About accuracy, we have observed that after some time "Machine accuracy can increase gradually" and after long time, the difference reach to its maximum level. How about your machine?

The frame of the machine is annealed, it can support shock resistance(the machine will deform if without annealing ). So the accuracy of the machine can keep its original accuracy for 4-10years. The weight of the machine can reach 3.5t-23t. It also can let the machine have higher accuracy and higher stability.