Author Topic: bandsaw vibration (Read 18667 times)

Acer Saccharum · « **Reply #25 on:** January 13, 2010, 12:28:45 AM »

I didn't think he was kidding.

I just find it funny as all get out.

You could run your whole machine shop off a gas engine and line shafting. This kind of adaptation is fantastic.

What vibration?

Ky-Flinter · « **Reply #26 on:** January 13, 2010, 01:02:27 AM »

Now THAT is a bandsaw!

-Ron

westerner · « **Reply #27 on:** January 13, 2010, 02:36:14 AM »

Acer, if you think thats funny you should see my air compessor. It has an electric motor. It makes people blink and stare. Sometimes I stop and look at it and it makes me blink a little too. It still works so it stays!

Joe.

KY Shinner · « **Reply #28 on:** January 13, 2010, 03:08:41 AM »

What is the saying "ingenuity is the mother of all invention" Nice job on the bandsaw. I guess you could take that on the road with you.

Ed

Kermit · « **Reply #29 on:** January 13, 2010, 03:28:30 AM »

I think you might be chasing the wild canard if you start with the belt.

Important info there when you said it does NOT vibrate with no blade. That tells me it's not likely to be motor, pulleys, belt or lower wheel. The vibration starts when you put a blade it it, no? So start looking at the blade and the upper wheel. But you said it does the same regardless of the blade used, so I think it should be narrowed to something with that upper wheel.

Take a look at alignment, the tire, tension, bearing, balance weights. Not much else up there, and I think you've pretty much ruled out blade or lower elements.

You did check your guides, didn't you?

Acer Saccharum · « **Reply #30 on:** January 13, 2010, 04:46:39 AM »

Kermit, it makes the vibration only while cutting. So it's either the blade developing harmonics or the belt slipping while under load. Or the backup bearing on the guides all dried up and screaming for replacement.

...or the devil yelling in his ear when he starts to saw.

elk killer · « **Reply #31 on:** January 13, 2010, 04:51:22 AM »

i got a new belt,,much to zero avail
i have checked and checked eveything
i bought a new blade as well today
still the same old story..
the guy at the wood craft store suggested
i replace the rubber on the drive pully with the new plastic ones they have out
it just scares me when it vibrates so bad..
i have always had a upmost fear of power tools and fingers,,!!!!

Joey R · « **Reply #32 on:** January 13, 2010, 05:51:40 AM »

It bodes well for you to continue to have respect for your power tools and any others for that matter. When the buddies stop in at my shop shoot the bull is when I pull the plug on the tools. Just a suggestion but recheck alignment and set screw on the motor drive pulley. Also, recheck again for the balance weights on the wheels for sometimes they can be quite small and missed. I thought I had that covered once and later found out that it was in my sawdust vac. Good luck!

Acer Saccharum · « **Reply #33 on:** January 13, 2010, 06:47:40 AM »

Elk, What do you you mean...vibrates so bad....like it's gonna jump around and take your hand off? or is it just noisy?

Is this what it's like: It runs without vibrating, but then starts vibrating when you cut?

How about checking the wheels for cracks. take the blade of and tap the wheels. Do they ring or do they have a rattle or buzz when you tap them.

Spin the ball bearing guides by hand, see if they turn freely without a gritty feel.

westerner · « **Reply #34 on:** January 13, 2010, 01:57:15 PM »

Could the lower tire be a bit loose ? Then bunching up when you apply pressure on it when cutting?

I had to glue the tire onto the wheel on my suped up gas powered saw.

Joe.

oldiemkr · « **Reply #35 on:** January 13, 2010, 05:18:25 PM »

This is getting interesting. If everthing as stated is checked out what the heck could be left?

Most of these have a tilting table for angle cuts and I believe you said you checked for tightness. Did you get a good look at the castings where it bolts up and where it pivots? Sometimes they are a little light in this area,especially in smaller stuff.

Look for a possible crack somewhere in the table mount system. Since it started all of a sudden something might have let go. It only does this when cutting,right?

Clowdis · « **Reply #36 on:** January 13, 2010, 05:51:41 PM »

Mine had a vibration problem a while back and I solved it by replacing the tires on the wheels. They stretched after a few years and began bunching up underneath the blade when I was sawing. I suppose they should be replaced every few years just as a measure of routine maintenance.

Acer Saccharum · « **Reply #37 on:** January 13, 2010, 05:52:12 PM »

It sounds like a cracked casting somewhere, as this started suddenly, according to ELK. Vibrates only while cutting. so under load, something starts to vibrate, perhaps bad enough to break all the way. Then you'll know what it is. But you may not want to find out this way.

Safety first!

Tom

oldiemkr · « **Reply #38 on:** January 13, 2010, 08:22:23 PM »

Could the drive wheel have a broken or sloppy key in the shaft or pulley?

Kermit · « **Reply #39 on:** January 13, 2010, 08:45:47 PM »

Maybe it's time to resort to listing it on C-list and getting a new Grizzly.

Let someone else sort the problems. I did that with my tired old Delta about a year back, and I'm a VERY happy camper. Best machine purchase I've made in ages.

elk killer · « **Reply #40 on:** January 13, 2010, 08:53:15 PM »

it makes no more noise than it ever did
it dont matter what size blade or what tension
it wont vibrate with no blade in it
soon as i put a blade in it,,it vibrates
its like its going to just hop across the cement floor
i would think if it was the weights it would do it all the time
i have checked all the casings,,and the stand its on
its a 14 inch craftsman
i have had it for exactly 30 years
never had any problems until now

Benedict · « **Reply #41 on:** January 13, 2010, 09:00:23 PM »

If I understand correctly, it vibrates when there is a blade in it not necessarily when cutting. Is that right? If so, I still think you should check the tires on both wheels. One of them may have gotten brittle and broken or slipped.

Good luck.

Bruce

John Archer · « **Reply #42 on:** January 13, 2010, 11:14:26 PM »

I had bad vibration on a craftsman bandsaw...I tried everything under the sun to diagnose the problem and finally put new tires on it. Now it's smooth as silk.

John.

Acer Saccharum · « **Reply #43 on:** January 14, 2010, 12:08:42 AM »

Quote from: elk killer on January 13, 2010, 08:53:15 PM

it wont vibrate with no blade in it
soon as i put a blade in it,

Something wrong with your top wheel. Clean the wheel completely, front and back to get any imbalanceing dirt out of it.

Check the tire. Is it smooth, completely attached? When you spin the wheel, is there a lump in it?

Spin wheel by hand. Listen to the bearings. Also see if it stops in the same position every time. Could be a heavy spot, wheel out of balance.

Kermit · « **Reply #44 on:** January 14, 2010, 02:36:16 AM »

Yup, top end. Look for someone in your neck of the woods who's used to setting up a bandsaw right, and enlist help--unless you're enjoying futzing with this machine. If you'd rather get back to work, on-site help may be in order.

John Knaack · « **Reply #45 on:** January 14, 2010, 09:27:51 PM »

Sometimes bad bearings seem good with no preload. You may be able to spin the bearing assembly 180 degrees and have no vibration at all. If it is just a worn race, this may work for a time.

westerner · « **Reply #46 on:** January 21, 2010, 11:21:18 PM »

The suspense is killing me! Well? Is it fixed? What was it?

Joe.

Acer Saccharum · « **Reply #47 on:** January 21, 2010, 11:39:17 PM »

I think the fix was a new 14" bandsaw from Sears.

Acer Saccharum · « **Reply #48 on:** January 21, 2010, 11:40:22 PM »

I would like to know after all the blabbing we did about this problem. Winning suggestion gets a free beer at Lewisburg.

elk killer · « **Reply #49 on:** January 22, 2010, 01:09:28 AM »

i bought a new motor..
after all the checking and rechecking i had done
and pulling what hair i have left out..
the shaft on the motor was somehow warped
wasnt the motor bearing ,,but the shaft was bent..
works like a dream agin now

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Author Topic: bandsaw vibration (Read 18667 times)

westerner

KY Shinner

westerner

oldiemkr

oldiemkr

John Knaack

westerner