Design defects and hydraulic system elements aging are the main causes of the gantry milling machine's fault.
设计缺陷和液压系统元件的老化是导致龙门铣床出现故障的主要原因。
In rough cut of NC milling of helicoid, there are many defects when the generic programming means, for example, longer cutting time, inefficient, exigent tools are used.
在螺旋曲面的数控粗加工中，采用一般的编程方法得到的刀具路径在实际应用中存在加工时间长、效率低、对刀具要求高等缺点。
The basic types of dry stoners, their specific advantages and defects, and the main forms for them to be disposed in rice milling process are presented.
对比重去石机的基本类型、各自优缺点及其在加工工艺中的主要配置形式进行了简单介绍，阐述了比重去石机在稻米加工工艺中几种常见且合理的用法。
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