测量齿顶圆直径估算分度圆螺旋角，用分度头在铣床上修正分度圆螺旋角，并进行误差分析。
The spiral angle of graduated circle was rough estimated by measuring the addendum circle diameter and modified on milling machine.
配置万能铣头、圆工作台、分度头等铣床附件，可进一步扩大机床使用范围。
When it is provided with accessories such as universal milling head , rotary working table and indexing head etc. can enlarge the application range of machine.
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