Crofter
Addicted to ArboristSite
Frank,
I already agreed, but I will defer to anyone who has a better explanation.
Its been hashed a few times before on cutting crooked threads. It is more often damage to the side cutter or area near the working corner and the resulting veer off is in the opposite direction and for a different reason than the one stated. As soon as chain run off starts to happen,(and before chain rails and bar rails get so badly fubarred that no one can tell what the origin of the problem is) if you examine the chain with light behind you, the damaged area is glaringly obvious. I'd bet money any time that almost invariably if a saw suddenly starts to cut to the right, that the LH cutters are damaged on the corners.