跳动公差是形位公差的综合项目

Runout Tolerance is Integrated Item of Geometric Tolerance

跳动公差以其检测方便在回转类零件设计中被广泛使用。不少人认为:跳动公差是专为检测方便而设置的一种位置公差项目,国家标准形位公差(GB1182-80)也将跳动公差项目归类为位置公差。其实,跳动公差除了可以综合控制部分形位公差项目外,当跳动与零件的实际工作状态吻合时,就有其特定的功能和作用,所以说,跳动公差不是简单的位置公差,而是形位公差的综合项目。

Runout tolerance is widely used in rotary parts because of its convenient detecting.It is common thought that runout tolerance is a kind of position tolerance designed for easy detection.National Standards Geometric Tolerance（GB1182-80） also classifies runout tolerance to position tolerance.Actually,runout tolerance has its own specific functions and effects in addition to comprehensive control of geometric tolerance items when beating and the actual working condition of parts anastomose.So it is safe to say that runout tolerance is not a simple position tolerance but an integrated item of geometric tolerance.