Band Saw
I picked up a 10" (3 wheel) band saw from a guy on Craigslist. He definitely used it because there was saw dust in it, but I don't think he knew how to set it up. The lower blade guide was not even close and based on the sawdust and stiffness of the screws, I don't think he ever moved it. This let the blade flex backward too much and put undue pressure of the top wheel. The 2 driven wheels have bronze bearings pressed into the plastic wheel hub and ride on a hardened shaft. I think the flexing caused the wheel to slip partially off the bearing.
I pressed the bearing out and found that it is flanged on one side. I decided to make a collar that would retain it. I chucked the wheel in the lathe and faced off the extended portion of hub on one side. I then turned and bored a simple aluminum collar. It took a moderate amount of finger pressure to slip it on the bearing. I set the collar on end in the mill vise and drilled a hole for a 10-32 set screw. Before tapping the hole, I put the bearing in the hub and the collar on the bearing. I used a transfer punch to scribe to center of the set screw hole on the bearing. I drilled a dimple for the set screw in the bearing and tapped the screw hole. I assembled everything and the saw works great. The bottom wheel has the same bearing configuration. It seems fine now, but I can do the same thing to fix it if it develops the same problem.
Click the pictures for larger images.
I pressed the bearing out and found that it is flanged on one side. I decided to make a collar that would retain it. I chucked the wheel in the lathe and faced off the extended portion of hub on one side. I then turned and bored a simple aluminum collar. It took a moderate amount of finger pressure to slip it on the bearing. I set the collar on end in the mill vise and drilled a hole for a 10-32 set screw. Before tapping the hole, I put the bearing in the hub and the collar on the bearing. I used a transfer punch to scribe to center of the set screw hole on the bearing. I drilled a dimple for the set screw in the bearing and tapped the screw hole. I assembled everything and the saw works great. The bottom wheel has the same bearing configuration. It seems fine now, but I can do the same thing to fix it if it develops the same problem.
Click the pictures for larger images.