... or patterns on natural granite, marble, bluestone, crystal stone, rock quartz, crystal stone, microlite, all kinds of artificial stone, glass, village tablet, tombstone, milestone ... vibration during work, then improve processing accuracy 4.Gear wheel for X Y axis, ball screw are uncovered, so it is ... to clean it, after work, ball screw can be cleaned for many times. 5.Water tank can be moved, it is ...