I am attempting to resaw 8″ cherry on a jet 14″ bandsaw with a riser block. I am using a 3 tooth/in skip tooth carbide blade and have tried various tensions up to 15000 psi. The problem is when I feed the stock the blade chatters and jumps violently. I have checked the clearances on the guides on top and bottom and just can’t figure out what the problem is.
Any ideas?
Replies
It is very hard to diagnose machine problems at a distance, but here are a few lesser known possible causes for your problem:
1. A bad blade. Look for a kink, a crack, or a bad weld, or on a carbide blade, a missing tooth. The best way to check for blade problems is to inspect the blade off the machine first and then to hand rotate it when it is on the machine to see how it acts going through the guides.
2. A curl of wood, that is being pushed aside instead of being cleanly sheared off, is piling up under the stock lifting the board off the table which will cause grabbing as the poorly supported board wobbles. This is a bit more common with carbide blades.
3. You have a drive problem, such as a loose or badly worn belt that alternately slips and grabs when a load is placed on it. A loose pulley or lower band saw wheel that has lost or sheared its drive keys would also cause this problem. A bad tire that slips on the rim of the wheel or has become hard with age can also cause the problems you describe.
John White
Edited 9/25/2006 10:58 am ET by JohnWW
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