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Why Did My Knife Chip or Dull, and How to Fix It

What causes chips and rapid dulling on Japanese knives, and how to grind out a chip and restore the edge on a whetstone.

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From the Knives and Stones workshop

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Restoring a badly sharpened Japanese knife: the cause and the fix. You probably seen one before

Fixing a Japanese Knife Chip, Cheap as Chips

Questions about this

為什麼我的日本刀會崩口或很快變鈍?要怎麼修?

幾乎所有崩口都來自硬物撞擊:骨頭、冷凍食材、陶瓷盤,或刀口敲到水槽、玻璃砧板。快速變鈍通常代表正常磨耗,或是刀口當初磨得太薄、角度不穩,又沒有完全細化。

要修復缺口,先用粗砥把整條刀口磨低,直到缺口完全消失,再逐級往上換細一點的砥石,恢復乾淨、均勻的刃面。這會削掉一點鋼材,但放著不管的缺口只會越來越糟。

我們的 K&S 建議:400 番(例如 Naniwa Chosera 400/1000/3000 階梯中的 400)負責大幅修補,之後再用 1000 以上細化。全程用 Atoma 板保持砥石平整,修好的刀口才能維持筆直。

✓ Verified by Knives and Stones · James Zhang · Reviewed 3 Jun 2026

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