Okay let’s assume that a file correctly used makes your hook at 60 degrees (or 40 degrees on a Stihl) and that is forever every time you file it .....
So every stroke you are removing 180 degrees of material assuming your using a guide and if not you might be digging it to the gullet a little deep.
That is a lot of work with a good sharp file.
I tried this several years ago and still practice it today and for some of my customers.
A new chain you been running and on second tank is getting really slow so you pull out your file and go to town and get razor sharp ! And file is the only thing that can!!!!
But it took 2 maybe 3 strokes to do it per tooth it but guaranteed it is sharp !!
I love my grinder and it’s the best thing ever!
what I like to do with any grinder is give my chains that are dull a little more hook than they need.
I started with a 510 Oregon and would set my chains at 55 degrees (they seamed to dull faster in my type of wood) but every tank I would a 1/2 to3/4 light pass with a file and guide and have it razor sharp again.
Because with a guide I was only contacting the top third of the tooth because I ground the gullet further back than what the can reach.
I did this for a few years and when chain were getting close to the end of there lives i was snapping the teeth of because of the extra hook I was applying.
So now I use 57-58 degrees Oregon 41-42 degrees Stihl and it’s the best of both worlds.
I do it for some of my customers too.
And I have customers that will only give my really rocked out chains ( they file a the time til they tear it up) I do notice that sometimes I can get the rocked out but I still don’t have all the cutters at the same angle.
For sure the sharpest chains have ever used is filed but not by much
Super light pass on a grinder with pink stone or CBN wheel will produce a sharp chain
My 2 cents
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