I have to laugh, when I changed my blade a couple of days ago, I found the same thing. I always keep an extra bearing on hand, have to order a new one now. I do a lot of resawing and they don't last long. Why don't they???
In my opinion they are using the bearing wrong or the wrong bearing. If the bearing was turned 90 degrees so it spun like a bearing is supposed to spin ,they would probably last forever. Here you have a blade pulling down on the side edge of the bearing on top turning the bearing that rubs on the bottom of the bearing causing friction heat and eventually freezing up the bearing and filing a groove from top to bottom. This bearing does not guide the blade only keeps it from being pushed back ,the guides are on the side.
Thats my opinion and I am sticking with it.
Last edited by Herb Stoops; 11-22-2014 at 02:00 PM.