So, it is necessary to have a stabilized platform in the tool to obtain steady angle adjustable and independent to the rotation of drilling string.
因此，在调制式旋转导向工具中，就必须设置一个不受钻柱影响的、可以自动保持和调整工具面角度的稳定平台。
Spindle bearing on the stability of operation in direct influence on the processing quality, once the spindle rotation precision decrease of the machine tool use value will be low.
主轴在轴承上运转的平稳性直接影响工件的加工质量，一旦主轴的旋转精度降低，则机床的使用价值就会降低。
The J-slot profile creates the track for an actuating CAM or pin that combines rotation and up or down movement to provide a simple yet reliable means of tool activation.
钩形槽的型面为主动凸轮或销钉(它使旋转与向下或向上移动相结合)提供轨道，于是提供了简单的但又可靠的启动工具的方法。
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