router bits

Router bits that hold two indexable carbide inserts on opposite sides of an 8 mm shank, in the order they are used: each bit cuts a board that the bits before it have already been right through. A straight bit with two reversible rectangular inserts first cuts out the middle of the round dovetail groove, as wide as its opening and as deep. The V-groove bit takes special inserts ground to its included angle, from 30° to 150°: at 90° its flanks meet the surface of the board at 45°, and a short edge at the tip of each insert cuts a narrow flat in the floor. The 35° corner bit takes standard ISO V inserts (VCGT 1103) and cuts from the floor of the groove into the narrow corner under the quadrant: its flank runs parallel to the quadrant where that is at 35°, 0.25 mm in front of it, and its neck passes through the opening. The round bit takes a special insert whose flank is a full quadrant of 16 mm radius: it meets the floor tangentially and ends upright at the surface, so the bit cuts as deep as the radius. Pick a bit and its inserts, set the angle, diameter and depth, and animate the cut through the board, or capture all the operations one after another in one video.