The bell has a specific name of the site, known as moving the upper and the lower part is called the drum bell mouth 16.20 for milling, bell onthe lips say, Name-minute dance.
钟的各部位都有着特定的名称，上部称为钲，下部谓之鼓，钟口两角为铣，钟唇曰于，钟顶名舞。
Based on the analysis of the rotation of cosine drum cam, this paper introduces a special de- vice to mill this type of cam on the ordinary horizontal milling machine.
通过对余弦鼓形凸轮运动特征的分析，介绍了在普通卧式铣床上利用分度头和回转工作台拼装的铣余弦鼓形凸轮形面的工装，实践证明，可保证较好的加工质量。
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