Severe vibration, judder.

[Jim B]

Have been milling with the 3120 and hard nosed 36" bar. Am experiencing severe judder through the mill so much so that both hands absolutely kill by the end of the board. This is on a new chain so not a sharpening issue. Any ideas? Does a roller nose makea Any difference. Is a 36" 404 roller nose available?

[agg221]

Yes, a 36" .404 roller nose bar is available but this is unlikely to be your problem.

 

Firstly, check whether the chain wobbles side to side in the bar.

Is the bar nose getting hot and the chain getting slack?

 

If no to the above then the bar is not the issue. I would check the chain - just because it is new does not mean it is necessarily right.

 

When you are milling, do you run with the bar straight across, or do you have the powerhead slightly forward? In some woods, slightly forward creates a judder. I have particularly found this in oak. Changing the angle may result in it going away.

 

Only other thought is the drive sprocket?

 

Hope something above helps!

 

Alec

[Jim B]

Yes this is oak, it found it was better with holding the saw back from the cut and not letting the powerless get ahead but difficult as the weight of the saw moves it forward faster than the tip. I'm going to go with a slack chain thanks Alec it's annoying on the 3120 and 395 as no side tensioner so often just carry on.

[agg221]

Do you use a winch? If not then it's worth considering if you are having problems with the powerhead getting ahead of the nose - you can mount it to pull the nose end forward and then keep the powerhead moving with it.

 

Alec

[Jim B]

Yes I have a winch dusty in the box!