flat double bevel chisel bit square chisel chainsaw file

I doubt that square or round filing makes any significant difference. I really think that 80% of it is a relatively sharp blade that is sharpened somewhat correctly. It does a good job and I'm pretty fussy about making the teeth even. When all my chains are dull I sharpen them all at the same time. So my chains last a long time, at least to me it seems that way. I don't drag my logs on the ground, I keep them clean. I'm careful not to ever hit rocks or dirt. I use a chain till its dull or has issues cutting then swap it out for another.

I cut several cords/yr for firewood, a couple of trees for lumber and some more for just clearing, timber stand improvement stuff.

Repeat the same angles on every tooth all cutters need to be the same.I don't know, I'm not claim any kind of expert status.

Maintain the angles of the cutter’s tooth.

Keep the corner of the file aligned with the cutter’s tooth.

Three Rules for Sharpening Square-Ground Chain You can look at the cutter teeth on the second chain to see what the cutter teeth should look like. Tip: A second, new square-ground chisel chain on hand can be a handy reference point for square-ground chain sharpening. A chain that has already been resharpened may still have gullet material attached that needs to be removed. Do not use an old chain – especially one that has been previously filed. The first square-ground chain you sharpen should be a square-ground chisel chain that still has its factory grind.

It’s easiest to file in a setting where your cutters are stable and there’s lots of light. While square-ground filing can be done out in the field, a shop with a light and a work bench is an ideal learning space. Things to Keep in Mind the First Time You File Square-Ground Chain However, the performance advantages of cutting timber with square-ground chain can outweigh the fact the square-ground filing can be more difficult and affords less room for error. Square-ground chain is only used in conjunction with longer guide bars designed to cut larger trees. Since square-ground chain is not very common, most chain saw operators will never have an occasion to perform filing with a square file. When Should You Perform Square-Ground Filing? FAQ Saw Chain Troubleshooting / Sharpening

Flat double bevel chisel bit square chisel chainsaw file