350 steel machine - grinding wheel vibrates too much

Reason: A. The lower pressure plate is too dirty or has foreign matter; B. The grinding wheel is not well balanced.

Correction: Clean the dirt, use a well-balanced grinding wheel, and swap the upper and lower pressure plates. Loosen the pressure plate screw (appropriately), turn the grinding wheel by hand to a certain angle, and then tighten the pressure plate screw (can be multiple times) to get the best result.