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在机械工业企业的制造和修理中，经常遇到大孔径工件内径的测量，如受条件的限制不能直接测量时，可制作如图1的长杆量规进行间接测量。1测量方法与原理利用长杆量规测量大孔径工件内孔直径，长杆量规应比被测rrrrrrrrn孔略小一些，还应根据其长度、刚性等决定量规的直径。灭，电弧长时间燃烧，将接点架的塑料部件熔化后形成故障点
In the manufacture and repair of machinery industry enterprises, large diameter workpiece diameter is often encountered in the measurement, such as the conditions can not be directly measured, you can make the long rod gauge as shown in Figure 1 indirect measurement. 1 Measurement methods and principles The use of long rod gauge measurement hole diameter of large-diameter workpiece, rod gauge should be slightly smaller than the measured hole should be based on Its length, rigidity, etc. determine the diameter of the gauge. Off, the arc burning for a long time, the plastic parts of the contact frame after the melting point of failure