Features: 1) The main drive has two kinds:single speed and dual speeds. 2) It can grind and polish slabs with greatly varying thickness,tombstones,and stone with design. 3) The worktable for grinding interior/exterior arcs can be custom-mode. 4)It uses round column as its guide slip surface for steady automatic ups and downs Technical Data of SMS-1800 series are as follows: NameGyroradiusGrinding wheel diameter Range of vertical movementElevating mechanismGeneral powerDimensions(LxWxH)WeightUnitmmmmmmkwmmkgSMS-1800A650x30001050-650Electric5.873300x750x1800850SMS-1800B650x30001050-1050Electric5.873300x750x2200900SMS-1800C650x36001050-1050Electric5.873700x750x2200950SMS-1800F650x30001050-650Electric5.873300x750x1800850