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Table saw blade coming loose8/10
I have a sliding table saw that the nut to keep the blade on has loosened enough that the blade starts wobbling.
Nothing has changed besides switching to a sawblade that we have used before.
Any thoughts why it should be coming loose?
Is the nut side blade stabilizing washer in place?
The retaining nut depends on surface friction to keep it tight against the washer and blade. Any remaining lubricants from the saw sharpening service may be the culprit.
Strip-able shipping coatings are "oily" as well as grinding lubricants. Did you order any non-stick saw blade coating like "Perma-shield"? This stuff is specially designed to eliminate or greatly reduce friction (which is very good, but not at the hub).
Clean everything up with solvent, paying close attention to the threads of the nut and shaft. Be sure they are clean and undamaged. The nut should remain tight without having to physically "torque it down".
BTW, a saw motor wired wrong and running backwards, will positively spin the nut off in a hot second (no matter how hard it's tightened on the shaft).
Now how ya spose I know that?
As vibration can cause loosening, perhaps you also have a bearing that is starting to have too much "play."
Note that the washer used directly in contact with the nut often has an outside and inside. This dished washer, or similar design feature, helps create tension when the nut is tight to prevent loosening. So, maybe the washer is reversed?
If your saw has a brake, which is stopping the arbor too fast, the inertia from the blade could be the culprit.
Thank you for the inertia comment. That helped resolve one of my own issues