In this paper, the geometric characteristics of worm drive with double enveloping arc surface machined by datum-plane tool are stated.
本文阐述了平面二次包络弧面蜗杆传动的几何特征，引用数学方程对这些特征加以说明，进而提出了啮合参数选择原则。
If the element being tested with tolerance requirements is an axis, centre line or symmetrical plane, the arrow and datum symbol should be aligned to the dimension line of that element.
当被测要素为轴线、中心线或对称平面时，指引线的箭头和基准符号应与该要素的尺寸线对齐。
Currently available vernier depth gauges are simple in measuring function, especially in measuring precisely the no touchable directly depth of the measuring datum plane.
现有游标深度尺的功能单一，对测量基准面无法直接触碰的深度尺寸难以精确测量。
The article presents the application of technique datum hole in designing special clamps for drilling diagonal bore and finishing inclined plane, and raises calculation analysis.
论述加工斜面、斜孔零件时工艺基准孔在夹具设计时的应用，并提出了计算分析。
However, similar characteristics of deep karst below the present drainage datum plane are less studied up to now.
现代排泄基准面以下深岩溶的类似特征则至今研究尚少。
Select planar surface or datum plane.
任意选择一个平面。
Select planar surface or datum plane.
任意选择一个平面。
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