[OP]
Contributor
This tool was found in a collection of woodworking gizmos. I have no clue what it might be used for. Shown is one of three identical faces. The cross section is an equilateral triangle and the edges anPXL_20230531_184053551 (2).jpgd point are quite sharp. Any clues?
Moderator
It’s a typical deburring knife. Every machinist has one in their toolbox.
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"It's paradoxical that the idea of living a long life appeals to everyone, but the idea of getting old doesn't appeal to anyone."
Andy Rooney
Contributor
And they are deceptively sharp. Use care!
Sharp solves all manner of problems.
Exactly.......Originally Posted by Bruce Page
Lee Schierer
USNA '71
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Contributor
Some are ground from a old worn triangular file.
Bill D
Contributor
I have one of these in my bowling bag. It is used to soften/enlarge the holes in a bowling ball, as needed. Very sharp!
Contributor
This is a similar-looking tool that I purchased 20+ years ago. It is a three-sided Japanese spear-point scraper, whose proper name escapes me. It is constructed like a Japanese chisel, with a thin, hard layer of steel laminated to a softer core. Two of the three sides are flat; the working side is slightly hollowed (again, like the back of a Japanese chisel). This is useful for scraping into corners and other inaccessible areas.
20230601_203159.jpg
-- Jim
Use the right tool for the job.
Moderator
Yep, this ugly old guy has deburred a lot of hardware over the years.
"It's paradoxical that the idea of living a long life appeals to everyone, but the idea of getting old doesn't appeal to anyone."
Andy Rooney
Contributor
Look like a yari kanna (spear plane)!
Contributor
Yes, that's it, thank you! The yari kanna (also transliterated as yarri ganna) was a forerunner of the modern plane, used from 1000 AD (or earlier) to smooth surfaces produced by adzes. Mine is a small one, 220 mm (~8¾") in overall length, with a blade that is 60 mm (~2⅜") by 17 mm (11/16"); it has a nice turned boxwood handle. There are also much larger two-handed spear planes. It is usually used with the bottom almost flat on the surface, drawn at an angle towards the user, and produces fine shavings. I have also used it with a gentle push stroke, one hand on the handle, a finger or two on the blade, to scrape into tight corners.
-- Jim
Use the right tool for the job.
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