When designing manufacturing systems composed of CNC machines, there are multiple topological layout options such as serial, parallel and hybrid structures. This paper uses six different configurations of a six CNC machine manufacturing system to show that different configurations have profound impact on requirements of machine specifications and system performance such as productivity. First, machine level reliability in different configurations may be different because machining requirements and processing specifications on the same parts is different in each configuration. This paper associates machine reliability with each machine's machining complexity and the number of axes it has. Then system level productivity can be deduced based on machine level reliability models. Numerical results are presented by combining system level productivity analysis and machine level reliability models. Some observations are discussed based on these numerical results.
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