NCSIMUL is a complete machining simulation software for debugging, optimising and running machining programs for NC (numerical control) machine tools. NCSIMUL’s problem-solving capability significantly boosts the cost-effectiveness of the NC environment, including not only programming, but also tooling selection, clamping methods, tools and attachments, machine-tools and the time devoted to the NC process by all the people involved. NCSIMUL * reads and decodes the machining programsused by the machine-tool controller, displays them and enables changes to be made where necessary via a powerful graphic editor, * simulates the machine-tool motion taking into account its characteristics (dimensions, axes, ranges, compensations, controller type) and the machining program, * simulates material removal from the rough stock, and performs a detailed check of the resulting part dimensions, computes the cross-sections, and compares the finished part with the theoretical CAD model, * optimises cutting conditions based on tool/material combinations and instant machining conditions (plunge, grooving, chip size, authorised power, etc.), * edits toolpaths by providing sophisticated functions such as the insertion or deletion of NC blocks, the rewriting of ISO programs (translator), etc..