. Railway mechanical engineer . Fig 2—Running Gear of Pe riotive, Class Lis Total main rod 720 930 Front end of side 185 136 Back end of side rod 231 .Side rod (main pin) Kear end eccentric rod (equivalent at 13 in. radius) The material for the main and side rods, piston rod, pins and \alve motion parts is silico-manganesc carbon steel, heat treated, with the following characteristics: Carbon per cent Ultimate ,000 lb. per sq. in. Manganese per cent Elastic limit lb. per sq. in. Silicon per cent Elongation in 2 in 20 per cent Phosphorus ..
. Railway mechanical engineer . Fig 2—Running Gear of Pe riotive, Class Lis Total main rod 720 930 Front end of side 185 136 Back end of side rod 231 .Side rod (main pin) Kear end eccentric rod (equivalent at 13 in. radius) The material for the main and side rods, piston rod, pins and \alve motion parts is silico-manganesc carbon steel, heat treated, with the following characteristics: Carbon per cent Ultimate ,000 lb. per sq. in. Manganese per cent Elastic limit lb. per sq. in. Silicon per cent Elongation in 2 in 20 per cent Phosphorus .. .Not over per cent in area 40 per cent Sulphur Not over per cent ,] ^ g/I I g Thi Pisfon Rings ihouttj be fumed ^*I6~A M M r/S larger in diamefer fhan bore of. The pistons are made of rolled open hearth carbon steel. Thecrossheads are of cast steel made by the electric furnace process,with the following qualities: Carbon per cent Ultimate tensile strength. Manganese to per cent to 80,000 lb. per sq. in. Silicon to per cent Elongation in 2 in. 12 to 25 per cent Until a designtr has actually tried, he does not realize what it mined, as there is no really satisfactory formula for the designof pistons. Lnwins, Seatons and Bachs formulas are all wellknown, and the designer may possibly use them all as a guide;but in the last analysis he must use his judgment, especiallywith this shape of piston, as it is known to be actually strongerthan any of the formulas will show. It will be noted that nocast iron wearing shoe is used, and that the wearing surface ofthe rim is only 3^ in. wide, but the piston rod has an extensiontail rod. If the extension rod had not been used, the employ-ment of such a narrow wearing surface
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
