    This one is tough... I was taught to NOT tighten the arbor nut, but just make it finger tight, and let the saw tighten it as it cuts.

    European saws are required to have dynamic (electronic) braking to slow the saw blade faster (not the "instant" stop of SawStop), but those blades have three rather than one hole, so it doesn't loosen the nut.

    Could there be some degree of braking provided by the motor, that may be set too aggressively for a "one hole" blade? I believe the European saw motors have an adjustment for the degree of braking.
    Charlie Plesums, Austin Texas
    (Retired early to become a custom furnituremaker)
    Lots of my free advice at www.solowoodworker.com

  3. #3
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    Does the nut come loose using the standard insert? If not, maybe you have some friction with the zero clearance one during braking?

    Are you sure your arbor shaft, face plates, washer are completely clean and free of sawdust when you put the blade on. Might not be getting a firm tightening of the nut due to sawdust causing the alighnment of the blade to not be straight.

    Just some thoughts.

  4. #4
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    my thoughs are in line with charlie here....when the brake kicks in it`s probably causing the nut to back off.....tod
    [SIZE="1"] associated with several importers and manufacturers.[/SIZE]

  5. #5
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    My Thoughts, the nut in reality is more or less joined to the blade by the washer on the nut side of the blade by friction. The Washer is joined to the blade my friction, To me the blade is slipping on the inside washer when the brake is applied, thus turning the nut and loosing it on the threads. So the Inside Washer thing must be turning on the shaft.
    Drawknife, Spokeshave, Plane, Rasp; Decisions, decisions.
    Old tools are all very MODERN, they are all CORDLESS.
    By Hammer and Hand All Arts Do Stand.

  6. #6
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    I don't believe the saw has a brake. I am going to try to clean the arbor, arbor washers up and rought the washers up a bit and see what happens. The point that the blade is slipping on the inside washer does makes some sense to me.

  7. #7
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    The inside and outside Washer Things are Stabilizers to give support to the blade and also to keep the Blade running true and also to give more area for friction driving the blade. It could be not tight enough fit to driving shaft, it could be vibration caused from V belt memory if its belt drive, or out of balance blade. Try some pipe dope on threads of arbor to help keep nut from unscrewing. Or a little nail polish as some location where nut and arbor threads meet after tighnening nut, let it dry before use. Force of unscrewing will easily break the nail polish, its kind of like an external lock tight.
    Roughing up the washer will not do much just clean blade and washer well with a good solvent, such as denatured alchohol or paint thinner.

    If its belt drive and vibration is the culprit just replace belt with a sectional V belt as it will not develope a memory, Most woodworking tools can be greatly improved by this method as when a V belt sets for any lenght of time it develops a memory where it goes around pullys which when running turns into vibration.
    Last edited by Jr Strasil; 01-02-2007 at 03:05 PM.
    Drawknife, Spokeshave, Plane, Rasp; Decisions, decisions.
    Old tools are all very MODERN, they are all CORDLESS.
    By Hammer and Hand All Arts Do Stand.

  8. #8
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    If the culprit is the inside flange washer slipping on the arbor, just get a thin internal lock washer and slip on first. its a round washer smooth on the outside with little serrations on the inside.
    Drawknife, Spokeshave, Plane, Rasp; Decisions, decisions.
    Old tools are all very MODERN, they are all CORDLESS.
    By Hammer and Hand All Arts Do Stand.

  9. #9
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    Location
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    Like this, should be available at hdwe, farm and automotive stores.
    Drawknife, Spokeshave, Plane, Rasp; Decisions, decisions.
    Old tools are all very MODERN, they are all CORDLESS.
    By Hammer and Hand All Arts Do Stand.

  10. #10
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    Dec 2006
    Location
    Wake Forest, NC
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    Well I have pulled the motor cover off and blew out the motor real good with an air hose. Additionally, I pulled out the dial indicator and I have less than .001 of runout on the arbor. The threads on the arbor look good and both flanges of the washers or whatever you call them are clean, no play whatsoever. I got out the blade cleaner and cleaned the blade since I had it off as well. One thing I did notice is that it seems the belts have gotten a "memory" where they want to sit in one spot. I am going to contact Powermatic tech support to see what they say.

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