The complex structure of turning aggravates obtaining the desired results in terms of tool wear and surface roughness. The existence of high temperature and pressure make difficult to reach and observe the cutting area. In-direct tool condition, monitoring systems provide tracking the condition of cutting tool via several released or converted energy types, namely, heat, acoustic emission, vibration, cutting forces and motor current. Tool wear inevitably progresses during metal cutting and has a relationship with these energy types. Indirect tool condition monitoring systems use sensors situated around the cutting area to state the wear condition of the cutting tool without intervention to cutting zone. In this study, sensors mostly used in indirect tool condition monitoring systems and their correlations between tool wear are reviewed to summarize the literature survey in this field for the last two decades. The reviews about tool condition monitoring systems in turning are very limited, and relationship between measured variables such as tool wear and vibration require a detailed analysis. In this work, the main aim is to discuss the effect of sensorial data on tool wear by considering previous published papers. As a computer aided electronic and mechanical support system, tool condition monitoring paves the way for machining industry and the future and development of Industry 4.0.

Drilling is considered as one of the more challenging problems in the aerospace structures stringent tolerance required for fasteners such as rivets and bolts to join the mating parts for the final assembly. Fiber-reinforced polymers are widely used in aeronautical applications due to their superior properties. One of the major challenges lays in the machining such polymers is the poor drilled-hole quality which reduces the strength of the composite and leads to part rejection at the assembly stage. In addition, rapid tool wear due to the abrasive nature of composites requires frequent tool change which result in high tooling and machining costs. This review intended to give in-depth details on the progress of drilling of fiber-reinforced polymers with special attention given to carbon fiber reinforced polymers. The objective is to give a comprehensive understanding of the role of drilling parameters and composite properties on the drilling induced damage in machined holes. Also, the review looks into the drilling process parameters and its optimization techniques, and the effects of dust/ aerosols on human health during the machining process. This review will provide the scientific and industrial communities with their advantages and disadvantages through better drilled-hole quality inspection.

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