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The paper describes a way of generating a cost model, which is aimed to compare different drilling processes. The development of this tool is a part of an ongoing European Union funded aircraft industry project called ADFAST (Automation for Drilling, Fastening, Assembly, Systems Integration, and Tooling). This part of the project involves 4 industrial partners, (Alenia, Airbus Espana SL, Airbus UK and Saab AB), 1 equipment developer (Novator AB) and 1 academic institute (Linkoping University). The model has been created to enable the benefits of an advanced system such as orbital drilling to be quantified. The model is able to generate a cycle time and a cost for the whole drilling process involving equipment, consumables and assembly of varied aircraft structures. The challenge of the task was to develop the ability of modeling a process with a sequence of drilling operations that the model user, in an intuitive way, can select and modify.