Banshu Miki Uchihamono



Features of Miki Hardware Chisel

It is an absolutely necessary tool in Japanese wooden architecture and was often used in the Nara period.
In Miki, it is recorded that there was a chisel smith during the Bunsei era (around 1800).
All 14 manufacturing processes such as forge welding of steel and iron-forging-quenching-mud coating-shaping are done by the reliable skill of long-time craftsmen.
It can be said that it is utilized by reliable tools.

Manufacturing process

1Raw materials

Hard and soft steels preparation cutting each one to the required size.

2Forge welding

Joinning soft and hard steel by appling a bonding agent to iron and heat it to a high temperature (1000 to 1100℃), and hit those with a mallet to bond them.

3Forging (forging)

Heat the steel to heat (800-900℃) and forge it with a mallet to form a shape.


The structure of steel disordered by forge welding and forging is placed in a furnace heated to 750℃ and slowly cooled to spheroidize the structure.

5Smoothing shape

Make the back while hitting with a mallet.


Shape it with a grinder until get required shape.

7Strain removal

It is a work to straighten the distortion caused by the heat on a wooden anvil.

8Insert name

Engrave a trademark, etc.

9Mud coating

Apply mud (abrasive powder) so that the quenching is evenly performed.


Work to harden steel by heating it to 780 to 800℃, soaking it in water and quenching it.

11Distortion removal

Correct the distortion caused by quenching.


Heat to 180℃ to make the steel sticky.

13Distortion removal

Remove the distortion of the finish.

14Back finish

Finish the back by polishing.

15With a blade

Attach a blade using a rough whetstone, a medium whetstone, and a finishing whetstone.


Attach a wooden handle such as an oak.


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