Axe Sharpening Gauge

I was working on an axe, and wondered at what angle to sharpen it. Here's a modern take on an old-fashioned jig
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updated November 5, 2022

Description

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I was modifying a hardware-store hatchet and wanted to profile it for cutting rather than splitting. This left me wondering what was the proper range of angles.

A bit of googling took me to: https://www.bladeforums.com/threads/sooo-whats-the-proper-edge-angle.1342535/ which has two reference images. One of them resulted in a very weird profile (had an odd concave section near the tip), so this is “Hardwood” variant of this sheet:

Original source of this diagram is: https://www.fao.org/3/t0129e/t0129e.pdf

 

Well, time to go sharpen my hatchet….

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