The large-diameter (φ100～φ300mm) trapezoidal thread type multi-head screw or multi-head worm has a spiral position error which is one of the key factors affecting the matching precision and interchangeability. In single or small batch production, because of the large volume and weight of the workpiece, not only the processing workers are difficult, but also the measurement is difficult. In many years of practice, we have summed up a more mature measurement method to better solve this measurement problem. This measurement method can also accurately measure under the condition that there is still a margin, so it plays a role in improving the processing quality.
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