本文介绍一种生产实践中研制成功且实用性很强的键槽对称度精密测试专用仪器,并对该仪器的结构特征、工作原理、使用性能和精度等作了较全面的介绍,有推广应用和拓展为商品的价值。 In this paper, we introduce a special instrument for precision testing of keyway symmetry, which has been successfully developed in practice and has strong practicability. The structural characteristics, working principle, performance and accuracy of the instrument are introduced in detail. Expand to the value of goods.