File:Railway mechanical engineer (1916) (14575011538).jpg

Identifier: railwaymechanica96newy (find matches)
Title: Railway mechanical engineer
Year: 1916 (1910s)
Authors:
Subjects: Railroad engineering Engineering Railroads Railroad cars
Publisher: New York, N.Y. : Simmons-Boardman Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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part, and the last column,the total saved per locomotive. It will be noted that theaggregate saving in these parts was 1,490 lb. Of the 94 lb. saved in one main rod, 42 lb. was in thereciptocating part of the rod. This, added to the 99 lb.saved in one piston rod, gives a saving in reciprocatingweight for each side of 141 lb. The driving wheels of thislocomotive were balanced in accordance with the MasterMechanics formula of balancing SO per cent of the i-ecip-rocating weight. Fifty per cent of this 141 lb. dividedamong four wheels gives a saving in reciprocating weightof 18 lb. per wheel. Table II shows the reciprocating weight of 18 lb. perwheel, to which is added the saving in the revolving weightfor each wheel due to the lighter main and side rods andcrank pins. It will be noted from this table that there wasa saving in balance at the crank pin of 29 lb. for each frontwheel, 66 lb. for each intermediate, 171 lb. for each mainand 38 lb. for each back wheel. The centers of gravitv of
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October. 1922 RAILWAY MECHANICAL EXGIXEER Actual veight of weight of Saving in Saving in xn-vana- carbon steel weight perpiece, lb. weight per n parts, lb. parts, lb. engine, lb. 102 102 472 532 60 120 120 130 10 20 120 130 10 20 332 431 99 19S 1206 1300 94 188 - 32S 353 ■25 50 72S 7S3 55 110 270 290 20 40 13S3 1520 137 137 2081 2220 139 139 1406 1545 139 139 1406 1545 139 139 the balances, however, were farther out than crank pinradius, and the actual savings in weight were 15.6 for front,34 for intermediate, 101.S for main and 19.6 lb. for theback wheels. Twice the sum of these four savings, or 342 lb.,is what was saved in the wheels themselves. This, added tothe l-,490 lb. given in Table I, or 1,832 lb., is what was TABLE I.—WEIGHT OF PARTS. Name of part Front Crank Pin Main Crank Pin Inter Crank Pin Back Crank Pin Piston Rod Main Rod Side Rods, Front ,i. Side Rods, Inter Side Rods, Back Front Driving Axle Main Driving Axle Inter Driving A.xle Back Driving Axle Trailing Truck A

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