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Lamello Top biscuit joiner with blade extended. Edges of 16mm Medium-density fibreboard with a #0 biscuit, set up to make a right angle joint. A biscuit joiner (or sometimes plate joiner) is a woodworking tool used to join two pieces of wood together. A biscuit joiner uses a small circular saw blade to cut a crescent-shaped hole (called the mouth) in the opposite edges of two pieces of wood or wood composite panels. An oval-shaped, highly dried and compressed wooden biscuit (beech or particle wood) is covered with glue, or glue is applied in the slot.
1 Choose an appropriate sized biscuit for the dimension of the lumber you are using. 2  Be sure to have the fence of the biscuit joiner flat to ensure proper fitting of the two joining pieces. 3  Failure to do so will result in an uneven surface of the two pieces of joined wood.. Mark the location of the biscuits to be glued between the boards. Generally, the distance between biscuits will determine how strong the finished plank will be, and thinner lumber will hold better if the spacing is kept to a minimum.