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Bandsaw motor trouble
http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=5770		 Page 1 of 1
Author:  Todd Rose [ Wed Mar 22, 2006 4:31 am ]
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My bandsaw motor is suddenly making a lot of noise. It's a Jet 14" bandsaw, only a couple years old. It's got a 1 HP motor, and I have it wired for 220v. All of sudden yesterday it started making this fairly loud, kind of rattly-grindy sound. It starts the moment I turn it on, is constant while running, and then instantly stops when I hit the off button, even though the motor takes a while to spin down and come to a stop. My first thought was a bearing gone bad, but I would think a bearing would continue to make noise after the power is cut but the thing is still spinning.

I know it's the motor, because it makes no difference disconnecting the belt from the motor pulley. I've checked all the motor mounting bolts and every little screw on the motor, everything I can see and check - nothing is loose.

There is not significant vibration, just noise. But it's a pretty nasty noise. Any ideas?

Thanks!
Author:  tippie53 [ Wed Mar 22, 2006 4:38 am ]
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Check the pulley and see that the key didn't move . If that moves and is rubbing it can make a horrid noise.
You don't say if the motor has lost any power . THe pulley will be set to the shaft on a keyed slot and set screw as I am sure you are aware of.
   Hope that is all that is wrong. If that isn't it check the motor itself for loose screws and see if there is play in the shaft
john
Author:  Bobc [ Wed Mar 22, 2006 5:56 am ]
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Todd do you know if it has a start capacitor? Do you smell any wire insulation burning?
Author:  John How [ Wed Mar 22, 2006 6:01 am ]
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Most of the time I hear a noise like that on a machine it is the pulley coming loose.
Author:  A Peebels [ Wed Mar 22, 2006 7:57 am ]
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Check the other end. the fan could be rubbing against the shroud. If the noise stops during the coast down period whatever is rubbing is very close to being free. When power is applied the rotor will move axialy a small amount because the rotor is seeking magnetic center in the stator. could be just a bent shroud.
Author:  Todd Rose [ Wed Mar 22, 2006 9:32 am ]
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Hey, thanks for your help, you guys. I'm glad I asked the question, because I learned some things and know what to look for in the future, but in this case, um, duh...

It was the fence rattling against the table.      Yeah, I feel pretty stupid. Funny that it never made such a clatter before. Here I was so sure I'd isolated the noise to the motor by disconnecting the belt. I'd even checked all over the machine for things that could be rattling, but somehow overlooked the fence. The machine doesn't vibrate very much at all, but just enough, I guess, with the fence positioned just so...

Thanks again.
Author:  Steve Saville [ Wed Mar 22, 2006 11:21 am ]
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The best fixes are like this one - FREE!
Author:  Larry Davis [ Wed Mar 22, 2006 1:36 pm ]
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[QUOTE=Todd Rose]
It was the fence rattling against the table.      Yeah, I feel pretty stupid. Funny that it never made such a clatter before. Thanks again.[/QUOTE]

Todd, I can appreciate your confession A few years ago I had a new stereo installed in my truck. After a couple weeks, the door speaker rattled every time I opened or closed the door so back to the store I went for a tighten job. The tech went thru everything several times, but when the door was closed it still rattled. I was standing in the open door watching the tech once more turn screws and bolts, I looked down into the door pocket as stupidity flushed over my face and I covertly reached into the side pocket, carefully removed the mini flashlight from it's hidden LOOSE spot and slid it into my back pocket. After the tech made his last frustrating check of things we closed the door and guess what...no rattle. I high-fived and congratulated him on fixing the problem. Hopefully to this day he talks about "the tough one" he diagnosed and repaired     
Author:  sfbrown [ Wed Mar 22, 2006 1:45 pm ]
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Todd,

I'm glad you found the problem but I want to point out another source of noise in single phase moters, the starter winding. In single phase, there has to be something to get the motor moving in the correct direction and that is generally a separate winding. It can come loose and rattle.

Regards, Steve
Author:  Iplaytheoldies [ Wed Mar 22, 2006 1:49 pm ]
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Todd, what is your thoughts about the Jet product? I am thinking about getting there 18" bandsaw but Fine Woodworking just came out with there annual tool issue and rates the Grizzly as there best buy saw. Most people rate grizzly lower on there list and Jet usually gets great ratings but in this case the ratings differed. Laguna and Bridgewood were rated best overall but I can't afford over $2000 for a bandsaw. I want to be able to resaw and my instinct says go with Jet, but should I trust the mag and go with Grizzly? The price is very close. Opinions could sway my decision.
Author:  sfbrown [ Wed Mar 22, 2006 1:49 pm ]
Post subject: 
[QUOTE=Larry Davis] [QUOTE=Todd Rose]
It was the fence rattling against the table.      Yeah, I feel pretty stupid. Funny that it never made such a clatter before. Thanks again.[/QUOTE]

Todd, I can appreciate your confession A few years ago I had a new stereo installed in my truck. After a couple weeks, the door speaker rattled every time I opened or closed the door so back to the store I went for a tighten job. The tech went thru everything several times, but when the door was closed it still rattled. I was standing in the open door watching the tech once more turn screws and bolts, I looked down into the door pocket as stupidity flushed over my face and I covertly reached into the side pocket, carefully removed the mini flashlight from it's hidden LOOSE spot and slid it into my back pocket. After the tech made his last frustrating check of things we closed the door and guess what...no rattle. I high-fived and congratulated him on fixing the problem. Hopefully to this day he talks about "the tough one" he diagnosed and repaired     [/QUOTE]

Larry, I remember a car tech telling me about the little old lady who complained bitterly about noise in the car. After many trips to the dealership it was discovered that the noise was from some coins in the coin holder. She had put dimes where the quarters go and there was enough room left to rattle. I figure she must have been one of my elementary teachers who could hear a pin drop. I never got away with anything!

Regards, Steve
Author:  Todd Rose [ Wed Mar 22, 2006 8:48 pm ]
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[QUOTE=Iplaytheoldies] Todd, what is your thoughts about the Jet product? I am thinking about getting there 18" bandsaw but Fine Woodworking just came out with there annual tool issue and rates the Grizzly as there best buy saw. [/QUOTE]

I'm not sure I can really help you much. My saw is the 14", and I've been pretty happy with it, but it's the only one I've owned. I have several Jet machines, no major complaints about any of them, but I've never felt that they're really kick-butt, solid, precision machines either. They work. Probably as good as any new mchines in similar price ranges. They did all vibrate quite a bit until I replaced the belts with link belts and tweaked whatever could be tweaked. On a band saw you're likely to be replacing several stock parts with upgrades - belt, blade tensioner, blade guides, etc... adding a brush to clean the lower tire while the machine runs, improving dust collection...

One thing I wonder is why go with the 18" saw. A 14" saw with a riser block can resaw guitar plates no problem. Just something to think about if you hadn't already thought about it.
Author:  Todd Rose [ Wed Mar 22, 2006 8:49 pm ]
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[QUOTE=sfbrown] Todd,

I'm glad you found the problem but I want to point out another source of noise in single phase moters, the starter winding. In single phase, there has to be something to get the motor moving in the correct direction and that is generally a separate winding. It can come loose and rattle.

Regards, Steve[/QUOTE]

Thanks, Steve. Good thing to be aware of.
Author:  csullivan [ Thu Mar 23, 2006 12:38 am ]
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Todd,
I own the Grizzly 17" G0513 bandsaw and have absolutely no complaints.
I was pleasantly surprised when I first got it to see how straight the blade
tracks. I never have to compensate for blade drift. It has a 12" height
capacity and a 2 hp motor wired for 220. I can't imagine needing anything
bigger than this. Granted, I don't do a lot of resawing, but even with a
regular old 1/2" blade, it does a great job. Shortly I will be ordering a
better blade for resawing, but until then, this saw does everything I need
it to do. At $795, I think it's a great deal, and you don't have to take it
apart to put in riser blocks to increase capacity. Just one guy's thoughts.
Craig
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