Chain Sharpening issue...driving me nuts!

[altair]

No, not square grinder...hand filing here.

 

[HarleyT]

when this happens I have to use a little Diamond bit on a 12V sharpener to do it..and I've always been a hand filing guy so would rather not use this sharpener.

This gave us the idea that the chains may have seen a grinder.

 

[KMatt]

I have this happen occasionally. When my file “chatters” on a cutter it’s always on the first stroke. When it happens I try to put more pressure and run the file slower. One slow hard pass breaks through the hard layer. No big deal and never thought much about it. All I use is Oregon files. Now that I think about it, it probably is more common in coworkers saws that have been ground and likely cut with when dull. And when using a dull file.

 

[s sidewall]

Looks like the wrong size file was used, after looking at that picture .

Steve

 

[Bwildered]

Not a good pic..looks like it has no Gullet!

Get a new round file & don't be touching the file in the gullet on the back stroke, they last longer but not forever & will eventually stop cutting & skate across the tooth without doing much.
Thanski

 

[Okie]

You will still encounter a hardened tooth or raker every once in awhile on some chains. (maybe one or two)
Just slow down and sharpen it them normally even though the filing feels like its going across glass. Rotate the file a 1/4 turn and try for feel again.
Rotate and clean the file every once in awhile. A really hard tooth can ruin a file also.

I've got the electric type grinders but never use them. I always just hand file and look very closely at the first tooth I sharpen to see if looks correct instead of sharpening all teeth first then looking when it don't cut.