The boys' book of engine-building; (1918) (14783473362)

Identifier: boysbookofengine00coll (find matches)

Title: The boys' book of engine-building;

Year: 1918 (1910s)

Authors: Collins, A. Frederick (Archie Frederick), 1869-

Subjects: Steam-engines

Publisher: Boston, Small, Maynard and company

Contributing Library: The Library of Congress

Digitizing Sponsor: The Library of Congress

Text Appearing Before Image:

standards, two on each side; have eachpair of holes Wig inch apart and % inch from theother as shown in A and B. Tap out these holesand screw the standards tight to the bed. Set the shaft of the wheel between the bear-ing screws and drill a %2-inch hole through thebed at the places where the angle plates of thewheel case rests on it; thread them with an 8-32tap and screw the angle plates down to the bed.This completes the steam turbine proper and,when done, it will look like Fig. 22. The Reduction Gears.—When supplied withenough steam, this turbine wyheel will run atabout 10,000 revolutions per minute, and this, ofcourse, is much too speedy for any earthly use. To reduce the speed to something like that ofan ordinary engine a reduction gear is needed, 42 The Boys9 Book of Engine-Building that is a very small gear, or pinion as it is moreoften called, is made to turn a very much largergear and, of course, this one turns more slowly,the rate depending on the relative sizes of the two

Text Appearing After Image:

Fig. 22. The Model De Laval Turbine Complete gears, or their ratio as it is called. A single re-duction gear is shown in Fig. 23. Sometimes there is a second small gear fixedto the shaft of the large gear; this small gear ismade to turn another large gear and this givesyou a double reduction gear. You can rig up areduction gear by using the wheels and pinionstaken from an old clock or you can buy them ^ Two Simple Steam Turbine Engines 43 from dealers in model makers supplies. For aboiler large enough to run this turbine see Chap-ter V. How the Steam Turbine Works.—You maynot have noticed it, but the De Laval turbine

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1918

Library of Congress

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