I was using my large Jet bandsaw cutting a 1" board and suddenly it made a noise and the bandsaw blade came off. It didn't break and It came off toward the front. I immediately shut down(after the bang noise) I loosened the tension, opened it all up. I could not see any sawdust build up or anything that may have gotten under the blade and caused it to move.

I reinstalled it and after checked all bearings and guides. None seemed much out of adjustment. I reset tension and turned on. Everything ran smooth and it resumed cotting just fine. 

What do you think happened? Maybe a piece fell in between the wheel and belt? I was not cutting anything small.

Edited August 14, 20205 yr by Ron Altier

This may help, I forgot to attach

What type of tires are you using Ron?

I've read accounts of urethane tires throwing a blade for no apparent reason.

hmmmm I have a Ryobi 9 inch bandsaw and I've NEVER had a problem with it yet, haven't even yet had to replace the blade.

I'm using the original tires, which I inspected, and they looked good. They didn't have much sawdust accumulation. I bought it used from a guy that didn't know how to set it up and gave up. He paid $550, I paid $150. After setting it up properly,per instructions, it has been perfect.

 Are the tires suppose to be stretch fit or glued on?

1 minute ago, Ron Altier said:

 Are the tires suppose to be stretch fit or glued on?

I've seen them done both ways. The vendor that I got my rubber tires from recommends gluing them on.

If it does not happen again I would suspect a wood chips got behind blade.  I have same saw and it happened awhile back.  Reset it and it has been fine.

If they are urethane they are stretch fit and the bigger the bandsaw the harder and tighter they fit. I have to use crow bars , tire tools and lots of elbow grease to get them on ...I have an old sears band saw with rubber belts and yes they do need glue. And the 10" I haven't had it long enough to worry with it yet.

I just put a new pair of urethane tires on.  If you let them sit about 10:minutes in hot tap water with a few drops of dish soap they’ll pull right on.

If you do not have brushes on your saw here is my solution.   Used a fingernail brush from the Dollar Store.  

 

 

 

 

 

 

 

 

Now that’s a great idea!

Every time my blade jumps the track it's because I tried to back up or twisted it too much.

 

Or it hates me.   Pays your money = takes your chances

 Today I was using the saw again and the blade came off again. This time I shut the job down, removed the blade and tires. The top tire was fine, that is the one I looked at last time and finished my cut after putting the blade back on. This time I found the bottom tire way off to one side. Close inspection showed a hard gummy substance on one side of the tire. It was slightly red. Then it dawned on me. I had cut a dog bone for my wife and it had red gummy stuff on the inside. I didn't see it until had cut into it. It took a lot to get it off and I cleaned up everything. After reassembly, I can see that it is time to replace the tires. Its all my fault for not closely inspecting that bone. I almost always do, but this time I didn't. Oh well Its probably time to replace the tires anyway. 

 When the new tires and blade comes in, it will be tare down time for full inspection and alignment. Should have done it the last time. As usual, I wanted the easy way out and to finish the job.

Edited August 18, 20205 yr by Ron Altier

Ron what size band saw is it?

9 minutes ago, Smallpatch said:

Ron what size band saw is it?

14"

I'm pretty sure I now know what happened. When I cut that dog bone, the gummy treat inside (that I didn't see) accumulated on one side of the tire. This caused it to track to one side and go out of alignment. It also cause the tire to stretch with further use. It was all my fault for not fully inspecting the saw blade and tracking.

 

 

Thanks for sharing the info Ron.  Not that I cut dog treats - but I have been known to take a quick inspection and run rather that a good look see.

Now, you have me curious.  Is it possible that you can use either a dremel or an oscillating saw to cut bones next time?  You could reuse the blade and not mess up the saws.  Just a thought.  I don't cut bones, but just wondering.