Long Bar Chain Tooth Angle

[Brewz]

Hi folks.

I have bought a42" bar for my 066.
I have used it once with Stihl 3/8 .063 semi chisel chain and it went great.

I am wondering if there is an optimal different chain tooth angle for longer bars.

Is the standard 30* good or should I cut it back to 25 or 20* for better performance?

I only cut hardwood, so dont recommend what works in pine

 

[shorthunter]

Surprised nobody has answered this.

The cutting corner severs the wood grain, more top plate angle = sharper cutting corner = faster cutting chain.


30° will cut better but the tooth will not hold an edge very long in dirty conditions
25° will cut a little slower but will be more durable in dirty conditions
20° probably shouldn't be used on your saw

 

[mdavlee]

I sharpen all the same. Raker depth changes. I file chisel square.

 

[Hedgerow]

Surprised nobody has answered this.

The cutting corner severs the wood grain, more top plate angle = sharper cutting corner = faster cutting chain.


30° will cut better but the tooth will not hold an edge very long in dirty conditions
25° will cut a little slower but will be more durable in dirty conditions
20° probably shouldn't be used on your saw

Don't forget, that for usability on a long bar, more angle will pull a little wider kerf. You may give up a little speed, but not enough to notice on a 30" stick, and the wider kerf will mean less prone to bind when guiding it through a cut.
I know ole Freehand liked to put a little more angle on his cutters when freehand slabbing countertop material.
Said he could guide his bar a little better.

 

[Deets066]

Raker depth is most important in your situation

 

[Brewz]

Thanks folks I will run it as is.
Seemed to work fine, was mainly wondering if there was a better option on a long bar to prevent overloading and wearing out the clutch

 

[Deets066]

Thanks folks I will run it as is.
Seemed to work fine, was mainly wondering if there was a better option on a long bar to prevent overloading and wearing out the clutch

Have you modified the oiler yet? I wouldn't run a 42 on a 660 without an oiler mod

 

[Brewz]

No, I just ran it wide open

Please explain

 

[Deets066]

No, I just ran it wide open

Please explain

660 won't oil enough for a 42" with the stock oiler. I thought Somone did an oiler mod thread here.

I haven't modded one yet, so I wouldn't be the best at explaining it

 

[Moparmyway]

Thanks folks I will run it as is.
Seemed to work fine, was mainly wondering if there was a better option on a long bar to prevent overloading and wearing out the clutch

Run full chisel and square file it ............. the square cutter is more efficient, so it will load your saw (clutch) less. You can even run a skip sequence to unload your saw even more