. American engineer . gram gives the depth of cut in inches, which will be one- OfO shown liy tlie dotted line indicates that a machine work-ing with a i4-in. depth of cut and a J^-in. feed and running at80 ft. per min. cutting speed will remove 60 cu. in. of metal aminute. This would require 24 horsepower if the metal wascast iron, 36 horsepower if of wrought iron or steel, and 60horsepower if steel tires were to be turned. To indicate anotherway of using the table, we will assume that a lathe has a motorwhich will deliver 20 horsepower for the length of time that theoperation requir
. American engineer . gram gives the depth of cut in inches, which will be one- OfO shown liy tlie dotted line indicates that a machine work-ing with a i4-in. depth of cut and a J^-in. feed and running at80 ft. per min. cutting speed will remove 60 cu. in. of metal aminute. This would require 24 horsepower if the metal wascast iron, 36 horsepower if of wrought iron or steel, and 60horsepower if steel tires were to be turned. To indicate anotherway of using the table, we will assume that a lathe has a motorwhich will deliver 20 horsepower for the length of time that theoperation requires. Assume that a cast-iron piston head, 24 diameter, is to be turned. The machine is assumed to befitted with speed changes such as will allow a speed of 95 revo-lutions a minute of the spindle to be obtained, which will givea cutting speed of about 60 ft. per minute. If the diameter isto be reduced ^ in. the depth of cut will be ^-i in. Referring tothe table, it will be seen that 20 horsepower for cast iron is. z /e S re 4 Oep^/} of Cuf in Inches. 16 a 16Horsepovnei , Casf Iron 4 8 IZ le zo Z4 Z8 3Z ^l e IZ 18 Z4 30 3e 4Z 48 Tires 10 zo 30 40 SO 60 70 80 Diagram Giving the Relations of Feeds, Cuts, Cutting Speed, IVIetal Removed and tiie Horsepower for IVIachine Tools. half of the reduction in diameter in the case of lathe or boringmill work, and above it are diagonals marked for various feedsfrom 1/32 in. to 3/16 in. The combination of the depth of cutand the feed will, of course, give the area of the cut in squareinches and this is shown in the scale at the center of the the right half of the diagram are shown the cutting speedsfrom 10 to 120 ft. per minute. The area of the cut multipliedby the cutting speed will give the cubic inches of metal removeda minute. This is shown on the bottom scale of the right-handhalf of the diagram. Directly below this is given a scale of thehorsepowers required for doing the work on three differentmaterials, viz.; cas
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
