The bits commonly used in the brace are corkscrew-shaped auger bits.
2.
Irwin had bought the rights to a solid-center auger bit from a local blacksmith.
3.
Boring machines use twist auger bits usually ranging in size from inch to 2 inches.
4.
The operator raises and lowers the auger bit into the ground by turning a steering wheel.
5.
Irwin was founded in 1885 in Martinsville, Ohio as the Irwin Auger Bit Company by Charles Irwin, a pharmacist.
6.
The diameter of auger bits for hand braces is commonly expressed by a single number, indicating the size in 16ths of an inch.
7.
Auger bits are available in sizes from 1 / 4 to 1 1 / 2 inches in increments of 1 / 16 inch.
8.
There are two types of auger bits : the single helical twist, or solid center, bit, and the double helical twist, or Jennings, bit.
9.
Similar auger bits are made with diameters from 6 mm ( 3 / 16 in ) to 30 mm ( 1 3 / 16 in ).
10.
Two styles of auger bit are commonly used in hand braces : the "'Jennings "'or Jennings-pattern bit has a self-feeding screw tip, two spurs and two radial cutting edges.
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