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chopping a mortise

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This topic contains 8 replies, has 5 voices, and was last updated by  neil grayson 7 months, 2 weeks ago.

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  • 19 March 2019 at 7:16 pm #555616

    neil grayson
    Participant

    HI,

    Not sure if this is in the right forum or not but I can but try.

    OK so I am slightly younger than Paul and the last real woodwork I did was at school a long time ago. I actually love it and now I am retired getting back into it.

    I am building a Paul Sellers workbench and I am finding that as I chop the mortises the chisel ( Lidl prepared the Paul Sellers way) twists on me no matter how tightly I grip it.

    Is it just me? Am I weak or could it be that the chisel bevel is slightly off and that’s the cause?

    Any one else been through this or got any suggestions?
    Neil

    19 March 2019 at 9:17 pm #555617

    neil grayson
    Participant

    Please ignore this. Although I searched for previous entries on mortises on the forum I found none. When I googled it tooke me to a page on this forum. Go Figure.

    Anyway I have my answer.

    19 March 2019 at 9:48 pm #555618

    Sven-Olof Jansson
    Participant

    With or without a honing guide, a skew bevel or edge easily occurs. You have probably noticed that as the edge is hammered down the bevel pushes the iron along the mortice breaking the “chop” free. A skew bevel will inevitably twist the chisel during that push, no matter what.

    Being at best an acceptably mediocre woodworker, I find mortising easier with a guide and a flat side mortise chisel that required no preparation before use. Won’t work for mortices >½” though.

    /Sven-Olof

    PS
    Sorry Neil, didn’t see your 2nd message before hitting submint

    Sven-Olof Jansson
    London, UK; Cambridge, MA

    • This reply was modified 7 months, 3 weeks ago by  Sven-Olof Jansson. Reason: Addition
    21 March 2019 at 10:49 am #555632

    Benoît Van Noten
    Participant

    If the chisel is not sharp enough, it will follow the path of least resistance. Pine in particular is far from isotropic.

    21 March 2019 at 1:58 pm #555633

    deanbecker
    Participant

    Take smaller bites. They are easier to resist if they twist

    21 March 2019 at 5:51 pm #555635

    neil grayson
    Participant

    Many thanks for the replies.

    I will be checking all of them to try to better understand my technique.

    23 March 2019 at 3:11 pm #555660

    Benoît Van Noten
    Participant

    “smaller bites”
    That is a more practical answer than mine.
    P. S. has an excellent video where he is chopping mortises behind a glass.
    Capital video in my opinion.

    29 March 2019 at 4:52 pm #555704

    Mic van Reijen
    Participant

    When I googled it tooke me to a page on this forum. Go Figure.

    Anyway I have my answer.

    Out of interest, what page did you find?

    Mic

    30 March 2019 at 9:23 pm #555707

    neil grayson
    Participant

    Sorry for the late reply. I had to find it again.

    Here you go.

    https://woodworkingmasterclasses.com/discussions/topic/what-causes-chisels-to-twist-when-chopping-mortises/

    Neil

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