I burn about 90% black locust. If cutting dead I shallow up the grind angles on the chain to provide more strength to the cutters edge and add more depth to the guide teeth. Will not cut as fast but lasts a whole lot longer. Keep a bucket of chains ground that way. I have an Oregon grinder but after the changing the angles I still use a file unless a chain is messed up. Have found grinders waste more chain but if you do not want to learn how to file right it is the best option. A tooth on a chain is a compound angle tapering from front to back and from side to centerline. if the point of the teeth on one side gets longer than the other, the saw will cut a radii instead of straight as the longer side takes a heavier chip. Dead locust will spark pretty cool
