This small diy blade is approximately a 2/3 – 3/4 scale version of the Tools for Satoyama Forest Kotanto.
The temper of this high carbon steel blade has been left very hard in order to hold a keen edge for tasks such as wood carving and fine work. This particular combination of steel and heat treatment is well suited to users who require a good edge and are willing to take care of it.
The clay tempered blade was hand forged in a charcoal fire and still bears the hammer marks, original file teeth, and a very interesting texture from the deep rust on the surface of the file. It has been left as tempered and still has about 1mm of material left to work with in shaping the edge geometry to suit the end use. The forged bevels are approximately 8-10 degrees so a secondary bevel or a rolled bevel can be added without losing all of the forged finish. This final edge work should only be done by hand on a waterstone or diamond stone to avoid damaging the temper.
The tang is constructed in a similar manner to a Japanese tanto requiring only a single bamboo peg to hold the knife assembly together. In addition to the sense of beautiful simplicity, this design allows the knife to be taken apart for cleaning, polishing, detailed cutting tasks, or major resharpening work.
The double tapered tang is designed to be mounted in the takedown style of nihonto, with a single removable bamboo peg, but has no hole yet and can be drilled to meet the final configuration as the tang area is not hardened. The blade is 3.25″ long and the overall length to the tip of the tang is just under 6″. The spine at the munemachi is about 3mm thick.
長さ/刃長 Nagasa (blade length): 83mm
重ね/元重 Motokasane (spine thickness): 3mm
元幅 Motohaba (blade width): 15mm
反り Sori (curve): slight uchizori (reverse curve)
中心/茎 Nakago (tang length): 69mm
形 Katachi (geometry): hira-zukuri, slight maru-mune (rounded)
中心/茎 Nakago (tang): futsu, kuri-jiri, no mekugi-ana
銘 Mei (signature): mumei (unsigned)
拵 Koshirae (mounting): none
Materials: reclaimed file steel