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1中文英文14页8516字数翻译部分LATHEANDTURNINGTHELATHEANDITSCONSTRUCTIONALATHEISAMACHINETOOLUSEDPRIMARILYFORPRODUCINGSURFACESOFREVOLUTIONFLATEDGESBASEDONTHEIRPURPOSE,CONSTRUCTION,NUMBEROFTOOLSTHATCANSIMULTANEOUSLYBEMOUNTED,ANDDEGREEOFAUTOMATION,LATHESOR,MOREACCURATELY,LATHETYPEMACHINETOOLSCANBECLASSIFIEDASFOLLOWS1ENGINELATHES2TOOLROOMLATHES3TURRETLATHES4VERTICALTURNINGANDBORINGMILLS5AUTOMATICLATHES6SPECIALPURPOSELATHESINSPITEOFTHATDIVERSITYOFLATHETYPEMACHINETOOLS,THEYALLHAVEALLHAVECOMMONFEATURESWITHRESPECTTOCONSTRUCTIONANDPRINCIPLEOFOPERATIONTHESEFEATURESCANBESTBEILLUSTRATEDBYCONSIDERINGTHECOMMONLYUSEDREPRESENTATIVETYPE,THEENGINELATHEFOLLOWINGISADESCRIPTIONOFEACHOFTHEMAINELEMENTSOFANENGINELATHE,WHICHISSHOWNINFIG111LATHEBEDTHELATHEBEDISTHEMAINFRAME,INVOLVINGAHORIZONTALBEAMONTWOVERTICALSUPPORISITISUSUALLYMADEOFGREYORNODULARCASTIRONTODAMPVIBRATIONSANDISMADEBYCASTINGITHASGUIDEWAYSTOALLOWTHECARRIAGETOSLIDEEASILYLENGTHWISETHEHEIGHTOFTHELATHEBEDSHOULDBEAPPROPRIATETOENABLETHETECHNICIANTODOHISORHERJIBEASILY