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Old 9th June 2014, 06:53 PM   #4
Hotspur
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Join Date: Jul 2009
Location: Nipmuc USA
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The spoon type with a lead screw, as the one you show, was often used in large mortise and tenon work. The auger removing a lot of the pocket and then chisels to square the mortise. The T handle and other pointy blade next to that in the linked picture are of your type.

Smaller modern mortising drills have a twist drill within a square tube acting as a four sided chisel. Large scale post&beam work is still often done the old way with a spoon auger. With wooden boat building, the round pocket in the beam, with pegs holding the planks.

Cheers

GC
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