In order to assure the processing quality of slender axle for concentrated sulfuric acid pump, according to the actual situation of company, adopted simple turning installations, back feed and suited with the geometry parameter of the best of cutting tool, which improved rigidity of the axle and got visible effects.

According to the actual situation of company,adopted simple turning installations,back feed and suited with the geometry parameter of the best of cutting tools.

This paper adopts pointed lathe tool to turning inclined ellipse on NC lathe and makes custom macro program of rough machining and finish machining, introduces the set up of mathematical modeling, the calculation method of start angle and end angle, the machining process is presented.