迹字石油化工大學⊙ error work 16521(Mh)C单( CMAX
迹字石油化工大學⊙ C The Machine is a Structural loop The structural loop contains all the joints and structural m e that position the tool wrt the workpiece A stick figure of machine motions can outline the structural loop The structural loop gives an indication of machine stiffness and accuracy Long-open loops have less stiffness and lann ann rn Structural loo X carriage Toopindle Workpiec Workpiece Fixture Fixture Y table XY table
C.The Machine is a Structural Loop • The structural loop contains all the joints and structural e l e m e n t s that position the tool wrt the workpiece – A stick figure of machine motions can outline the structural loop • The structural loop gives an indication of machine stiffness and accuracy – Long-open loops have less stiffness and less accuracy
迹字石油化工大學⊙ D Where the errors act the center of stiffness a body behaves as if all its mass in concentrated at its center of mass a body supported by bearings, behaves as if all the bearings are concentrated at the center of stiffness The point at which when a force is applied to a locked-in-place axis, no angular motion of the structure occurs It is also the point about which angular motion occurs when forces are applied elsewhere on the body Found using a center-of-mass type of calculation(K is substituted for M) ◆K: ◆
D.Where the Errors Act: The Center of Stiffness • A body behaves as if all its mass in concentrated at its center of mass • A body supported by bearings, behaves as if all the bearings are concentrated at the center of stiffness – The point at which when a force is applied to a locked-in-place axis, no angular motion of the structure occurs – It is also the point about which angular motion occurs when forces are applied elsewhere on the body – Found using a center-of-mass type of calculation (K is substituted for M)
迹字石油化工大學⊙ E Creating Successful Machines Leading Vs. Bleeding Edge Technology for the sake of itself has little use when it comes to proauction macninery Leave no microns on the table elbat eht no srallod no eval Design for the present and the future Modularity is the key to upgrading designs to the next technology curve Sensors and software are key upgrading catalysts Understanding errors in components and machines is the key to staying on the leading edge!
E.Creating Successful Machines: Leading vs. Bleeding Edge • Technology for the sake of itself has little use when it comes to production machinery – Leave no microns on the table:elbat eht no srallod no evaeL • Design for the present and the future – Modularity is the key to upgrading designs to the next technology curve – Sensors and software are key upgrading catalysts • Understanding errors in components and machines is the key to staying on the leading edge!
迹字石油化工大學⊙ Pure mechanical Servo axes Mapped servo Bleeding edge Coagulated edge Leading edge Performance