At the bottom of this page, a fixture is placed as a sample, whose dimensional accuracy is +-0.002 thousandths or 4 microns/mm, and then this level of accuracy was reached with very special methods. The reason for the high accuracy of the tolerance is to obtain the accuracy of the angles with a tolerance of ten minutes. After the final assembly, all the positions of these fixtures are within the permissible range up to one hundredth of a millimeter, and this accuracy also decreases to the same 4 microns during the machining operation. This degree of precision is also a little rare in CNC machines.