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Download pdf Official Proceedings Volume 21-22
Download pdf Official Proceedings Volume 21-22

Official Proceedings Volume 21-22 by United States General Accounting Office
Official Proceedings Volume 21-22
Author: United States General Accounting Office
Number of Pages: 312 pages
Published Date: 15 Jan 2013
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781234165086
File size: 41 Mb
Download Link: Official Proceedings Volume 21-22

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: ...or in other words, when the heat had been abstracted from the steel. The cooling quality of the oil was then determined, using water as unity. The figures given represent an average of three tests. To properly determine the grade of oil which was used, specific gravity at 60 degrees Fahrenheit, viscosity at 150 degrees Fahrenheit, and flash point were determined. DETERMINATIONS OF TEMPERING QUALITIES OF OILS HARDNESS A tool properly treated has great mineral hardness; it is brittle; and to develop its highest efficiency it is necessary to again heat it to such a temperature (drawing the temper) to develop that condition which gives the tool the proper combination of hardness and toughness for the work at hand. In passing, I believe a few words on the subject of hardness would be in order. The quality known as hardness has never been clearly or satisfactorily defined. A discussion of this quality might lead us to great lengths. The quality and quantity of hardness best suited to any class of work is governed by the conditions surrounding the service of those tools. As set forth by Mr. Bradley Stoughton in the discussion foEowing Mr. Shore's paper as given before the American Society of Testing Materials, on Hardness Testing Machines, there will be found the following: 1st. Cutting hardness, such as required in machine tools. 2nd. Abrasion or wearing hardness. 3rd. Resistance to penetration, such as desired in armor plate. 4th. Resiliency or elasticity. 5th. Brittleness. These conditions of service lead us to materials differing in nature from the work we have in hand. What we require is sufficient hardness for our service coupled with the required strength to operate. There are several instruments that may be used successfully in...

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