What’s the Deal with Back Bevels and Domed Tops on Mortising Chisels?

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Asked By CuriousToolHunter92 On

Hey everyone! I picked up a vintage 1/2" socketed mortising chisel at an antique mall for just $5, and I'm curious about a couple of its features. It has a slight back bevel and a domed top, which I've never really encountered before on a mortising chisel. Is this typical? The chisel has some dings and shallow tool marks that give it a forged look. I did some digging online and noticed that it might be connected to Pexto tools, as it has a stamp that reads "No 1 EX." I just want to know what you think about those features and if they affect the tool's performance!

4 Answers

Answered By TechyToolEnthusiast On

I’d definitely love to see pictures of your chisel! Just to clarify, the back bevel you mentioned shouldn’t pose much of a problem since it's not a paring chisel.

Answered By ChiselGuru87 On

That chisel sounds more like a carpenter's tool than a sash mortise chisel, especially given the width and condition. The back bevel isn’t crucial for your use; it's mostly chatter about needing a perfectly flat back. Just repair any nicks, sharpen it up, and start using it!

WoodWorker101 -

Exactly! Unless that back bevel is extreme, you shouldn't worry too much about it affecting your cuts.

Answered By OldTimeToolFan On

My 1/4" mortise chisel has a banana shape too, but it does the job for removing waste! If it’s not causing you issues, just roll with it!

Answered By CraftyCarpenter42 On

I think I've seen chisels with similar features being called London pattern sash mortise chisels. The domed top is usually just a semi-circular shape, which makes it easier for certain cuts. If it doesn’t bother you, then it should work just fine!

UserWithAnIdea -

Right? A picture would help others understand what you're working with!

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