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to-ishi@“uΞ
KEY WORD :@architecture / tools
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A whetstone, grinder, or grindstone. A tool used to sharpen the blade of a plane or chisel. Carpenters used a set of ranging whetstones from very coarse, 800 grit to an unbelievably fine 6000 grit, a coarse, rough whet stones were called arato r“u, the whet stones midway between rough and smooth were called nakato ’†“u, and a very smooth grinding stone was called awasedo ‡“u. A blade was sharpened in stages: first sharpened with the arato, then the nakato, and finally the awaseto was used to achieve a fine cutting edge. A flat-surfaced, metal whetstone called kanato-ishi ‹ΰ“uΞ, was is used to grind down the back of a blade, and grinding was easier when the kanato was sprinkled with a small amount of emery powder.
The arato was made of sandstone, mainly from Oomura ‘ε‘Ί in Kyuushuu ‹γB, the nakato was made of shale, taken from Amakusa “V‘ in Kyuushuu, and the awaseto was slate from Takao ‚—Y in Kyoto. However, now that sources of naturally occurring stone have declined, most whetstones are man-made. Special rounded whetstones are also produced to sharpen tools with curved blades like the *marunomi ŠΫθw and the *maruganna ŠΫηξ.
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