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This blog is written by aerialcopper | 2 entries so far

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Momi-Giri #2: Yotsume-kiri (four sided) bit

05-26-2018 08:49 PM by aerialcopper | 0 comments »

Here is a simple method for making a “yotsume-kiri”, a gimlet bit for bamboo/wooden nails. For this gimlet, I wanted to use the fewest tools possible. You can see my method for making the handle here. I used annealed 1/8” square 1095 steel key stock which cost $1.08 from McMaster Carr. Any medium or high carbon steel will make a nice bit: O1, W1, A2, 4142 all seem to be available and economical in small sizes. Even mild steel (nails, spokes, etc) would probably be fine for this style of bit, but would probably not hold up well in other styles. Here is my fixture for indexing and holding the key stock while filing: The tapered point needed a wedge (na...

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