In the modern years, natural fibre composites have been converted into significant materials in many industries such as automotive, aerospace and and so on. Several types of natural fibre composites, particularly plant-based fibre composites, have been developed and tested. However, their mixed nature, engineer’s requirement of experience, an understanding of machinability databases, limit setting and trouble in manufacturing are barriers to extensive use of composites. The final shape of the natural fibre–reinforced composites (NFRCs) are obtained by conventional and unconventional machining. Machining of these composites generates confront due to the heterogeneous and anisotropic nature. Different methodologies and tools are intended to overcome the machining defects. In this article, a wide range of literature review on machining of NFRCs is examined with focus on conventional and unconventional machining operation. This article also discusses the influences of machining parameters and optimum conditions for machining of NFRCs.

The use of composites in industries has become inevitable due to the enhancement in properties, reduction in the manufacturing cost and suitability to several applications. Among the different classifications, polymeric composites are majorly focused for their use as structural components. In a polymeric composite, the selection and composition of reinforcement play a vital role in deciding the characteristics of the composite. Although composites are developed with man-made reinforcement in the beginning stage, in the present scenario, natural reinforcements have proved consummate results in terms of properties. Hence, present day researches are mainly focused on the use of different natural fibers in different forms as reinforcements in polymeric composite. The present study gives a clear picture of various available natural fibers and how they are made in the form of reinforcement for composites. The study also explains the diverse pre-treatment methods used by the researchers for the enhancement of fiber quality. In addition, this review also gives a detailed insight of how the natural fibers are used in the hybrid form for the improvement of composite property.

Bio-degradability and sustainability have become major objectives in the field of materials engineering. Due to this, the utilisation of natural reinforcement is gaining immense attention among composite researchers. Among the different composites, polymeric composites are used as structural components. In the present day investigations, bio-elements are majorly utilized as reinforcements due to their properties and bio-degradability. Although polymeric components are manufactured in the shape of the final component, they need secondary processing to make it suitable for assembly. Hence, a review on machining and associated investigations on bio-composites would help the composites industries and upcoming researcher to know the scope of research and for selection of apt machining conditions. This review gives a detailed insight on the various machinability factors and their measurement, influence of machining parameters on the machinability and optimum conditions during machining of bio-composites. In addition, this review also presents about the importance of bio-fibre under various situations of machining and untraditional machining methods used for bio-composites.

Machining is an inevitable task after processing a material. Among the different materials, fiber-reinforced plastics are used as structural materials in different industries. Compared to conventional materials, fiber-reinforced plastics are less hard by its nature. Due to this reason, the cutting force required during machining a plastic material is lesser than that of other materials. Although the cutting force is less, the influence of other machining parameters on the ease of machining is to be investigated in order to reduce the machining time and cost. Hence, a review on the machining associated successes and failures will be helpful for the manufacturing sectors and researchers in line with the machinability. This review provides a detailed picture of various issues dealt during machining a plastic material. The influences of manufacturing methods on the machinability and machinability measurement methods are comprehensively addressed. In addition, this review also discusses about the influences of machining parameters and optimum conditions for machining. The review also addresses various statistical methods used, machinability enhancement methods adopted, and unconventional methods used in the various researches.

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