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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 616 views 0 times favorited 5 replies Add to Favorites Watch
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Todd1561

20 posts in 1438 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


5 replies so far

View Paul Maurer's profile

Paul Maurer

146 posts in 299 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

View MrRon's profile

MrRon

2975 posts in 1988 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.

View bigblockyeti's profile

bigblockyeti

1784 posts in 465 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

20 posts in 1438 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

20 posts in 1438 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.

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