Ensure the blade is not running before adjusting your table saw. As making adjustments could cause hands to get near to the blade. Even a slow-moving blade is full of sharp edges which could cause harm. 2. Ensure that the blade is turning clearly before turning the power on. This is especially important when you have made adjustments or changes related to the blade. Also, you should spin the blade in a non-powerful manner at least once or twice to ensure there aren't any scraps or objects touching the blade.