A sharpening jig is a tool used to hold a woodworking blade at a fixed, repeatable angle while it is sharpened. Many woodworking tools carry a steel blade ground to a fine edge, and that edge is formed where a bevel meets the blade's flat face; the bevel is first shaped, usually by grinding, and then refined by honing until the edge is sharp enough for clean work. A jig holds the blade steady at the correct bevel angle through this process, which is difficult to keep consistent by hand alone.
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Source Sharpening jig (Wikipedia)
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1. Sharpening jig (Wikipedia)
Lead section
The purpose of the sharpening jig is to hold the blade or tool at the desired angle while grinding or honing the bevel.
Lead section, still made today
There are many styles of jig available commercially.
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