一、引言LAY3开关是一种国际通用标准的可拆卸式机床电器开关,是西安机床电器厂最新研制的国家定型产品。国家对该产品的开关开距、超距都有严格的检验标准。由于LAY3开关本身结构的限制,用人工方法几乎无法对其开距和超距进行准确的测量,过去只能对个别产品进行粗略的抽检。所以对LAY3开关的检验直接影响到了产品的信誉。应两安机床电器厂的要求,我们研制了 I. Introduction LAY3 switch is an internationally accepted standard removable electrical machine tool switch, Xi’an Machine Tool Factory is the latest development of national stereotypes products. The country on the product of the switch from the distance have a strict inspection standards. Due to the structure of the LAY3 switch itself, it is almost impossible to accurately measure its open distance and distance using manual methods. In the past, only rough sampling of individual products was conducted. Therefore, the test of the LAY3 switch directly affects the credibility of the product. Should be two safety electrical appliances factory requirements, we developed