what file for Oregon 91 and 90?

[nick21]

I have 3 saws with Oregon 91 chain - looks to be 7/32 or 13/64 is that right? I have found a million different answers most 7/32 or 4.0 mm lol

I got my Stihl 3/8 2 in 1 and it didn't have the same effect on these chains as it did my Stihl .325. (I have three saws w 91 and one pruner with a 90). and yes I got a 2 in 1 for the .325 and a different one for the 3/8

 

[Philbert]

Those are both 3/8, ‘low profile’ chains. Different than full sized 3/8” pitch.

Type 91 takes 4.0mm / 5/32” files.
Type 90 takes 4.5mm / 11/64” files if you can find them, otherwise, use the 5/32”.

Philbert

 

[nick21]

Thank you - so the big question is this....if I filed with the 13/64 3 to 4 passes on each cutter as well as the raker(Stihl 2 in 1 file) is the chain junk? It did not cut very well

 

[Philbert]

Photos would help.

What's likely to happen is that you carved a very deep 'hook' profile in the chain. This means that the entry of the side plate cutting edge will be delayed, and the chain will probably be very 'grabby'. Not junk, if there is still a lot of metal left. Easiest to clean up on a grinder, but you could file back the top plate some with a flat file, then reshape with the appropriate files.

If you cover postage both ways, I would do that for you as part of my 'Challenge Chain' thread:
https://www.arboristsite.com/community/threads/philberts-chain-salvage-challenge.245369/
Philbert

 

[nick21]

Photos would help.

What's likely to happen is that you carved a very deep 'hook' profile in the chain. This means that the entry of the side plate cutting edge will be delayed, and the chain will probably be very 'grabby'. Not junk, if there is still a lot of metal left. Easiest to clean up on a grinder, but you could file back the top plate some with a flat file, then reshape with the appropriate files.

If you cover postage both ways, I would do that for you as part of my 'Challenge Chain' thread:
https://www.arboristsite.com/community/threads/philberts-chain-salvage-challenge.245369/
Philbert

Thank you Philbert - I will post a pic. I have three chains I did it to!

 

[Philbert]

Confusing ’3/8 low profile’ and ‘full sized 3/8’ pitch is quite common.

There are also some narrow kerf chains that take different files than others of the same ‘pitch’ (rivet spacing).

It can be a challenge to keep up!

Philbert

 

[nick21]

 

[nick21]

 

[nick21]

 

[nick21]

What do you think ? Is there enough there to work with ? I bought A Stihl 3/8 P 2 in 1 file with the 4.0s

 

[Philbert]

You will be fine. Just file them with the correct file.

Philbert

 

[nick21]

You will be fine. Just file them with the correct file.

Philbert

Thank you Philbert !!!