Common use of Machine Capability Cm A1 Clause in Contracts

Machine Capability Cm A1. 1 Cmk 设备能力 Cm，Cmk 1.01 The Cm index describes machine capability; it is the number of times the spread of the machine fits into the tolerance width. The higher the value of Cm, the better the machine. The Cmk index is used to study the position of the machine’s capability in relation to the tolerance limits, which describes the capability corrected for position. It is not much use having a high Cm index if the machine setting is way off center in relation to the middle of the tolerance range. A high Cmk index means, then, that it is a good machine with a small spread in relation to the tolerance width, and also that it is well centered within that width. A1. 1.01 Cm 指数体现了设备能力,是设备能力相对于公差宽度分布（标准差）的倍数。设备能力值越高，设备越好。Cmk 指数用于研究设备能力相对于公差极限的位置，其描述了针对位置修正的能力。如果设备设置偏离公差带中值， 那么即使 Cm 指数很高，但并不代表设备能力高。高的 Cmk 值意味着一台好的设备，在相对于公差宽度内的分 布很窄，并且位于公差带中心。 A1.1.02 A1.1.02 Cmk Index shall usually be ≥ 2,00 and shall be calculated considering a control chart with typically 50 consecutively produced parts per cavity. Different Cmk target or data collection process can be required A1.1.02 设备能力指数通常应≥ 2,00,并且通常应每腔连续取样 50 件，参考控制图的结果来计算。根据不同 OEM 规范 by RÖCHLING based on OEM specification. 要求，劳士领将提出采用不同的设备能力指数目标值或是数据收集过程的要求。