Material

木について

自身で初めて伐採したのは樫の大木でした…
ものの数分で力なく倒れる大木…暗い森が一瞬のうちに開けて光が射し込んだことを今でも鮮明に覚えています。
数十年、数百年を生きた命を大切に使います。
当工房では主に国産材を使用しております。針葉樹、広葉樹、間伐材、古材等
様々な木々たちを余すことなく丁寧に使っていきたいと思っております。

Wood

The first tree I ever felled myself was a large Japanese Kashi Oak. Within a matter of moments the large tree fell effortlessly to the ground, and the dark forest was immediately flooded with light beaming through the opened canopy. To this day, I can recall this memory very clearly.

Such trees have existed in the forest for several decades — or at times, centuries — and as such we endeavour to use the material their lives have provided in a respectful manner.

In our workshop we mainly use native Japanese woods. We use a combination of both softwoods and hardwoods, which are either sustainably harvested or obtained from salvaged material. We strive to use a variety of wood with great care, treating the life of each unique tree preciously.

刃物について

日本は地下資源が乏しかったため貴重な硬い鉄 鋼(ハガネ) と柔らかい鉄 地金(ジガネ) を熱と圧力で接合する「鍛接」という技術が発達してきました。
また槌で鍛錬して分子を細かくする「鍛造」にも適しているため材料の節約だけでなく刃物の性能、形状も独自の進化を果たしました。
この工程を経て出来上がったものが「打ち刃物」と呼ばれています。
昔は柔らかい杉や檜を加工することがほとんどでしたが現在は楢や樺など硬い木、それも木口と呼ばれる木の断面を削ることも多くなりました。
従来の「打ち刃物」だけでは対応できなくなっています。
さらに手工具の需要が低迷、鍛冶屋さんの人材不足、コスト面からみても良質な打ち刃物の仕入れが困難な状況です。

Blades

As Japan is scarce in mineral resources, forge welding techniques — whereby the precious hard iron steel, hagané, is welded onto the soft steel, jigané, by heating them to a high temperature and ham-mering them together — were widely practised in the production of blades. As a result, these forge welding techniques have become highly advanced in the continued efforts to use these scarce mate-rials sparingly. Simultaneously, these blades are suited for forging techniques that have also con-tributed to the evolution of the blade’s form and performance. A blade produced from this process is called an uchi-hamono (wrought iron steel blade).

In the past, woodworking tools were more commonly used on softwoods such as Japanese Cedar or Hinoki Cypress. However, recently we may find ourselves shaving the end-grain of hardwoods such as Japanese Oak or Birch, and the evolution of the uchi-hamono is less suited for these modern purposes. Furthermore, with the demand for traditional hand tools dwindling, along with the short-age of blacksmiths — good quality, cost-effective uchi-hamono have become a rarity.

パウダーメタル

当工房では主に「パウダーメタル」といわれる鋼材を使っております。
パウダーメタルとは粉末冶金法(ふんまつやきんほう)という特殊な製鋼技術でつくられています。
粉末状にした鋼(ハガネ)を焼き固めることで均一な組織になり、なおかつ分子も微細なので非常に鋭い切れ味を発揮します。
最大の特徴はその硬度…鋼材の硬度を表すHRC(ロックウェル硬さ)は最大でHRC67(ZDP-189のみ)という高硬度をマークしています(従来の刃物がHRC60~62)
一般に硬いと砥ぎにくいと言われていますが砥石の性能が上がったおかげでこの問題もクリアしました。
錆に強いため水分が多いグリーンウッドワークにも木口削りが多いスプーンづくりにも最適な鋼材となっております。

ZDP-189 〈HRC67〉
日立金属が開発したパウダーメタル。非常に硬い鋼材で高い耐久性が特徴です。高硬度のため高性能な砥石が不可欠です。
こちらはプロの方にお勧めしております。

SPG2 〈HRC62〉
武生特殊鋼が開発した「粉末ステンレスハイス」です。切れ味、耐久性、砥ぎやすさのバランスが良く錆につよい鋼材です。ビギナーの方にお勧めの刃物です。

Powdered Metal

In our workshop, we predominantly use powdered metal for our tool blades.

Powdered metal is made using a production technology called funmatsu-yakinhō (powder metallur-gy). Sintering the powdered metal into a unified material from its fine molecules provides the steel with an extremely sharp cutting edge.

The most definitive characteristic is its hardness. Measured on the Rockwell scale, a maximum strength of HRD 67 can be achieved (for the ZDP-189) — where a conventional blade typically has a strength of around HRC 60–62.

Although harder blades have historically made for more difficult sharpening, due to the recent im-provement in the quality of sharpening stones this is no longer a problem. These steels are also more resistant to rust, and it is therefore an ideal material for green woodworking, working with unsea-soned wood, as well as for crafting spoons which requires a large amount of end-grain shaping.

ZDP-189 〈HRC67〉

A powdered steel developed by Hitachi Metals. It is an extremely hard steel with high durability. Due to its high strength, a high-performing sharpening stone is essential. It is a blade recommended for professionals.

SPG2 〈HRC62〉

A powdered stainless high-speed steel developed by Takefu Special Steel Co. The steel material has a good balance of sharpness, durability and ease in sharpening, and is also resistant to rust. It is a blade recommended for beginners.