Single needle method for measuring trapezoidal and zigzag threads

In the case of trapezoidal and zigzag threads with high machining precision, the three-needle method is generally used for measurement, but the application of the three-needle method has many limitations and is inconvenient to use. We use single-needle measurement when machining high-precision trapezoidal and zigzag threads, which is simple and accurate. When the thread is measured by the single needle method, the machining accuracy of the top circle directly affects the measurement accuracy M value. Generally, the finished outer circle is used as a front preparation before turning the thread profile.

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