I started a saw job yesterday and noticed there was a lot of sound coming from the blade housing. It sounds a lot like what you would expect from the offspring of a flat tire and a jet engine. There is a lot of vibration and I noticed no matter how I tightened the blade it was bouncing. I finished the job (around 1000 board feet) but I cant say It was my favorite job experience.
Any one have any Idea of what may be causing this?
Did you try another blade?
The belts on your bandwheels are likely worn out. Or a bad bearing on one of your shafts. Or a bent shaft. Or a bad blade. Something is out of balance or no longer concentric.
I see this on my mill. Running full throttle, no load, I'll see the top of the blade as a blur. The noise coming from the mill is more. I'll adjust the tension one way or another, usually a little more, and it'll smooth right out like magic. No more rattling. It's the harmonics causing it. The vibrations from the engine and all spinning parts add up and make it happen. Changing this using the tension gets rid of it. I'm sure you could slow down the engine to a certain rpm and it'll go away too, but we always cut at full throttle so this is where you adjust to.
Edit: After reading the other replies, I see I didn't think of sawdust buildup under the wheel belts. So typical of me to go to the worst and hardest instead of the simplest and easiest! Sorry about that - it's a good thing there are many smart folks around here to help! :P
It might be sawdust built up on the surface of a bandwheel belt. More likely, though, it's sawdust building up under the belt. The bandwheels have balancing holes drilled into the bottom of the V-groove and once in a while sawdust gets packed into one of the holes. When that happens you'll find sawdust starting to build up at that spot. The solution is to scrape the bottom of the V-groove.
I've only had it happen a few times, mostly when I'm sawing snow-covered logs.
I did try a new blade Mt. Man, same thing happened. I will check the V-groove, It dose seem like it is out of balance. Haven't been sawing any snow covered logs but I have been sawing a lot of sappy stuff.
I would revv the blade full speed, disengage the drive/clutch, then quickly step around and watch as it coasts to a stop (with the blade covers off). Looking and listening for anything. If it's bad as you say you might be able to see what's up. Be careful and keep your hands out of there when the engine is running or things are moving.
Quote from: terrifictimbersllc on February 06, 2017, 08:33:01 AM
I would revv the blade full speed, disengage the drive/clutch, then quickly step around and watch as it coasts to a stop (with the blade covers off). Looking and listening for anything. If it's bad as you say you might be able to see what's up. Be careful and keep your hands out of there when the engine is running or things are moving.
My woodmizers dont ''coast'' to a stop so that would be difficult. I think his problem is probably either bad belts or more likely sawdust lumps under the belt on the drive side. We had them bad enough once that the band would not stay on. A few minutes with a screwdriver will fix it.
PC
Quote from: paul case on February 06, 2017, 12:25:53 PM
Quote from: terrifictimbersllc on February 06, 2017, 08:33:01 AM
I would revv the blade full speed, disengage the drive/clutch, then quickly step around and watch as it coasts to a stop (with the blade covers off). Looking and listening for anything. If it's bad as you say you might be able to see what's up. Be careful and keep your hands out of there when the engine is running or things are moving.
My woodmizers dont ''coast'' to a stop so that would be difficult. I think his problem is probably either bad belts or more likely sawdust lumps under the belt on the drive side. We had them bad enough once that the band would not stay on. A few minutes with a screwdriver will fix it.
PC
Yes I guess it depends on how well the brake strap is adjusted.
I found the culprit, or should I say culprits. There were quite a number of nodules of sawdust on the wheel.
Thanks for all of the advise gentlemen.
(https://forestryforum.com/gallery/albums/userpics/44490/IMG_20170206_210854307~0.jpg?easyrotate_cache=1486475532)
Thanks for taking the time to post a picture of the culprit.
Gerald
A couple of B56's will fix that problem. ;D
Quote from: Ga Mtn Man on February 07, 2017, 10:27:54 AM
A couple of B56's will fix that problem. ;D
when I had my lt40, I preferred the 56,s as well. To get them on, I would put them over my defroster holes in pickup truck dash and heat them up big time. Made the job a little easier.
Quote from: Ga Mtn Man on February 07, 2017, 10:27:54 AM
A couple of B56's will fix that problem. ;D
They fit tighter than what comes standard?
Quite tight. Nothing gets under them... but they're kind of pain to install. It's an acquired skill. Do a search on B56 and you will find a number of "spirited" discussions on the subject.