进给保持（Feed Hold），在加工程序执行期问，暂时中断进给的功能。
实验结果证明进给驱动的刚度足够大，能够保持研磨位置精度。
The experimental results demonstrate that the stiffness of the feed drive is large enough to maintain the position accuracy.
旋压过程中保持一定的负偏离(3%左右)，同时采用较大的进给比有利于提高旋压件精度。
Moreover, keeping negative error (3% or so) of wall thickness and adopting big feeding rate are beneficial to improve the precision of spinning parts.
全新电源系统，针对大面积及深孔加工，电脑可选定二段伺服进给速度，加工性能优异并可保持放电精密度。
Newly designed power supply system. While in machining big surface and deep hole, the computer provides two steps servo feed for superior machining quality and discharge accuracy.
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