Sawmill vibration

[ktm250rider]

For those of you that have built your own sawmills, how much vibration do you get through the blade?  i have a cheap Lifan 22hp engine and i believe that is the problem.  At least that is what im telling my wife, because i want to replace it since i cant get it to idle.  I can feel vibration through the frame and can visually see the bladed vibrating.  My cuts are clean but Im just wondering if this is normal.  

[never finished]

I didn't build my mill, but it has vibrated since day one. I can see and feel it even at an Idle. If it don't show up in the  cut run it. The little bit of pressure in the cut seems to take care if the vibration. 

[doc henderson]

I get some vibration for a few seconds when I engage my blade with an electric clutch, but it is gone at full speed.  If it is cutting smooth i guess it is ok, but it may be a component that needs repair or tweaking.  pulley allignment, and many other things can contribute.  I won't tell your wife.   

[Jeff]

Well, at risk of your wife likeing me more than she did, I highly doubt the vibration is born within the engine.

[esteadle]

l22

[esteadle]

l22

[Percy]

Well, at risk of your wife liking me more than she did,

[SawyerTed]

Before major surgery, do a close inspection of the wheels, drive belt, pulleys, shafts and bearings.  It could be as simple as a lump of pitch and sawdust in a groove under a belt. a nick in a belt or other simple solution.   

Blade guides may need an adjustment or bearing replacement.  Is your mill designed to have down pressure applied to the blade by the guides?  Some mills do have as much as 1/4" of adjustment on the guides to apply pressure to the blade.  

Correcting a fluttering blade could be as simple as turning up the tension by a couple hundred pounds.  

[ktm250rider]

That is one thing i havent gotten around to is measuring blade tension.  I have a simple screw with die spring for tension.  Perhaps my die spring is sacked and not providing the proper tension.
I will also look for in-balanced parts.  Cant remember on first start up if i saw the same vibrations.

[doc henderson]

Mine has a tiny hydraulic ram that the screw passes through and has a gage to measure tension.  I run at about 1300 psi.

[YellowHammer]

If your engine is causing the vibration then take the band off, disconnect the main drive belt and run it up. 

If it's not vibrating, then it isn't the engine.

Then connect the single drive wheel and main drive belt and run the engine up again.  Any vibration?

Then, put the band on, and run it up again.  Any vibration?

Through process of elimination, you should be able to see where it is coming from.

[Percy]

If your engine is causing the vibration then take the band off, disconnect the main drive belt and run it up.

If it's not vibrating, then it isn't the engine.

Then connect the single drive wheel and main drive belt and run the engine up again.  Any vibration?

Then, put the band on, and run it up again.  Any vibration?

Through process of elimination, you should be able to see where it is coming from.

Logic.

[stihltoomany]

Buy better belts.