Re: Tablesaw arbor nut comes loose
I doubt you will find self-locking nuts of the correct threads per inch to fit the arbor. Most self-locking nuts are fine thread, and also have a maximum number of "re-uses" before they no longer lock (depending on the criticality of the part, for aircraft some are allowed only the initial use, and most are allowed only 3 re-uses, and that is with a torque limiting wrench to tighten them). They do make a locking nut that has the actual metal peened in on the back side, but that style will tear up the arbor shaft.
As for a second nut (jam nut), if the inner nut moves outward during the "locking" tighening of the jam nut, the blade will be loose.
If you think something may be dragging down the arbor/motor causing the blade inertia to be the culprit, you may want to blow out the motor with compressed air. Could be saw dust buildup causing the drag, which also is probably causing a lot of friction heat in the motor. I don't think its the ZCI, as that would still be putting tightening torque on the blade just like cutting a piece of wood.
JMTCW
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