词条 | Combination square |
释义 |
A combination square is a tool used for multiple purposes in woodworking, stonemasonry and metalworking. It is composed of a ruler and one or more interchangeable heads that may be affixed to it. The most common head is the standard or square head which is used to lay out or check right and 45° angles.[1] Invented in 1879 by Laroy S. Starrett,[2] the combination square continues to be a commonplace tool in home workshops, construction jobsites and metalworking. Uses
In woodworking, the starting raw material is neither flat nor square, however, the end product such as a table must be flat and have corners and legs which are square. In metalworking, it is useful for a wide variety of layout and setup tasks. When used correctly, a fairly high degree of precision can be achieved. One use would be setting large items at the required angle in machine vises, where the long reach of the rule and firm, heavy base aid the process. References1. ^{{cite book |last= Campbell |first= Paul D. Q. |title= An introduction to measuration and calibration |year= 1995 |publisher= Industrial Press Inc |isbn= 978-0-8311-3060-2 }} {{Metalworking navbox|toolopen}}{{Measuring and alignment tools}}2. ^{{cite web|title=Try-Square|url=http://pdfpiw.uspto.gov/.piw?Docid=215024|website=USPTO|publisher=US Patent and Trademark Office|accessdate=13 November 2018}} 5 : Dimensional instruments|Woodworking measuring instruments|Metalworking measuring instruments|Woodworking hand tools|American inventions |
随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识,基本涵盖了大多数领域的百科知识,是一部内容自由、开放的电子版国际百科全书。