Watts Brothers Tool Works

Watts Brothers Tool Works is a tool manufacturer located in Wilmerding, Pennsylvania. They are known for manufacturing drill bits that can drill square holes,^[1]^[2] including blind holes, which cannot be made with other methods such as broaching. 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.

References

^ Ragan, Sean Michael (October 6, 2009). "Drilling square holes with a Watts drill". MAKE Magazine. Retrieved February 23, 2016.
^ Watts Brothers Tool Works (1950–1951). How to drill square hexagon octagon pentagon holes. New York: Wilmerding, Pa. : The Company.
^ U.S. patent 1,241,176 Watts, Harry J.: "Drill or Boring Member", applied for November 1, 1916, granted September 25, 1917
^ Scott Smith:"Drilling Square Holes", in The Mathematics Teacher, October 1993 (Volume 86 Number 7).

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[1] Ragan, Sean Michael (October 6, 2009). "Drilling square holes with a Watts drill". MAKE Magazine. Retrieved February 23, 2016.

[2] Watts Brothers Tool Works (1950–1951). How to drill square hexagon octagon pentagon holes. New York: Wilmerding, Pa. : The Company.

[3] U.S. patent 1,241,176 Watts, Harry J.: "Drill or Boring Member", applied for November 1, 1916, granted September 25, 1917

[4] Scott Smith:"Drilling Square Holes", in The Mathematics Teacher, October 1993 (Volume 86 Number 7).

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