Reply by Lumber2Sawdust

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Posted on hand cut mortise help

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139 posts in 2887 days

#1 posted 04-12-2012 03:13 PM

If you have 4/4 material finished at 3/4”, you should have 1/4” on each side of the mortise. That is enough material.

You can prevent a lot of problems by clamping the sides of the board while mortising. I use a hand screw clamp, parallel to the board, clamping it from the end. If you don’t use hand screws, just clamp a block of wood on either side of the board to support it. This helps prevent the pressure of mortising from blowing out. If you are working near the end of a board, be careful not to pry the chips out against the side nearest the end. That usually ends up in blowing out the wood between the mortise and the end.

Good luck

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