This paper discusses principle of machining a non-round hole by generating. Taking equidistant 3-profile hole as an example, the method of designing and grinding tool is intro - duced.
本文讨论了用展成法加工非圆孔的原理，以加工等厚形三面孔为例，介绍了插刀设计与刃磨方法。
Class descriptions: intro to yoga , level 1, level 2, level 3, lunchtime class, relax & restore, pre-natal yoga, post-natal yoga.
课程介绍：瑜伽入门，1，2，3级练习，午间瑜伽，孕妇瑜伽，产后瑜伽，放松与恢复。
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