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Why do some people say circles are bad for sharpening?

Personally i find that the spine is more likely to come up when doing circles. Don't use them much. Maybe at 1k. Normally just half stokes and x strokes.
 
Why don't we shave with circular strokes, or strop with circular strokes? Because they are bloody and less effective. It is the inertia of friction that drives the cutting edge, nose diving it into the stone when using edge leading strokes, encouraging intimate contact with the business end of the razor into touching the stone when honing and or shaving.

Honing is a rhythm, and ergonomically speaking edge leading strokes are more anatomically natural than circles. We don't shave with the spine, but the spine must mimic the cutting edge in it's parallel. Circles always leave a portion of the blade/spine off the stone at some moment in the motion.

Circular strokes leave a messy scratch pattern on the face of the bevels that will have to be cleaned up with edge leading strokes, so why begin with less regular than what will eventually represent the geometry of the edge.

Alx
 
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