|Project by TheWoodenOyster||posted 09-09-2014 12:30 AM||2214 views||3 times favorited||10 comments|
I got an old iron powermatic 81 20” bandsaw back in February. As soon as I got it, I had to blaze through some projects but recently things have slowed down and I have had time to tinker with it and try to get the bugs out. One of the bugs was an incessant screaming on 3 or 4 second intervals. I thought it might be THE bearings, but I was glad to find out it was just the guide bearings. They were old and shot. To my surprise, they also had almost no horizontal adjustment. From what I know, most newer bandsaws have set screws that hold guide blocks that can be adjusted horizontally until they are just a hair away from the blade. Mine had nothing of the sort, so the bearings would not get as close to the blade as I wanted. Time for a custom job.
I am short on money, but not time right now, so I figured the best route would be to grab some scraps and make some wood guide blocks. I made them out of jatoba, the hardest , most porous thing on hand. I made a small thru mortise that accepts a bolt that holds it in place (see the pictures above). I read that it is good to make these self lubricating, so I boiled them in motor oil for an hour or two to impregnate them. Motor oil is my favorite new finish.
Installed them, adjusted them and they seem to be working great! The screaming is gone and I can adjust them to a few thousandths off of the blade!
Picture 1. The finished and installed blocks (front view)
Picture 2. The blocks before cooking
Picture 3. The old bearings
Picture 4. Deep Fried Jatoba
Picture 5. The finished and intalled blocks (rear view)
Picture 6. Lower set of blocks under the table
Comments and questions welcome!!!
-- The Wood Is Your Oyster