Flat to Convex and Final Rough Sharpening on 400-800 Grit - part 2 | ハマグリ刃の研ぎ方

Part 1
   • Key Points To Start Rough Surface Sha...  
Part 3
   • On the way to a kasumi finish 3000 Gr...  

Many of you may want to know about Convex, also known as Hamaguri or Clam Shape.
Generally, the convex edge is shaped entirely edge roundly, from Kurouchi line but this time we are sharpening it Flat To Convex which means the blade road is flat and rounded only the edge.
Why do we use that method and how is it done? Why does it need the flat on the blade road?
The technics and eyes; Ivan learned from Sakai Japan, we hope you will deepen your sharpening knowledge more through the video.


包丁研ぎ歴25年、現在は日本三代包丁産地である大阪府堺市で包丁会社に勤めているカナダ人です。

日本でハマグリ刃と呼ばれるコンベックスの研ぎをしました。鍛治師である真崎氏の素晴らしい包丁の形を残すため、今回は刃先だけハマグリ刃の仕上を採用しています。

今回の研ぎでは、眞崎直樹氏の黒打牛刀を使わせていただきました。貴重な包丁を研がせていただく機会をいただいた、包丁コレクターの友人には感謝しております。


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Hello, we, Ivan and Yuka have a unique experience of Japan through our business and life such as rich Japanese culture, exquisite crafts, breathtaking natural landscapes, beautiful foods and exciting travel, we share what we feel through our business and our lives. By sharing such our experiences, we hope that you will enjoy through our videos!



00:00 - 400 - 800 Grit, and Convex Sharpening
00:40 - What is Convex Edge?
01:27 - Sharpener Morihiro's Technic on Hamaguri Edge
01:47 - Two Key Point for Checking Convex Edge
02:52 - Konosuke and Morihiro
04:49 - Tamahagane Gyuto by Swordsmith
05:39 - Chose Flat to Convex on Mazaki's Gyuto
06:49 - Class - Convex is Fully Clam Shape
07:34 - Class - Why Chose Flat to Convex
10:02 - Class - Flat to Convex on 200 Grit
10:35 - Class - Flat to Convex on 400 Grit
11:27 - Class - Flat to Convex on 800 Grit
13:16 - Changing the Scrach Pattern on Each Grit
15:37 - Sharpening on 400 Grit
17:00 - Check the Angle on Degital Protacter
17:59 - Learned from Morihiro
19:10 - Check Point Before Moving onto the 800 Grit
21:03 - Poit Sharpening on 800 Grit
21:53 - Class - Flat to Convex on 800 Grit
22:58 - Sharpening on 800 Grit
24:31 - What to Check Before Moving onto the next Stone