I think people get confused with things like "How do I sight two lines at the same time" or "How do you see two lines that aren't parallel?"
Fact is--- geometrically speaking the CTEL and edge to B are parallel, but perceptually speaking--- none of these lines are parallel and who cares.
Depending on the distance, you still must move your eyes off the CTEL to get an edge-to-B visual because the OB is smaller than the CB. Check out the attached image.
Start from the CTEL (eye positioning) and from that point move your head/eyes left or right until you get the proper edge-to-target alignment. You always need to start from the CTEL in order to enable to get the correct "view" of the CB disc. If you're off a little bit because you skipped the CTEL and jumped straight to the target alignment, you'll have a different 180 degree view of the CB disc (or CAN have, at least).
Once you have the correct view of the CB, slide in the visual face of the CB -- along a line that's perpendicular to the face of the CB with your 1/2 tip offset.
When you do this, you're locked onto the CTEL vector and the edge-to-target vector. Sighting two lines concurrently is a much stronger visual aid than relying on 1 line. Helps eliminate MANY illusions. Anyways, I'll explain this in a lot more detail when I'm at my table. Will do something SAT afternoon and post info here.
Dave
p.s.
When cutting left, I'm using my left eye to acquire the inside edge to A/B alignment--- when cutting right I'm using my right eye to get the B/C alignment. Without getting into dominant eye battles, if you feel as though you might have somewhat of a stronger dominant eye-- you need to do this.
Dave,
Isn't this diagram showing a cut to the right?
JoeyA