From the theory of NC system, the paper puts forward the overall precept of the interpolation in the NC system based on the PC parallel port. It can be designed and tested from both software and hardware and achieves a good result.%数控系统中的插补是数控技术领域具有核心地位的一部分，文章分析了数控系统的原理，提出了基于PC机并行口的数控插补（数字积分法）的设计与实现的总体方案，并从软件和硬件两方面予以设计和调试，达到了良好的实验效果。
展开▼
