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Cutting in real hard wood if chains follow a similar principle as saw blades, calls for compromise in the hook angle of the tooth. Giving up some initial cutting speed will allow for greater longevity of sharpness. I assume that must be the reasoning behind Willard's choice of file and method...

I meant Black locust, not Acacia. Seems amazingly hard sometimes.

Bob, dry wood is usually a lot harder too, could be a factor. Especially some species, like Black Acacia. Interested in what Magnus will say, it seems like angles could make a difference, With real hard wood there is the edge durability factor as well.

I know some old timers that were quite adamant about chopping off the bark on large trees where they would be sinking their large saws into them. Save on cutter wear. Often people carried a good tool for doing that bark removal on their belt, that also sufficed for whacking smaller limbs...

Sparks suck.

Consider rehab, Cory.

It might be thought that it is going overboard to be wanting to get edges real sharp with either a file or a grinder, but it has to be kept in mind that sharp with those tools is not very sharp at all, compared to what is obtainable with fine grit sharpening stones, water type or oil, natural or...

My grinder has reversible directions and I try to grind away from the corner, but that means the sparks directly fly at me on the one side or towards a place that I don't want them to go. Sparks in a wood shop. :\: Does it matter about grinding toward the corner or not, if trying not to burn?

Magnus, I'm very willing to listen and try, and appreciate any information. Sharpening has been the root of my work for a lifetime. Not much giving up and passing is the way i go about it. If sought after results weren't obtainable, I would have given up a long time ago. I use traditional...

You may have the same demand as on a knife, Magnus, but there is no way in hell that a file is going to give anything as close to sharp as say an 8000 grit sharpening stone on a woodworking knife, worked up from 1000 grit and with 4000 between. Files or grinding wheels are really crude ways to...

Magnus, not easy to have a serious discussion about chainsaws here, seems like an odd thing to say. I thought we'd been having lhem for many years, could probably fill up a few books. Chris, you are quite right about the determination part. An older retired guy moved in down the road, and...

For me a sharp chain besides seeing it that way, is one where I can drag the flat part of my fingernail across the edge and it catches it, doesn't just slide across. For other cutting edges, easily shaving the hair on my forearm is a good determinant, where the hairs jump away. i find with...

I wonder if wood preservative has some metals content in it or something that is hard on edges?

Wood cutting edges responding to different ways of sharpening are a deep subject, from the feel of sharp to looking at them under a microscope, as some folks like to do. I have been working with them almost everyday for a lifetime. My own opinion, and perhaps similar to Wally's, is that...