PurposeThe purpose of this paper is twofold. First review the relevant literature in machining using minimum quantity lubrication (MQL), contrast the economical, environmental, and technical attributes of this technology to conventional flood‐cooling techniques. Second highlight areas of relevant future research.Design/methodology/approachThe approach consists of describing the essential elements of MQL as a technology, reviewing the relevant research by focusing on the most frequently used machining processes in this industry, highlighting the findings as they compare to flood cooling, and pointing to directions of required research in this technology.FindingsThe application of MQL in machining has shown better results in some processes; including in drilling, a cleaner environment, and a more cost‐effective machining technology. Further research is required however to better understand the underlying cause an effect phenomena in machining using microlubrication technology including environmental and health effects of this technology.Practical implicationsThe paper provides a body of knowledge required for all stakeholders to better use or design machining systems using microlubrications.Originality/valueThis paper focuses on the state of the art of MQL and how it contrasts with conventional methods of machining.

 Abstract-Micro lubrication or also known as minimum quantity lubrication (MQL) serves as an alternative to flood cooling by reducing the volume of cutting fluid used in the machining process; but not without significant health concerns. Flood cooling is primarily used to cool and lubricate the cutting tool and work piece interface during machining process. The adverse health effects caused by the use of coolants and the potential economic advantages of greener machining methods are drawing manufacturer's attention to adapt and develop new methods of using lubricants. The objective of this paper is to review the state of the art literature in machining using MQL, highlight the benefits, but also stress the adverse health effects of using minimum quantity lubrication. Finally we highlight areas of relevant future research.Index Terms-minimum quantity lubrication, green machining, MQL, micro lubrication.

Microlubrication minimizes the exposure of metal working fluids to the machining operators leading to an economical, safer, and healthier workplace environment. In this study, a vegetable oil-based lubricant was used to conduct wear analysis and to analyze the effectiveness of microlubrication during end milling AISI 1018 steel. A solid carbide cutting tool with bright oxide finish was used with varying cutting speed and feed rate having a constant depth of cut. Abrasion was the dominant wear mechanism for all the cutting tools under consideration. Other than abrasion, sliding adhesive wear of the workpiece materials was also observed. The scanning electron microscope investigation of the used cutting tools revealed microfatigue cracks, welded microchips, and unusual built-up edges on the cutting tools flank and rake side. A full factorial experiment was conducted and regression models were generated for both the sides of tool flank wear. The study shows that with a proper selection of the cutting parameters it is possible to obtain higher tool life.

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