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1. Integrate MQL systems when possible following the specific MQL requirements • EXPLANATION: For the machining process a finely dispersed atomisation is necessary to achieve a good wetting of the contact zone between tool and work piece. The selection of MQL parameters (flow rate, atomisation etc.) has to be done conscientious in order to achieve acceptable machining results. But the finely atomisation is connected with risks for the health of the workers because of the strain with aerosols. Due to this, the minimum quantity lubrication technology should only be used in a machine tool with an air exhaust installation. When using internal MQL supply systems, there are some variables to take into account: With single-channel-supply systems the aerosol has to cover a long route, and the aerosol components may separate or the droplets coagulate, while properly dispersed, fine droplets to the tool outlets is essential. A two-channel supply system allows a variable adjustment of the droplet size, a secure transport of the mixture, and short response times. Nowadays, there are one channel internal MQL supply systems which have these problems solved. An MQL system usually has to supply many different tools, which require different quantities of oil and air, thus, a further requirement is the complete integration of the MQL system in the NC of the machine tool. • CLASSIFICATION: • Topic: COOLANT AND LUBRICANT • Machine Structure: COOLING SYSTEM • Life Cycle phase: SELECTION OF COMPONENTS • Type of machine tools: GENERAL • Material selection: - • KEYWORDS: Minimum Quantity Lubrication, MQL • SOURCES: Weinert, K., Inasaki, I., Sutherland, J.W., Wakabayashi, T. “Dry machining and minimum quantity lubrication”, 2004 • LINKS: • FIGURES/GRAPHS: 026