. Railway age . produced n three-spindle machine whichwould require but one setting of the work andwhich would Insure the parallel boring of allcylinders and chambers. While this type ofmachine possesses a number of advantagesfor certain classes of work, the single barmachine luis been found superior for generallallroad practice. A comparison of the two types of machines shows that the single bar has less gearing andis the simpler machine of tlie two ami is consequently minh easiermaintained. On account of the lesser number of parts, the singlebar machine Is the more economical to drive, hence
. Railway age . produced n three-spindle machine whichwould require but one setting of the work andwhich would Insure the parallel boring of allcylinders and chambers. While this type ofmachine possesses a number of advantagesfor certain classes of work, the single barmachine luis been found superior for generallallroad practice. A comparison of the two types of machines shows that the single bar has less gearing andis the simpler machine of tlie two ami is consequently minh easiermaintained. On account of the lesser number of parts, the singlebar machine Is the more economical to drive, hence the power re-quired can be obtained from a small motor. Where there are in boring three chambers nt once it has been found Inpractice that chatter in one tool is transmlttiMl to the other tools,causing a rough llnish In all bores. It Is appariMit that this is en-tirely obviated In the single bar machine. From experience in theordinary railroad shop It has been found that the single bar machine. Boring Non-Parallet Cylinder Chambers. machines produce very excellent work. But the examples thus farconstructed are heavy, ponderous affairs, costing a great deal forthe weight of metal in them alone, and they do not have the uni-versally wide range for accommodating all classes of locomotivecylinder boring that should be a requisite in modern machines forthis purpose. Their flrst cost is high, and the best results are notalways obtained from them, not to of the relative large amountof shop room required. At the Topeka shops of the Santa Fe there has been built acylinder boring mill which will answer all requirements in boringcylinders for all classes of compound engines. This machine isalso adapted to bore cylinders on engines which have one cylinder
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
