I understand the 60 degree,and the 25 or 30 degree for the top of the cutters.What I'm asking about is after you swing to the 30 degree or 25 degree angle,there is also an adjustment from zero to 10 degrees.
Most full-chisel chains ( flat top plate meets flat side plate at right angle with a sharp point at front of tooth ) call for a 10 degree horizontal tilt of the file. On the sharpener just click the chain vise to the position that lifts the heel of the tooth above the front point of the tooth. Do all teeth on one side of the chain, then reverse both the vise tilt and top plate angle and do the teeth on the other side.
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Lots of chains are sharpened this way with no complaints. I think it boils down to how professional you want to be about the whole thing.
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