International Journal of Research and Review Vol. 9; Issue: 12; December 2022 Website: www.ijrrjournal.com Research Paper E-ISSN: 2349-9788; P-ISSN: 2454-2237 International Journal of Research and Review (ijrrjournal.com) 586 Vol. 9; Issue: 12; December 2022 The Effect of Cutting Speed on the Wear and Tear of Dormer A100 Brazil Drill Bit Applied to Gray Cast Iron Muksin R. Harahap*, Abdul Haris Nasution, Suhardi Napid Faculty of Engineering, Universitas Islam Sumatera Utara, Medan, Indonesia * Corresponding Author: Muksin R. Harahap (muksin.harahap@ft.uisu.ac.id) DOI: https://doi.org/10.52403/ijrr.20221267 ABSTRACT Drilling is the process of making holes by pressing a rotating drill bit on the workpiece. During the machining process there is interaction between the drilling bit and the workpiece in the drill bit of the workpiece with a hole while the drill bit undergoes friction. Such a friction comes from the chipped surface that flows on the surface of the workpiece that has been cut; as a result, the tool wears out. The wear of the drill bit that occurs due to friction between the drill bit and the workpiece needs to be examined so that the extent of the wear and tear is known. The purpose of this study was to determine wear on the Dormer A100 Brazil drill bit with size (8 mm), rotation speed (260 rpm, 375 rpm and 710 rpm). Tool wear data was collected using a microscope with a magnification of 20x. Tool wear is seen three times during the drilling and the machining process. The result obtained is that the higher the cutting speed, the bigger the wear occurs. Keywords: Dormer A100, gray cast iron, drilling process INTRODUCTION Several previous studies regarding the drilling process have been carried out [1] on the effect of changing the drill point on the twist drill in order to minimize the heat generated when drilling manganese steal materials. The result of changing the drill point is to increase the life of the twist drill by 33% longer than conventional drills [2] . The purpose of this study is to determine the effect of cutting speed on the wear of the Brazilian Dormer A100 drill bit which is applied to gray cast iron. The benefits of this research are: 1. to provide input to the machining/metal industry regarding the effect of cutting speed on the Brazilian Dormer A100 drill bit on gray cast iron. 2. to provide information/contribution to researchers regarding the impact/effect that occurs in tool wear when drilling uses Dormer chisels on gray cast iron workpieces. LITERATURE REVIEW The wear of the drill bit basically occurs due to the process of friction which causes the drill bit to heat up and the surface becomes flat due to friction where it becomes hot and the surface becomes flat due to friction which causes wear and tear on the angle of the drill bit due to the angle of the drill bit being used for processing. When drilling and friction often occurs, the life of the drill bit will quickly reach its limit and it is easily broken. Drilling parameters greatly affect surface roughness, drill wear, material removal rate and hole diameter deviation. Liao and Lin examined the minimum requirement of cutting fluid in cutting with lubrication, extending tool life, reducing cutting forces and smoother surface roughness [3] . Ramesh has paid attention on the stability of boring tools in the turning process focusing on