我厂生产的紧固件产品,品种繁多,大批的螺钉螺母是有精度要求的,如头部端面对螺纹中心线有垂直度或跳动要求,螺孔(螺纹)中心对平面的垂直度,平行度或本身圆孔对螺纹中心的同轴度等要求,如图1所示。这样的零件检验测量要用检具来解决,但设计检具比较困难,主要原因一是螺纹 I plant the production of fasteners, a wide variety, a large number of screws and nuts are precision requirements, such as the head end of the thread centerline has a vertical or beating requirements, screw hole (thread) center of the plane perpendicularity, Parallelism or the hole itself on the center of the thread coaxial requirements, as shown in Figure 1. Such parts inspection and measurement tools to solve the problem, but the design of seized more difficult, one of the main reasons for the thread