Compression cancellous bone screw with both ends thread is a Variable pitch screw designed tO provide rigid 'fixation of cancellous bone fracture.
双端螺纹松质骨加压螺钉的特点是两端螺纹具有不同的螺距，无螺帽。
This paper introduces a design method of variable pitch screw, This methed make use of multinomial, bring out the boundary conditions which the design need and the operating range of the methed.
本文介绍了一种变螺距螺杆的设计方法，该方法采用多项式，并提出了设计所需的边界条件和这种方法的使用范围。
The paper analyses the structural characteristic and work principle of screw with variable pitch, designed machining technics, put forward a particular method of nc programming.
文中分析了异型截面供送变螺距螺杆的结构特点和工作原理，设计了其加工工艺，提出了一套加工该螺杆的独特的数控编程方法。
Programming by the plane curve unwrapped from the helix curve and cutting layer by layer, we created the variable pitch screw on the 3.5 axis NC milling.
文章基于3.5轴数控铣床，利用螺旋线展开的平面曲线编程，分层切削，加工出变螺距螺纹；
It is difficult to machine the variable pitch of screw part on the CMC lathe without variable pitch cutting faction.
对于只具备普通螺纹切削功能的数控车床，一般来说不能加工变螺距的螺纹。
CNC lathe; variable pitch screw; NC Program; on the cutting point; graphic method;
数控车；变螺距螺杆；NC程序；起刀点；图解法；
CNC lathe; variable pitch screw; NC Program; on the cutting point; graphic method;
数控车；变螺距螺杆；NC程序；起刀点；图解法；
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