Adin, Mehmet Şükrü2024-05-072024-05-072024https://hdl.handle.net/20.500.12402/4537Carbon fiber reinforced composites are widely used materials in the aerospace and aviation industries due to their superior properties. In order to make such materials ready for use, machining is required. However, various difficulties are encountered during the machining of these materials. Therefore, great importance is attached to research on high-quality machining of these materials. For this purpose, in this research, carbon fiber reinforced epoxy composite with "0°/45°/90°" fiber angles (known as quasi-isotropic fiber orientation), which creates a more uniform strength distribution, was chosen as the workpiece. In this context, average surface roughness (Ra) values were investigated by drilling the carbon fiber reinforced epoxy composite workpiece with a 5.2 mm diameter High Speed Steel (HSS) drill at different spindle speeds (1200, 2400, 4800 rev/min) and different feed rates (0.04, 0.12, 0.20 mm/rev) parameters. As a result of the experimental study carried out, it was observed that the surface roughness increased depending on the increase in the feed rate, and decreased depending on the increase in the number of revolutions. The smallest surface roughness value was found as 2.15 μm, and the largest surface roughness value was found as 4.15 μm. It was revealed that the largest surface roughness value was 93% higher than the smallest surface roughness value.info:eu-repo/semantics/openAccessCarbon fiber reinforced compositesHSS drillSurface roughnessQuasi-isotropic fiber orientation865874