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A smoothing plane (for wood) would have a slightly curved sharp edge, and square corners. Thus it will carve a series of VERY shallow grooves - usually undetectable.

Since most emery stones used for sharpening usually are slightly dished, the 'curved sharp edge' of the plane iron is produced naturally.

Actually the slightly curved corners of the cutting edge are deliberately created during sharpening, to avoid square corners inadvertently cutting trench/grooves into the planed surface.

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Q: Why are the corners of a smoothing plane slightly rounded?
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