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How much bandsaw vibration is 'normal'?

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Forum topic by Todd1561 posted 04-29-2014 02:14 PM 1433 views 0 times favorited 21 replies Add to Favorites Watch
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Todd1561

27 posts in 1633 days


04-29-2014 02:14 PM

So I just bought a new Laguna 14-12 bandsaw. I think it’s their first foray into the Asian-import market, but I figured since it’s Laguna it can’t be too bad. So far so good with one exception, it seems to vibrate more than I’d expect. But I haven’t used another bandsaw in over 10 years, so I don’t really have a good frame of reference to know what’s normal. It’s also hard to quantify how much vibration I’m getting. It will usually pass the nickel test during startup and running, but when I go to shut the machine down it will hit a resonance point during spin down and the nickel will fall. Also, if I leave a small board on the table while running it will eventually vibrate off.

I can also see the top of the machine shaking quite a bit while running. The machine is very well leveled and does not rock on the floor, I spent a lot of time making sure of that. If I just run the saw without the blade it’s perfectly stable, so it would seem the motor, belt and lower wheel are fine. It’s when I introduce the blade and upper wheel the machine shakes. I’ve tried a couple different new blades and it behaves the same. I’ve spun the upper wheel by hand and it always stops at a different spot, so it doesn’t seem like the wheel is balanced too poorly.

I’ve contacted Laguna and they acknowledged that they’ve had some complaints with this model and they traced it down to defective tires, so they shipped me a couple new tires. I installed those but it didn’t help. Before I contact them again I wanted to get some opinions about how much vibration I should experience. The saw seems usable the way it is, but the vibration is just more than I was expecting. So if there’s an underlying problem I’d like to get it fixed while still under warranty.

As a side note, I’ve read many times about terrible customer service with Laguna. I found them very easy to work with so far and they sent out the replacement parts very quickly. Granted, it didn’t fix my problem, but it’s a start. And if nothing else I have a spare set of tires for free!

Thanks


21 replies so far

View Paul Maurer's profile

Paul Maurer

154 posts in 494 days


#1 posted 04-29-2014 04:20 PM

Wheel out of balance. It has two speeds? Check the other speed setting. Look for change of frequency proportionate to RPM change.

-- Psalm 62: 11 Once God has spoken; twice have I heard this: that power belongs to God, 12 and steadfast love belongs to you, O Lord. For you repay to all according to their work

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MrRon

3290 posts in 2183 days


#2 posted 04-29-2014 04:25 PM

In any system in motion, there are many different areas where something out-of-balance can cause vibration. A band saw is not a Swiss watch movement. Some vibration can always be expected. IMHO, I would not worry, especially since it passed the nickel test. One thought; the belt could be the culprit. You could try a link belt.

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bigblockyeti

2278 posts in 660 days


#3 posted 04-29-2014 04:33 PM

If the top of the machine is moving while running, it could be an out of balance wheel, or problem with concentricity in either one of the wheels or tires, causing the tension in the blade to fluctuate significantly and rapidly.

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Todd1561

27 posts in 1633 days


#4 posted 04-29-2014 05:20 PM

Thanks for the replies guys, there’s only 1 speed. And it only sort of passes the nickel test (falls during spin down). I suspect the upper wheel as well. I might rig up something to measure any variance in the concentricity with my dial indicator. I’ve reopened the case with Laguna, waiting for a call back.

I’ll report back with the final resolution, if any.

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Todd1561

27 posts in 1633 days


#5 posted 04-30-2014 06:52 PM

It was an unbalanced top wheel. I pulled it off and put a marble on the inner race of the bearing and noticed the wheel would always fall to one spot. I cut a couple pieces of heavy bailing wire and wrapped them around the two opposing spokes and it balanced better. The vibration is significantly better now (passes nickel test from start to stop) and I suspect could be even better with a professionally balanced wheel. I talked to Laguna again and they are going to ship another. Luckily the wheels are very easy to remove/replace, I figured I’d need a bearing puller, but not so.

So if there’s anyone else out there with a 14-12 that vibrates, check out the wheel balance. I now know these machines have the ability to run very smooth.

View jacquesr's profile

jacquesr

288 posts in 362 days


#6 posted 01-27-2015 09:46 PM

Hello Todd,
Thanks for starting this thread.
I am in the very same situation.
It vibrates too much to my linking.
Did the new wheel fix the problem?

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Todd1561

27 posts in 1633 days


#7 posted 01-27-2015 09:53 PM

Yes the new wheel fixed the problem. It’s been running fine for several months now. They first sent me a set of new tires as they said they had a run of bad ones, but that didn’t help. Then they sent the new upper wheel (easy to replace) and that fixed the problem. So now I also have a spare set of tires to use one day!

Good luck,
Todd

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jacquesr

288 posts in 362 days


#8 posted 01-28-2015 12:23 AM

Thanks Todd – They are sending a new (winter!) tire for the upper wheel and probably a new table…. I have 10th of slope…

View jtm's profile

jtm

193 posts in 576 days


#9 posted 01-28-2015 12:35 AM

For what it’s worth, my 1412 vibrates like crazy.

Bought it in May at Rockler, and have used it all of a handful of times.

Maybe I should look into it a little more.

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daddywoofdawg

563 posts in 514 days


#10 posted 01-28-2015 12:45 AM

you could always get some lead tire weights from any tire store and place them on the wheel.

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MrRon

3290 posts in 2183 days


#11 posted 01-28-2015 05:17 PM

I know this is not an easy fix, but changing the speed the wheels rotate could improve the problem. Belt driven machines will have a point of resonance where vibration will be at it’s worst. Just changing the speed a few rpms could eliminate the vibration, by either going past the resonant point or staying below the resonant point. If you have an older car or truck, you will notice a certain point where something on the dash vibrates, but goes away after the speed changes. That’s what happens with machines. Check your saw for loose metal panels that can vibrate in sympathy.

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jacquesr

288 posts in 362 days


#12 posted 01-28-2015 05:20 PM

Based on my talks with Laguna, they seem to have occurrences where the tires were not installed perfectly.
We will first try chaining the top one.
The local rep claims the machine should be running very smoothly….
TBC…

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jacquesr

288 posts in 362 days


#13 posted 02-01-2015 11:19 PM

Update: installed new tires sent by Laguna.
Fast shipping, very happy.
Much less vibration now, probably at normal level.
I still think there is bit too much…
I have often used a 17’ General – so stable it’s as if the engine was in the other room…
The Laguna rep for my area will probably come check it out.
I was ready to swing for Carter’s tires, but the rep indicated the Laguna are polyurethane too, so it should not make a difference.

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jacquesr

288 posts in 362 days


#14 posted 02-14-2015 04:05 PM

Todd – could your describe how smooth your run?
In my case, after changing the tires, If still can feel the table vibrate a bit – not sure how to describe.
If I put a 5 cents, it will eventually fall after 20 seconds.
Thanks

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toolie

1865 posts in 1568 days


#15 posted 02-14-2015 05:17 PM

If I put a 5 cents, it will eventually fall after 20 seconds.

that’a too much vibration. here’s what a new blade from itutta design did for a terribly less than satisfactory 18” jet bs with the wheels left in a non-coplanar condition bey an authorized jet dealer:

https://www.youtube.com/watch?v=YVj_4Hq3uHE

...I figured since it’s Laguna it can’t be too bad.

while they replaced the defective part, i’d be left wondering what i’d paid for if it got to a customer in that condition.

-- there's a solution to every problem.......you just have to be willing to find it.

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