Sai Prashanth

Bio: Sai Prashanth is an academic researcher from Anna University. The author has contributed to research in topics: Taguchi methods & Robotic arm. The author has an hindex of 1, co-authored 3 publications receiving 101 citations. Previous affiliations of Sai Prashanth include College of Engineering, Guindy.

Effect of Different Lubricants on Small Hole Drilling in Ti-6Al-4V – A Taguchi-Grey Approach

Abstract: The world is moving towards miniaturization of all systems to conserve space and energy. In this experimental investigation, small holes of 0.5 mm diameter were drilled in Ti-6Al-4V plates of thickness 0.4 mm. L18 orthogonal array, the signal to noise (S/N) ratio, and the analysis of variation (ANOVA) were employed to analyze the effect and contribution of process parameters, namely, spindle speed, feed rate, and the use of different lubricants. Drilling experiments were performed in dry, air cooled and wet lubrication (palm oil). Tool wear and hole circularity were evaluated for each machine setting using a Scanning Electron Microscope (SEM). Optimization was performed using Taguchi method and Grey relational analysis. The outcome of this study showed that palm oil can be used as an effective lubricant in order to minimize tool wear and circularity error. Multi performance optimization revealed that feed rate and lubrication were the most significant parameters in controlling circularity and tool wear.

Design and Control of a Dexterous Anthropomorphic Five Fingered Robotic Arm

Abstract: The primary objective of this research involves designing and fabrication of a wireless controlled five-fingered anthropomorphic dexterous robotic arm. Multiple joints are provided in the arms and fingers to mimic a realistic human-like motion. The mechanism is designed with the prime aim of increasing its efficiency in terms of performance, energy consumption and economy while reducing the total system weight. The design is followed up by the fabrication of mechanical sections of the arm and the assembly of the complete system. Finally, interfacing of the robotic arm with an external glove that can be worn by the user to control the arm motion is done through utilization of a wireless medium. The kinematics of the system, the overall mechanism for actuation and spring design for restoring the elements to their original positions are discussed in the paper.

Advanced cutting tools and technologies for drilling carbon fibre reinforced polymer (CFRP) composites: A review

Abstract: Carbon fibre reinforced polymer (CFRP) composites have excellent specific mechanical properties, these materials are therefore widely used in high-tech industries like the automobile and aerospace sectors. The mechanical machining of CFRP composites is often necessary to meet dimensional or assembly-related requirements; however, the machining of these materials is difficult. In an attempt to explore this issue, the main objective of the present paper is to review those advanced cutting tools and technologies that are used for drilling carbon fibre reinforced polymer composites. In this context, this paper gives a detailed review and discussion of the following: (i) the machinability of CFRP including chip removal mechanisms, cutting force, tool wear, surface roughness, delamination and the characteristics of uncut fibres; (ii) cutting tool requirements for CFRP machining; and (iii) recent industrial solutions: advanced edge geometries of cutting tools, coatings and technologies. In conclusion, it can be stated that advanced geometry cutting tools are often necessary in order to effectively and appropriately machine required quality features when working with CFRP composites.

Application of cutting fluids in machining of titanium alloys—a review

Abstract: Titanium alloys are widely used in aerospace, biomedical, and other engineering areas due to their superior properties. However, machining of titanium alloys has always been a challenge due to the high temperatures and tool wear rates. Dry machining has a limited range of permissible cutting conditions and is hence not suitable for industrial production. As a solution, flood cooling using cutting fluids is conventionally used to reduce the cutting temperatures. However, it is often discouraged in light of the associated environmental and health hazards. In order to achieve sustainable machining, different strategies for applying the cutting fluids are developed. Some of the prominent methods include minimum quantity lubrication (MQL), minimum quantity cooled lubrication (MQCL), and cryogenic cooling. This paper provides a comprehensive review of the available recent literature on such studies. Each of these techniques and results obtained in the studies has been discussed with emphasis on the advantages and limitations of each method. Major conclusions drawn are that coated carbides are better and machinability is greatly affected by the microstructure of the material. MQL certainly improved compared to other methods while cryogenic or super cooled cutting fluid application (MQCL) has been found to be better for specific situations. Use of nanofluids for titanium is not very popular among the researchers.