. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e value of constant C taken as 1 forthe material turned off. The equationto satisfy these values becomesH P = 1/7 X 5/i6 X 16 X 12 X 2 X CThis gives a horse-power of 17. Another example is that of a planerworking on a wrought iron engineframe, with two tools having 5/32 , Yi in. cut, 16 ft. per minute, with Required for Shop Tools. A most instructive and exhaustivetreatment of the subject of the PowerRequirements of Railroad Shop Toolsfrom the pen of Mr. L. R. Pomeroy,recently ap
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . e value of constant C taken as 1 forthe material turned off. The equationto satisfy these values becomesH P = 1/7 X 5/i6 X 16 X 12 X 2 X CThis gives a horse-power of 17. Another example is that of a planerworking on a wrought iron engineframe, with two tools having 5/32 , Yi in. cut, 16 ft. per minute, with Required for Shop Tools. A most instructive and exhaustivetreatment of the subject of the PowerRequirements of Railroad Shop Toolsfrom the pen of Mr. L. R. Pomeroy,recently appeared in the General Elec-tric Review. Space does not permit usto reproduce the whole article, but thelight thus thrown on this importantsubject makes a few extracts quite inorder. The formula used by Mr. Pomeroyto calculate the horse-power requiredto drive various shop tools when en-gaged in doing work will be found con-venient by many master mechanics andgeneral foremen or others interestedin the subject. The formula as given isHP = F X D X X 12 X N X C Where F is the feed in inches D is. U. P. NEW BRIDGE AT FORT STEELE,WYO. a value for C of The equation be-comes H P = 5/32 X lA X 16 X 12 X 2 X gives a horse-power of 15. The third example is of an mill, working on 62-in. cast irondriving wheel center with three cuttingtools at work, a feed of V% of an inch, acut of 1/10 of an inch taken at the rateof 30 ft. per minute with a value for C , the lowest value given for cast substitutions for this machine makethe formula stand H P = V& X 1/10 X 30 X 12 X 3 X gives a horse-power value of machine designed for axle workand capable of taking two cuts J4 X1/12 ins. at 24 ft. per minute wouldrequire 18 horse-power. This machine,Mr. Pomeroy says, would usually besupplied with a 20 electric motor,yet for the average requirements ofrailroad shop work 10 would prob-ably be sufficient. The table of powervalues given be
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