A movement unit for a machine tool comprises a supporting structure movable in a first direction for supporting a functional unit of the machine tool, with two longitudinal guides extending in the first direction which are offset relative to one another in a transverse second direction. The present invention also provides an extension plate having a plurality of screw holes and corresponding screw locking mechanisms. The rotating seat is changeable between a rotatable state and a non-rotatable state. In one embodiment, a normalized model generation process generates normalized data model representing attributes and normalized features of a product. In addition, the waste lubricant, from which water is eliminated, is introduced into a waste lubricant discharging chamber by discharging means, and is passed through an electrostatic separator by an oil pump, to collect particulate pollutant.