Reply To: Chisel out of square
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Paul uses the mortise jig in some of his projects, you can see it for example in the dining chair episode 2 video (around 24 minutes in).
I agree that out of square chisels can cause the mortise to wander – when registering the chisel to the wood just before you make the chop, I find myself pushing the cutting edge to the wood. So if the chisel is out of square, I push the chisel somewhat out of square to the wood. At least, that is what I have found.. Also I can imagine that when you chop, the chisel rotates a little around the high spot.
Probably your approach of cutting a bunch of test moritses is best, to get a feeling for the chisel.
My 2 cents.
Mic
Amsterdam