“A good tool improves the way you work. A great tool improves the way you think.”Jeff Duntemann
The Uchimaru Nomi is a gouge, very much like those seen in the West
The name is composed of 3 Chinese characters (kanji): 内 pronounced “uchi “which means “ inside” or “interior,” 丸 pronounced “maru” which means “round,” and 鑿 “nomi” which means chisel.
This gouge has a blade very similar in cross section to its Western counterpart, but unlike Western gouges, it is made of laminated steel, has the combined tang and ferrule construction typical of Japanese chisels, and a crown to reinforce the handle and protect it from violent hammer blows. These are strong chisels used by carpenters to carve large-scale architectural components, and sculptors.
They come in different sizes and sweeps, although not as many as the Swiss make. Some are the size of typical oiirenomi bench chisels; others are the size of the larger heavy-duty atsunomi.
As you can see, these blades are are not hollow-ground.
The relatively hard layer of steel which forms the cutting edge is often subjected to more lateral forces when carving than their straight-bladed cousins, and are sometimes damaged as a result. Professional carvers will hold the thin cutting edge over a small candle flame to reduce the hardness over a small area to reduce this tendency. Your humble serrvant is not recommending this practice, just conveying information.
The technique used for sharpening Japanese gouges is identical to their Western counterparts. To sharpen the outside bevel, typically one will use dedicated sharpening stones with grooves worn into them that are slightly greater than or equal to the radius of the gouge. One removes the burr and polishes the inside curve by using a short stone with a radiused edge.
A piece of leather charged with polishing compound can be used to put a final polish to the bevel. One can also bend this piece of leather to polish the gouge’s inside surface. Easy peezy.
Standard sizes are 9mm, 12mm, 15mm, 18mm, 24mm, 30mm, 36mm, and 42mm.
There are also uchimaru gouges made as paring chisels, with longer blades and handles, slimmer necks, and without crowns.
If you need a gouge that that can hog a lot of wood, will take an exceptionally sharp edge and will maintain it a long time, then this is a tool you should consider.
In the next post, we will look at a different type of gouge, one you may not have seen before.
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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 10 – The Sotomaru Nomi Incannel Gouge （外丸鑿)
- The Varieties of Japanese Chisels Part 11 – The Tsuba Nomi Guard Chisel (鍔鑿）
- 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