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Mortiser and Biscuit Joiner

Cut two half-circles into two pieces of wood and slide a biscuit into them to make a strong joint. Learn how with these step-by-step instructions.

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biscuit joiner cuts half circles into wood
  • Time

    Under Half Day

  • Price Range

    $100 - $250

  • Difficulty



Step 1: Cut the Biscuits

Biscuits are sized in increments of 10. Adjust the biscuit joiner for the biscuit size you are using. The adjustment changes how far the blade comes out and cuts. The fence on the biscuit joiner can be adjusted to fit the width of the wood being cut. Cut biscuits into the center of the thickness of the wood to ensure that they line up properly.

Step 2: Cut the Wood

Line up the two pieces and mark the location where the slot will be cut in each.
Put one piece up to the joiner with the line you marked underneath the center locator.

Make the cut. Repeat steps two and three for the second piece.

mark location where slot will be cut

Step 3: Clamp the Joint

Put glue inside each cut as well as on the biscuit.

Next, slide the biscuit into one of the slots (Image 1).

Slide the slot on the other piece of wood around the exposed biscuit (Image 2).

Clamp the pieces together. When the glue is dry, unclamp them to reveal a strong joint.

Tip: By making a half-circle cut into the end of one piece and pairing it to a side piece with a biscuit, you can build a frame. Biscuits can also be used with miter cuts.