International Journal of Innovative Technology and Exploring Engineering (IJITEE) ISSN: 2278-3075, Volume-8 Issue-10, August 2019 3953 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number J99310881019/19©BEIESP DOI: 10.35940/ijitee.J9931.0881019 Abstract: CNC machine is an industrial manufacturing machine that is used to improve quality and productivity of a product. Good tool life and surface finish of this CNC machining product are produced by applying wet cooling technique. However, this technique had affected the workpiece, tooling, health and environment. Also, there is only 10% to 15% of coolants used from the total amount of supply in the system and this lead to waste and increase productivity cost. Hence, the idea of using Programmable Logic Control (PLC) that inspired the control system of coolant supply plays an important role in developing the modern technology and industry for machining. The purpose is to develop a time-based automated coolant supply system and to test the system performance through evaluation of the roughness of the workpiece surface. The adjusted device to control the coolant supply employed a washing machine inlet control valve. Basically, the used of PLC is able to fulfil the function of the valve operation to control the flow of the coolant through the ON-OFF sequence based on time. Results from the experiment prove that better surface roughness is achieved through the application of automated coolant supply system. Hence, relationship between surface roughness and reduction in consumption of coolant in this system is also obtainable. Index Terms: Automated Coolant Supply, Time-based, Surface Finishing, Turning Machining. I. INTRODUCTION Development of Computer Numerically Controlled (CNC) machine is a tremendous contribution to the manufacturing industries [1]. Although, the performance of the machines allowed high automated control, the increasing of heat due to friction and energy lost can lead the cutter to be unsharpened which can decrease the productivity of the product. Thus, coolant system is necessary as a safeguard to a system from overheating and to remove excess heat at the workpieces. The most function of the coolant system is to cool and to lubricate machines and cutting tools. Generally, the common coolant types that are used in manufacturing are cutting oils and cutting fluid. The interface between tool’s cutting edge and the chip at the cutting stage is prevented using the cutting fluid as it is used in the coolant system at CNC machine. It was stated by Courbon et al. [2] that the accredited of favourable thermos-mechanical Revised Manuscript Received on August 05, 2019 Wan Nur ‘Izzati Wan Md Hatta, Graduate School of Engineering, Universiti Teknikal Malaysia Melaka, Durian Tunggal, Melaka, Malaysia. Fairul Azni Jafar, Faculty of Manufacturing Engineering, Universiti Teknikal Malaysia Melaka, Durian Tunggal, Melaka, Malaysia. Farizan Md Nor, Department of Technology & Proses, Kolej Kemahiran Tinggi MARA Kuantan, Kuantan, Pahang, Malaysia. Ahamad Zaki Mohamed Noor, System Engineering and Energy Lab, Universiti Kuala Lumpur – Malaysia Spanish Institute, Kulim Hi-tech Park, Kulim, Kedah, Malaysia. interaction crafted by the acted coolant for the foregoing benefits. Later than, it was clearly explained by Mia and Dhar [3] that these benefits are diminished by poor health of human operator triggered of the environmentally in compatible coolant. Environmental degradation is another issue. However, the serious issues about health, environment and economy had been affected by the use of coolant fluids. Based on Sartori et al. [4] whose stated that cutting fluid disposal, components cleaning, pollution and human health damage are some of the problems that affect toward more stringent regulation in order to inspire the application of innovative environment-friendly technologies. Therefore, to investigate the problems, minimal quantity lubrication (MQL) is used and evaluated regarding the surface roughness, tool wear, temperature deviation, depth of cut and the amount of the coolant system. It is the process of applying minute amounts of high-quality lubricant directly to the cutting tool or workpiece. According to a study, Unist [5] stated that, Ford saw a 13% decrease in overall cost after the implementation of MQL. After that, it was stated again that this decrease in costs was due to a significant fluid reduction, reduced costs of coolant handling, better cutting tool life, decrease of maintenance as well as increase of machine uptime. Moreover, MQL minimizes environmental impact by reducing fluid usage and decreasing the need for coolant treatment and disposal. With the details concepts of MQL application, it has sparked the idea of this research work because the application of MQL refers to a small amount of cutting fluid with the form of mist rather than flooding the workpiece. This option can reduce waste and minimize the production cost. The aim of this project is to program Programmable Logic Controller (PLC) for an automated coolant supply system in CNC turning machine as well as to analyse the performance of the automated coolant system in CNC turning machine with regards to surface roughness and tool wear. II. RELATED WORKS CNC machine consists of a microcomputer that performs controller unit of the machine. The functions of the computer are to control, automate as well as monitoring the movement of the machine axes, workpiece and tool. With the works of drive components and a few motors, CNC machine controller can be used to drive directly to the motion of machine axes and calculated the programming motion in the system. Machinibility Performance of CNC Turning Based on Automated Coolant Supply System Wan Nur ‘Izzati Wan Md Hatta, Fairul Azni Jafar, Farizan Mohd Nor, Ahamad Zaki Mohamed Noor