... bed , table , column , beam , XZ slide , Z slide are all cast iron structure , and were confirmed by high-temperature tempering ... torsional rigidity. *Z slide and the spidle seat are made in one body , and is accurately machined, ... rigidty and precision. And the Z guide way are mounted on the Y-Z slide, so that the ... once a day , to ensure 15 points at all rail sliders and ball nuts can be lubricated , ...