In this paper first investigations concerning the characteristic particle contamination of metal cutting processes and theories of the influence of those particles are presented. For the definition of a customized cleanliness standard, the characteristics of the particles need to be investigated in more detail. Nowadays standards mainly consider the diameter of the particles as main parameter. Theoretical studies however reveal that size, mass, form and concentration of the particles have a combined effect on the failure of machine tool components and the cutting process. In the present contribution, chosen cutting processes are investigated regarding their characteristic influence on contamination. By analyzing the contaminated fluids from cutting experiments it could be shown that each process-material combination shows a unique particle spectrum in the coolant. These findings were subsequently used to define a first methodology for the definition of a customized cleanliness standard.
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