Handbook of Machine Shop Management

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McGraw-Hill book Company, Incorporated, 1915 - Machine shops - 374 pages
 

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Page 273 - ... into their elements, he would make comparatively small progress in a lifetime, and at best would become a skilful guesser. It is, however, equally true that all of the work done in a given trade can be divided into a comparatively small number of elements or units, and...
Page 360 - A separator should be selected the area of whose inlet is at least as large as the area of the discharge pipe from the fan. For light buffing dusts, lint, etc., the air outlet from the top of the separator should be so large that the velocity of discharge will not exceed 300 to 480 feet per minute; a separator should be selected of which the other dimensions are proportionate. The air outlet should be provided with a proper canopy or elbow to exclude the weather but should be otherwise unobstructed....
Page 360 - The use of a trap at the junction of the hood and branch pipe is good practice, provided it is cleaned out regularly and not allowed to fill up with dust. This will catch the heavier particles and so take some wear off the fan. It will also serve to catch any nuts, pieces of tripoli...
Page 273 - No system of time study can be looked upon as a success unless it enables the time observer, after a reasonable amount of study, to predict with accuracy how long it should take a good man to do almost any job in the particular trade, or branch of a trade, to which the time student has been devoting himself.
Page 277 - Add together into various groups such combinations of elementary movements as are frequently used in the same sequence in the trade, and record and index these groups so that they can be readily found.
Page 276 - consists of two broad divisions, first, analytical work, and second, constructive work. The analytical work of time study is as follows: a Divide the work of a man performing any job into simple elementary movements. b Pick out all useless movements and discard them. c Study, one after another, just how each of several skilled workmen makes each elementary movement, and with the aid of a stop watch select the quickest and best method of making each elementary movement known in the trade.
Page 369 - Put chairs, stools and other obstructions on top of or under benches to clear the passageway. "Form line promptly with front of column facing the usual egress aisle and obey word of command from Floor Captain.
Page 277 - The analysis of a piece of work into its elements almost always reveals the fact that many of the conditions surrounding and accompanying the work are defective; for instance, that improper tools are used, that the machines used in connection with it need perfecting, that the sanitary conditions are bad, etc.
Page 356 - The spaces between fixed and moving parts at any machine, or between the latter and structures near it, leaving insufficient working clearance — in no case less than 18 inches — for any person employed thereon or near it.
Page 205 - In every particular, and to return the rejected material to the manufacturer or seller for full credit at price charged fob point of delivery specified by the purchaser. If the material Is to be replaced, a new order will be entered at prices, terms and conditions acceptable to the purchaser. In answer to the second main question, "Why are purchasing specifications needed,

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