This paper proposes the method dealing with the concept of factory floor culture (FFC) tentatively in order to discuss it among many machining engineers and researchers deeply. Firstly, FFC is explained and treated as manufacturing culture for machining process aspect in this paper. Then FFC is defined with steadied folklore-phenomenon, and the phenomenon is simulated using a contact process in case of tool-usage in the Stone Age. Furthermore, motivation of NC machine purchase is analyzed associating with a questionnaire investigation of it in Japanese small scale companies. Finally, the analyzed result is illustrated by the Catastrophe Theory.