nomi　鑿

KEY WORD :　architecture / tools

A chisel. A tool used by a carpenter to bore holes in timber. It is divided broadly into two categories depending in the way it is used. The first type is the *tatakinomi 叩鑿, an extremely strong chisel fitted with a metal ring called a capping hoop, katsura かつら, at the end of the handle, and is used by hitting it with a hammer. The second type is the *tsukinomi 突鑿, which is used by gripping the handle and applying hand pressure. It does not have a capping hoop. The carpenter uses a tsukinomi for finishing a mortise hole, or for shaving a wide spliced joint that is difficult to plane. In the pre-Meiji period, carpenters had a whole set of chisels with different sized blade widths. However, with the exception of those involved in entirely traditional Japanese architecture, the art of carpentry has under gone major changes recently. With the spread of electrification and the increasing dominance of factory production, even the basic saw, plane, and chisel are gradually disappearing from the carpenter's tool box. The Takenaka 竹中 Carpentry Tools Museum in Hyougo prefecture has reconstructed models of carpentry tools thought to have been in use in the Kofun period. They are similar in shape and size to the tools which carpenters use today.

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