Oregon 520-120 Stihl Angles

[jthornton]

I have an Oregon 520-120 and have 3 Stihl chain saws, an 021, MS291 and MS391.
Trying to figure out what angle to set the sharpener at for my chains.
The MS391 chains I have are 3652 005 0084 36RM 84. The Stihl USG chart lists A (head tilt) +40°, B (not sure what that is) ±15° and C (table angle) ±30°, raker depth 0.25" and the last column has RS 60° and RM 75° but I'm not sure what that might be for, the image shows the angle of the cutter edge it seems. From reading other old posts they USG head tilt is backwards from the Oregon so 90°-40°=50°.

Is it 50° for chains that are not RS or RM?

Thanks
JT

 

[huskihl]

For an RS chain, I set mine at 55 and 25. On an RM, I lean the grinder over more to 50 in order to try to get a little bit of hook so the cutter will bite.
And don’t bury the grinder all the way down to the tie strap

 

[davidwyby]

For an RS chain, I set mine at 55 and 25. On an RM, I lean the grinder over more to 50 in order to try to get a little bit of hook so the cutter will bite.
And don’t bury the grinder all the way down to the tie strap

The angles and this Stihl grinder ain’t the same

relearning

I like faster angles anyway :-D

 

[huskihl]

The angles and this Stihl grinder ain’t the same

relearning

I like faster angles anyway :-D

Yeah that whole stihl grinder angle thing is weird

 

[jthornton]

For an RS chain, I set mine at 55 and 25. On an RM, I lean the grinder over more to 50 in order to try to get a little bit of hook so the cutter will bite.
And don’t bury the grinder all the way down to the tie strap

Thanks
JT

 

[president]

The angles and this Stihl grinder ain’t the same

relearning

I like faster angles anyway :-D

the stihl usg is a learning curve for sure but gives out of the box or better
results