Inconel 718, a thermal-resistant nickel-based alloy, is used extensively in the aircraft industry. Due to the high toughness and work hardening properties, the use of metal cutting fluids (MCF) in machining operations is very significant. The application of the MCF to the cutting zone can minimize heat generation and reduce wear rate at the cutting edge. Surface roughness is often considered as a quality indicator for the finished or semi-finished product. This research evaluates the performance of non-edible vegetable oils which are castor and rice bran oil towards the tool wear and surface roughness. The drilling experiments were conducted using coated (TiAlN) carbide drill at various cutting speeds of 10 and 20 m/min and a constant feed of 0.015 mm/rev. The results of this research reveal castor oil outperformed rice bran oil in reducing tool wear and improved surface roughness.
