Handbook of Machine Shop Management

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

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Page 334 - 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 341 - 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 250 - 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. d Describe, record and index each elementary movement, with its proper time, so that it can be quickly found...
Page 250 - 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 334 - The withdrawal of air from a room by an exhaust system naturally tends to create a slight vacuum and for this reason inlets for air at least equal to...
Page 341 - Don't run. Don't lag behind, breaking up columns. Don't scream or make unnecessary noise. Don't laugh or talk. Don't cause confusion. Don't remain in toilet or dressing room. Don't return for your clothing. Don't try to use elevators. Don't attempt to leave place in line until you return to the building. Don't attempt to leave building except in accordance with exit drill regulations.
Page 334 - Rule 705. — Every branch pipe shall enter the main pipe at top or side and at an angle not exceeding forty-five (45) degrees; it shall incline in the direction of the air flow at junction with the main. Branch pipes shall not project into the main. Every branch pipe shall lead out of the hood as nearly as possible at the point where the dust will naturally be thrown into it by the wheel. In the case of undershot wheels (ie, when the top of the wheel runs toward the operator), the main suction pipe...
Page 334 - Recommendations for the size of the cyclone separator or dust collector are hard to give, as the separator must be proportioned to suit operating conditions, light dusts requiring a larger separator than heavy dusts. The following table, reproduced from the catalog of a prominent separator manufacturer, gives dimensions of separators stated to be suitable for metallic dusts and wood shavings. A separator should be selected the area of whose inlet is at...
Page 334 - Or, a space may be left beyond the fan so that the fan may be moved along and the main extended when it is actually decided to install additional wheels, provided the fan is of sufficient size to still comply with these specifications after the additional branches are added.
Page 333 - Emery wheel and buffing wheel exhaust systems should be kept separate, owing to danger of sparks from the former setting fire to the lint dust from the latter, if both are drawn into the same suction main.

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