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The Harry Watts square drill bit is based on a Reuleaux triangle shape. It is used together with a guide and a particular chuck to make a square hole. [3] [4] Similarly, the company also manufactures drill bits for other angular holes such as pentagons and hexagons.
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When mounted in a special chuck which allows for the bit not having a fixed centre of rotation, it can drill a hole that is nearly square. [33] Although patented by Henry Watts in 1914, similar drills invented by others were used earlier. [9] Other Reuleaux polygons are used to drill pentagonal, hexagonal, and octagonal holes. [9] [33]
The drill sizes that are near this are letter W (0.386 in) and 25 ⁄ 64 in (0.391 in). In addition, 10 mm (0.393 in), and letter X (0.397 in) will work well, although major minus pitch by itself does not tell you this; but the 90% ± 2 pp guideline supports it.
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The internal-drive square socket for screws (as well as the corresponding triangular socket drive) had been conceived several decades before the invention of the Robertson screw and driver. An earlier patent covering both square-socket- and triangle-socket -drive wood screws, U.S. patent 161,390 , was issued to Allan Cummings of New York City ...
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The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The included angle of the spotting drill bit should be the same as, or greater than, the conventional drill bit so that the drill bit will then ...
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