| 词条 | Watts Brothers Tool Works |
| 释义 |
| name = Watts Brothers Tool Works | hq_location_city = Wilmerding, Pennsylvania | hq_location_country = United States }} 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, and is used together with a guide and a special chuck to make a square hole.[3][4] Similarly, the company also manufactures drill bits for other angular holes such as pentagons and hexagons. References1. ^{{cite web | url = http://makezine.com/2009/10/06/drilling-square-holes-with-a-watts/ | title = Drilling square holes with a Watts drill | last = Ragan | first = Sean Michael | date = October 6, 2009 | publisher = MAKE Magazine | access-date = February 23, 2016 }} {{tool-stub}}2. ^{{cite book|author=Watts Brothers Tool Works|title=How to drill square hexagon octagon pentagon holes|publisher=Wilmerding, Pa. : The Company |location = New York|year=1950–1951}} 3. ^{{US patent|src=uspto|1241176}} 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). 1 : Tool manufacturing companies of the United States |
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