ISO 13041-2:2008 specifies, with reference to ISO 230-1 and ISO 230-7, the geometric tests on general purpose numerically controlled (NC) turning machines and tuning centres with vertical workholding spindles, as well as the corresponding applicable tolerances. ISO 13041-2:2008 explains different concepts or configurations and common features of NC turning machines and turning centres with vertical workholding spindles. It also provides a terminology and designation of controlled axes.