“The beginning of wisdom is to call things by their proper name.”

Confucius

The “Tsuba” in Tsuba Nomi is the Chinese character 鍔 which means “guard” as in a sword or knife guard.

Two nubs attached to opposing sides of the blade just below the handle look like the guard for a knife or sword. This chisel is driven with a hammer to quickly create a pilot hole for nails or screws. The blade becomes tightly wedged into the wood, but by striking up on these projections with a steel hammer, the blade can be extracted.

This unique chisel comes with blades with round, square, or rectangular cross-sections.

Square and rectangular blades usually have a chisel-point beveled on two sides, but sometimes are beveled on just one side. Round blades may have simple pointed ends, but sometimes they have short triple tines to drive the crushed wood fibers into the hole.

While this chisel severs the wood fibres, unlike an auger, drill, or gimlet, it does not remove material from the hole. The ends of the severed fibers are angled down into the hole, and over time and exposure to humidity and water, will partially swell back to their original shape locking nails in tightly.

This chisel is still used in the wooden shipbuilding industry, but other than that sees very little practical use nowadays. Your humble servant owns one but has never used it in anger.

YMHOS

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Links to Other Posts in this Series

• The Varieties of Japanese Chisels Part 1 – The Main Categories
• The Varieties of Japanese Chisels Part 2 – The Mentori Oiirenomi (面取追入鑿）
• The Varieties of Japanese Chisels Part 3 – The Shinogi Oiirenomi (鎬追入鑿）
• The Varieties of Japanese Chisels Part 4 – Kakuuchi Oiirenomi (角打追入鑿）
• The Varieties of Japanese Chisels Part 5 – High-Speed Steel Oiirenomi (HSS 追入鑿）
• The Varieties of Japanese Chisels Part 6 – The Mortise Chisel (Mukomachi Nomi 向待鑿)
• The Varieties of Japanese Chisels Part 7 – The Nihon Mukomachi Nomi (二本向待鑿)
• The Varieties of Japanese Chisels Part 8 – The Atsunomi （厚鑿）
• The Varieties of Japanese Chisels Part 9 – The Uchimaru Nomi Gouge （内丸鑿）
• The Varieties of Japanese Chisels Part 10 – The Sotomaru Nomi Incannel Gouge （外丸鑿)
• The Varieties of Japanese Chisels Part 12 – The Usunomi Paring Chisel (薄鑿)
• The Varieties of Japanese Chisels Part 13 – The Shinogi Usunomi 鎬薄鑿 Paring Chisel
• The Varieties of Japanese Chisels Part 14 – Kote Nomi (鏝鑿Trowel Chisel)
• The Varieties of Japanese Chisels Part 15 – Ootsuki Nomi 大突き鑿
• The Varieties of Japanese Chisels Part 16 – High-speed Steel Atsunomi
• The Varieties of Japanese Chisels Part 17 – Sokozarai Chisel
• The Varieties of Japanese Chisels Part 18 – The Hantataki Chisel