Reply by Loren

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Posted on Tip: Closing the Mouth on a Fixed-mouth Block Plane

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10785 posts in 4561 days

#1 posted 09-19-2020 04:57 PM

^^^ yeah, that’s it. The top bevel of 25 degrees may be the sticking point. I read some stuff about this years ago and the details got foggy.

What you’re doing is sometimes called double bevel sharpening and it’s used to make the plane cut with more of a scraping cut by making the overall bevel more obtuse. It’s useful for figured woods prone to tear out, not so much end grain where an acute sharpening angle helps. Brian Burns developed a system for sharpening these bevels and as I recall in his booklet he wrote that going lower than 12 degrees on the back was counterproductive, but I could be mistaken in that recollection.

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