在金属切削机床的大、中修工作中,普遍需要修磨或修刮燕尾导轨。要恢复燕尾导轨的精度,测量手段是一个很重要的环节。过去,人们普遍沿用千分尺与短圆柱或百分表与凹形角铁配合测量的方法,由于导轨形状的限制,被测导轨间距较大,百分表杆较长刚度不好等原因,测量数据往往不准。针对上述情况,北京811厂设计了一种燕尾导轨量具,经使用证明,质量稳定,尺寸准确,精度可达3～5微米左右。这 In the metal cutting machine tools, repair work, the general need to repair or repair dovetail guide rail. To restore the accuracy of the dovetail guide, measurement means is a very important part. In the past, people generally follow the micrometer and short cylindrical or dial indicator and concave angle with the method of measurement, due to the restriction of the shape of the rail, the guide rail spacing is larger, the longer the rigidity of the dial rod is not good and other reasons, the measured data Often not allowed. In response to the above, Beijing 811 plant designed a dovetail gauge, proved by the use, quality and accuracy, the accuracy of up to 3 to 5 microns. This