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How a mortiser drills square holes

Yes, you can drill a square hole with a round bit. Here's how: An auger-type drill bit spins inside a hollow four-sided chisel secured to the mortiser. The bit itself locks into a drill chuck inside the head of the machine. When you pull down on the mortiser's feed lever, the bit and chisel plunge simultaneously into your workpiece.

Like all drill bits, the auger bit bores a hole and ejects the chips. Meanwhile, the four sharp edges of the chisel pare the wood around the bored hole into a square shape. The auger bit removes this waste, as well, through a chip ejection slot in the chisel.


Comments (2)
subhashbawa wrote:

Where to procure the Mortiser Drills & Drill machine with attachment

9/20/2013 12:45:38 AM Report Abuse
bvz1943 wrote:

how do you sharpen the auger ?

12/8/2012 10:15:12 AM Report Abuse

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