Measure the radius of the bottom of the thread

In the processing of threaded parts, the measurement of the radius of the bottom of the thread is often encountered (Fig. 1). The accuracy of the round value directly affects the assembly interference of the threaded part and the tensile and fatigue resistance. Usually the measured threaded parts are compared according to the eyepiece model in the projector, and the data span is large, which cannot meet the needs. In order to ensure accurate measurement, we use the triangle to measure the arc as shown in Figure 2:

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