This paper describes the construction of an elliptical-cylindrical model without spherical aberration using vertical rotating tools. The engine of the circular tool is placed on one arm so that the tool fits on the surface and this in turn is moved by an X-Y table. The test method and computer algorithms that predict the desired wear are described.
Mendoza, B. V., Dávila, A. C., & García, J. G. (2011). Techniques for the construction of an elliptical-cylindrical model using circular rotating tools in non CNC machines. In Journal of Physics: Conference Series (Vol. 274). Institute of Physics Publishing. https://doi.org/10.1088/1742-6596/274/1/012061