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Bit and chisel offset
The mortiser's square hollow chisel and the drill bit inside it work in tandem: The bit removes most of the waste while the chisel pares away the edges and corners. Proper spacing between the chisel tips and bit ensures the bit clears a path for the chisel. Here's how to install them: Slide the chisel (with the bit inside) into the mortiser collar, inserting a dime as shown right to keep it from fully seating, and snug the setscrew. Next, raise the drill bit into the chuck until it seats against the chisel, and tighten the chuck. Finally, loosen the setscrew, remove the dime, and seat the chisel tightly against the collar while simultaneously squaring it to the mortiser fence, as shown below right. Tighten the setscrew, and you're ready to cut.
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