Reply To: Plane blade hollowed out in center
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There are a few ways I see this could happen.
1. You hand sharpen without a jig/fixture and flex the blade at the center, pressing hard.
2. The temper is damaged at the center of the blade making it soft and cut faster.
3. The diamonds are worn off on the perimeter of the plates.
Are these thin plates? They may be flexing under pressure.