... better ragidity,more smoothly running and less vibration for whole machine;Imported rolling ball screw for X,Y and Z axis ... °CRelative humidity :30%-75%WarrantyFor non-wearing parts one yearOptional :Rotary device Servo systemFloating head Dust collecting system Cast iron table ... wrench , cross screwdriver ,RS-232 wire ,control card mini cnc rotary milling engraving machine for special industy