The form of the tool used must exactly coincide with the profile of the thread to be cut, i. e. , triangular tools must be used for triangular threads, and so on.
使用的刀具外形必须正好与要切削螺纹的轮廓一致，即三角形刀具必须用于三角形螺纹等等。
2
Adaptive sampling algorithm of surface play an important role in evaluation of profile deviation and surface triangular approximation.
曲面轮廓度误差评价和多边域逼近均要求对理论曲面进行数字化自适应采样。
3
Firstly, the algorithm of triangular bilinear interpolation is shown in detail and applied to acquire the profile from TIN.