机车制造上经常使用一些大尺寸的量规,俗称地规,用以检查制件尺寸,装配时定位及划线等工作。由于这些地规形状比较复杂(而量脚又不在一平面上),尺寸又过大,对精度要求,也比较严格,因而比较难于进行准确的尺寸检定。如摇杆量规(图1)尺寸为3045± Locomotive manufacturing often use some large-size gauge, commonly known as rules, to check the size of parts, positioning and marking assembly and other work. Because of these geodume shape is more complex (but not on a flat foot), the size is too large, the accuracy requirements, but also more stringent, it is more difficult to conduct an accurate dimensional verification. Such as rocker gauge (Figure 1) size of 3045 ±