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Dan Cameron
05-31-2023, 3:35 PM
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 an502117d point are quite sharp. Any clues?
Bruce Page
05-31-2023, 3:39 PM
It’s a typical deburring knife. Every machinist has one in their toolbox.
Rob Luter
05-31-2023, 4:14 PM
And they are deceptively sharp. Use care!
Lee Schierer
05-31-2023, 6:14 PM
It’s a typical deburring knife. Every machinist has one in their toolbox.

Exactly.......
Bill Dufour
06-01-2023, 1:41 AM
Some are ground from a old worn triangular file.
Bill D
Derek Meyer
06-01-2023, 6:48 PM
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!
Jim Morgan
06-01-2023, 8:40 PM
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.

502180
Bruce Page
06-01-2023, 10:26 PM
Some are ground from a old worn triangular file.
Bill D

Yep, this ugly old guy has deburred a lot of hardware over the years.
Justin Kwong
06-02-2023, 8:36 AM
Look like a yari kanna (spear plane)!
Jim Morgan
06-02-2023, 12:06 PM
Look like a yari kanna (spear plane)!

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.