The lin ear positioning errors are compensated by the compensation of the thread pitch a nd thread clearance in the machine tools.

通过补偿机床螺距和丝杠间隙误差，实现了机床线性定位误差的补偿。

Proper variate thread pitch techniques can be adopted to improve the distributions of detention forces, so as to strengthen casing strings'loadsupporting capability.

采用适当的变螺距工艺可使扣牙力分布得以改善，从而提高套管柱承载能力。

A new software-based method for flexible thread pitch error compensation is proposed, considering the traditional equi-thread pitch error compensation and the usage of the CNC machine tools.

将传统的等螺距误差补偿与机床使用情况相结合，提出并采用软件方法实现弹性螺距误差补偿。

The equations for thread taper, thread pitch, thread angle and height of thread can be derived on the base of fitted lines, which are accurate enough to meet the needs of industrial measurement.

该方法可测量螺纹的锥度、螺距、螺纹夹角和螺纹高度，测量精度可以满足工业测量要求。

A type of screw and nut with coarse pitch was applied to realize thread core demoulding automatically.

采用螺距粗的螺丝和螺母实现螺纹型芯自动脱模。