The development of software for preventive estimation of cutting forces and cutting conditions of complex turning operations has been discussed in this paper. The aim of this software was to support the preventive process design and optimization, in terms of cutting conditions, chip control, cutting forces, workpiece dimensions and surface roughness for complex turning operations. The modeling of the workpiece was based on the quadtree technique which allows complex workpiece shapes, optimized computer memory management and very fast elaboration time. Also, the modeling of cutting forces has been discussed in this paper. The software was tested for development of parts programs for high-quality automotive components evidencing good prediction capabilities with short elaboration time on a conventional desktop computer.