Why the saw can run but there is no cutting strength

This is what AI has to say using a simple search: A 12A AC motor lacking power can be caused by electrical issues like low voltage, open windings, or a bad capacitor, as well as mechanical problems such as worn bearings, overload, or a lack of lubrication. To diagnose the issue, check the power supply, test the windings and capacitor, and inspect the bearings for proper lubrication and free movement. I would start with a capacitor if it has one.