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Arthur W Judge : Engineering Workshop Practice

Caxton Publishing, 1951

1951 Volume I. Volume II also available. BOOK in black cloth hardcovers, bumping to corners & spine ends, gilt lettering to spine. PAGES tanned but clean, flat & tight, some spotting & finger marks to margins but neither interfere with text, lovely old book. Book Extract; although the whole trend of modern engineering progress is towardsthe elimination of hand labour by machinery in the production of metalarticles, nevertheless, there still is-and always will be-a certain amountof hand work necessary in fabricating many engineering parts. Thus itwill always be necessary to make many of the master dies and keypatterns by hand; whilst in the repairs, overhauls, and adjustments ofmachinery and engines, the use of hand tools is indispensable.Emergency repairs and the making of specimen articles or patternsfor mass-production work, dies, templates, and similar single specimensrequire the use of hand-operated tools and a knowledge of metal crafts-manship on the part of the operator. There are innumerable instancesof single articles being required in the engineering workshop, whilst, inconnection with the repair of plant and machinery, hand methods andthe mechanical skill of the operator become essential.Every engineer should therefore not only be conversant with thevarious types of metal-manipulating or cutting hand tools but shouldbe proficient in their use. This, of. course, is one of the objects of theapprenticeship system, for the beginner has to serve a period of four,five, or six years in order to become thoroughly skilled in the useof hand tools as well as machines. The ability to handle tools, suchas the chisel, file, and scraper, efficiently, enables the mechanic to under-take all kinds of ordinary and special work and to make simple orcomplicated articles accurately by hand. In the case of tool makingand experimental work this is a necessary qualification on the partof the mechanic., 4to - over 9¾" - 12" tall, Good

Arthur W Judge : Engineering Workshop Practice

Caxton Publishing, 1951

1951 Volume II. Volume I also available. BOOK in black cloth hardcovers, bumping to corners, edges & spine ends, gilt lettering to spine. PAGES tanned but clean, flat & tight, some spotting & finger marks to margins but neither interfere with text, lovely old book. Book Extract; Principle of Surface Grinding.-Hitherto we have dealt with variousmethods of machining metals based upon the use of special designs ofsteel or tipped-steel cutting tools, multiple-edge cutters, and similartools. In all cases each cutting tool or unit was given a definite cutting-edge angle, rake, clearance, etc.There is, however, another method of removing surplus metal inroughing and finishing operations, depending upon the principle ofemploying an extremely large number of cutting teeth of varied shapesoperating at a relatively high speed, but removing a very small amountof metal per revolution. In most cases there are hundreds of thousandsof artificial or natural abrasive " teeth," operating at a surface speed offrom 4,000 feet to 6,000 feet per minute as compared with the single cutting" tooth " of a lathe or planing tool working at 50 feet to 200 feet perminute. Each abrasive tooth removes only a minute quantity of metal,but the effect of employing an extremely large number at a high cuttingspeed results in a relatively large total quantity of metal being removed.Grinding Materials.-The abrasive particles used in various grindingprocesses include sand, emery, carborundum (a compound of carbon andsilicon fused in an electric furnace to form carbon silicide), corundum(fused or crystalline alumina), diamond dust, and other artificial abra-sives, while substances of a finer nature are employed for finishingoperations-pumice, tripoli, rottenstone, rouge, whiting, and chalk.When used for grinding wheels, hones, or abrasive slips, the former, 4to - over 9¾" - 12" tall, Good

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