General method to generate 2D data of plane design curve are put forth, and method of 3D modeling and data process is given which belongs to a result of coordinate transform from 2D process data to 3D irregular curves on cylinder surface.

Least squares approximation for non-circular curve in NC machining;

Machining parts with non-circular curve contour by CNC lathe——programming idea of using User′s macro program

The design of non-circular curve spare parts numerical control machining program that is based AutoCAD software is discussed.

The thesis introduces an equal difference between an approximate value and an accurate value waY for panel point's coordinate calculation of the irregular curve by means of tangent line's approaching;illustrates it with a concrete example;and falls back on MATLAB mathematic software to draw an imitation picture of cutting tools' locus.

Design plan of blind signature based on elliptic curve and its application;

(t,n) Threshold group signature scheme based on elliptic curve cryptosystem;

Algorithm of factorization based on elliptic curve;

Therefore,non-circle curve only can be machined on the machine by linear approximation or circular approximation.

The methods of user macroprocessor programming of the non-circle curves part described with mathematic equation in the numerical control process were discussed.

This article provides a new method to achieve non-circle curve numerical control machining by using macro program.