1·To support the principle of triangulation, etc., the rolling process, the workpiece can improve roundness, concentricity, perpendicularity.
以等三角支撑原理，进行滚压加工，可提高工件真圆度、同心度、垂直度。
2·This paper analysis NC machine tool perpendicularity error.
文章分析数控机床垂直度误差。
3·Perpendicularity - is the condition of a surface, axis, or line, which is 90 deg. From a datum plane or a datum axis.
垂直度-条件是表面，轴，或线，这是90度的基准平面或基准轴。
4·General side box for parts parallelism, perpendicularity and testing and marking, universal side boxes designated for inspection or precision of the workpiece at any Angle line.
一般方箱用于零部件平行度、垂直度和检验和划线，万能方箱用于检验或划精密工件的任意角度线。