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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.
A plate joiner, often referred to as a biscuit cutter, is a tool that has little use beyond the one task that it is designed to complete, but it performs that task so incredibly well, that it is one of the few single-task woodworking tools that I'd recommend for every workshop.n the other hand, a biscuit cutter or plate joiner eliminates these concerns. The blade, which spins at speeds up to 10,000 RPM, is completely housed within the guard of the saw until it is plunged into the stock.