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Cutting The Mortise Haunch

With your mortise piece clamped securely in the vise, saw down the two gauge lines to the marked depth using a tenon saw. Make sure you cut on the insides of the gauge lines, though only marginally.

Then split the waste from the end grain using a chisel. Start part way down to test how straight the grain is; if it is approximately straight, you can split from the pencil line. If it dives noticeably, you may wish to turn around and work from the mortise side, with your chisel bevel down, of course.

Saw down the two gauge lines using the internal faces of the mortise hole as a guide
Saw down the two gauge lines using the internal faces of the mortise hole as a guide
The saw kerfs should look like a continuation from the mortise
The saw kerfs should look like a continuation from the mortise
Test the direction of the grain before splitting right on your depth line
Test the direction of the grain before splitting right on your depth line
Ensure the bottom of the haunch is even
Ensure the bottom of the haunch is even
The finished haunched mortise
The finished haunched mortise

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