本文件参考ISO 230系列，规定了适用于加工中心或数控铣床等带有水平主轴（即水平Z轴）的附件主轴头的一些试验系列。本文件中考虑的试验也适用于手动分度头。 本文件确定了与不同类型机器上使用的通用和正常精度主轴头相对应的试验结果的公差或最大可接受值。 本文件规定了几套几何测试程序，可在不同类型的主轴头上进行几何测试，以进行比较、验收、维护、调整或任何其他目的。 磨头和端面不包括在本文件的范围内。 本文件仅涉及附件轴头的几何和定位精度验证，不适用于: -机头运行测试（例如振动、异常噪音级、部件的粘滑运动）； -机器的主轴头特性（例如速度、进给和加速度），通常单独检查；或 -在通电情况下验证加工能力。 其他ISO标准中涉及成品试样精度的测试。

This document specifies, with reference to the ISO 230 series, some families of tests for accessory spindle heads used on machining centres or numerically controlled milling machines, etc., where applicable, with horizontal spindle (i.e. horizontal Z-axis). The tests considered in this document are also applicable to manual indexing heads. This document establishes the tolerances or maximum acceptable values for the test results corresponding to general purpose and normal accuracy spindle heads used on different types of machines. This document specifies several sets of procedures for geometric tests which can be carried out on different types of spindle heads for comparison, acceptance, maintenance, adjustments or any other purpose. Grinding heads and facing heads are not included in the scope of this document. This document deals only with the verification of geometric and positioning accuracy of the accessory spindle heads and does not apply to: — the testing of the machine's head(s) operation (e.g. vibration, abnormal sound noise level, stick slip motion of components); — the machine's spindle head(s) characteristics (e.g. speeds, feeds and accelerations) which are generally checked separately; or — the verification of the machining capability under power. Tests concerning the accuracy of finished test pieces are dealt with in other ISO standards.