>> P.63
•PreloaddirectionFig.12-4Duplexfacetoface(DF)PreloaddirectionDuplexfacetoface(DF)AdvantagesBecausethemutualcontactangles(intersectionpositiondimensions)attheshaftcenteraresmall,mountingerrortoleranceisrelativelylargeDisadvantagesRigidityisrelativelylowFig.12-5Duplexbacktoback(DB)PreloaddirectionDuplexbacktoback(DB)AdvantagesBecausethemutualcontactangles(intersectionpositiondimensions)attheshaftcenterarelarge,rigidityisrelativelyhighDisadvantagesMountingerrortoleranceisrelativelysmall63