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How to make Japanese sword / No.3

==> How to make a Japanese sword No.2

5.SU-NOBE(Forming the Blank)
After finishing ARA-NOBASHI, the composite steel bar is formed into the blank(SU-NOBE; rough shape of sword). This process is called SU-NOBE.


At first the front edge is cut off at a slant and BO-SHI(the cutting edge) is formed in the direction of the arrow.
The reason why BO-SHI is formed backword direction is that the layer folw of the steel should be brought together wiht the shape of BO-SHI.

Description of BO-SHI

The steel block is formed into the shape of the sword in the next stage, but the length of it is about 1 SUN(about 3cm) than final length, because the length of it grows while being formed with a hand-held hammer.
The section of SU-NOBE is rectangular, and we could know the finished width by gauging width and thickness of it.

Shaping the Blade
About 15cm section of the blank is each heated at a time in the forge, and it is hammered edge side and back side to form the shape that looks like a thin rhombus.

The shape of the sword after HI-ZUKURI is very well defined with using a file and a SEN .

This is the case of TAN-TO.


==> How to make a Japanese sword No.4