I have a Jet 14" band saw and it's a workhorse. I've had it about 8 years or so now and this is really the first problem I've had with it. Before now all I've had to do was replace the starter switch and that was within the first six months I had it, so I can say I've gotten my money's worth out of the saw. Today the motor belt came off the pulley. I know how to fix it but I'm curious as to how it happened.
I was re-sawing a piece of walnut and there was a huge bang and the machine stopped. The belt does not look damaged at all, there are no cracks or even frayed edges on the belt. Any idea why the belt came off the pulley? If the belt only comes off once every 8 years that's not bad-- but if I can find out why it came off this time - perhaps I can prevent it from happening again. Is this just something that happens for no particular reason or is there something I need to check?
Like the guys said / check if pulleys are loose (may have climbed over) or may be
not in line -use straight edge (tighten with grubscrew or may need to replace)
Check if belt is worn on the inside - may also be a reason for climbing/jumping out under stress
Check if belt tight enough - sheck like on car - some 6mm play when you pinch it in the middle
- if it's too loose, you'll hear it, if it's too tight, the motor may get hot and bearings wear out.
-My first thought was actually that something (piece of wood) came under the belt and it
climbed out - like the guys said
Just my luck some honey boo boo wanna be highjacks my thread! Jeez-there's no escaping low morals.
Back to the issue at hand. I think you are right that a piece of wood probably got between the belt. The pulleys are in alignment and the belt is in good shape. I simply loosened the mounting bolts a bit, slipped the belt back on and retightened the bolts, checked my alignment again and plugged it in. IT WORKS!
I do think if this happens again, I'll change to the link belts. I did take the opportunity to check the full belt inside and out and it's in remarkable shape for being so old. It's not even got any "rotten" spots. Lucky me.
I recently put a link belt on my old Craftsman table saw and my God what a difference!! Runs way way smoother with the link belt. So, I picked up a couple more for my old 10 Atlas TS, which uses 2 belts. I bought the belts at Harbor Freight for $24.99 ea. (five footers) and can not attest to the longevity, just the smoother performance. As far as adjustment after wearing in time, a link can be added or removed in just a couple of minutes.
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