Engineering at the british association


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ABSTRACT THE first meeting of the engineering section was held on Thursday, September 1, when, in addition to the president's address, only one paper was taken—the testing of lathe tool


steels, by Prof. Ripper. Two methods of testing lathe tools are commonly employed; in one, the object of the test is to ascertain the length of time the tool will run under given conditions


before it has to be reground; in the second, the object is to ascertain the actual cutting speed which would entirely destroy the tool in twenty minutes. Prof. Ripper was of opinion that


both these methods were of doubtful utility, the latter because, in order to determine the standard speed, so many tests had to be made. He had, therefore, devised another method, which he


called the speed-increment test. In this method the tool was started at a standard cut—at a surface speed of, say, 30 feet per minute—and the speed of cutting was then gradually increased by


equal increments of 1 foot per minute until the tool broke down. Prof. Ripper showed a number of curves to illustrate the results obtained by this method of testing, and, after the reading


of the paper, he gave a demonstration in the University laboratory. The variation of the speed was obtained by means of an electrical drive. Access through your institution Buy or subscribe


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permissions ABOUT THIS ARTICLE CITE THIS ARTICLE _Engineering at the British Association_ . _Nature_ 84, 553–554 (1910). https://doi.org/10.1038/084553a0 Download citation * Published: 01


October 1910 * Issue Date: 27 October 1910 * DOI: https://doi.org/10.1038/084553a0 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get


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