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A Comb Joint (aka 'Finger Joint' or 'Box Joint') consists of a series of alternate notches and square pins of the same width which interlock when the joint is assembled.
Variations of a Comb Joint are used as Widening Joints and Scarf or Lengthening Joints. For these applications the Fingers are often tapered and the joint cut with a Router fitted with a Finger Joint Router Bit.
Twin Tenons can also be regarded as a variation of a Comb Joint and are very useful for making 'T' shaped joints (e.g. to add shelves or partitions to a cabinet).
Safety Point! All high-speed woodcutting machinery is dangerous. Routers must only be used by trained adults or trainees under direct supervision by specifically trained staff.