IntroductionMachining is the most important part of the manufacturing process. Turning is one of the most commonly employed basic operations in experimental metal cutting work. The work material is held in the chuck of a lathe and rotates. The tool is held rigidly in a tool holder and moved at a constant speed along the axis of the feed bar, cutting away a layer of metal to form the desired profile. The components of the cutting force acting on the tool are an important aspect of machining. Basic information about cutting force must be known in order to understand the relationship between the different components of cutting force. Many force measuring devices, such as force gauges, have been developed and are capable of measuring tool forces with increasing accuracy. Avila and Abrao (2001) studied the effect of machining hardened AISI 4340 steel. The workpiece material has been heat treated to an average hardness of 49 HRC. Mixed alumina tools were used as the cutting tool. The experimental tests were carried out with variable cutting speeds ranging from 50 to 100 m/min with a constant feed of 0.15 mm/rev. and a constant depth of cut of 2 mm in roughing. For finishing, the cutting speed values ​​range from 200 to 400 m/min for a constant feed and depth of cut of 0.05 mm/rev and 0.5 mm respectively. The different cutting fluids used were: emulsified without mineral oil, synthetic and emulsified containing mineral oil. The fluids were pumped at a rate of 75 l/min. The experiment concluded that the cutting fluid (emulsified without mineral oil) resulted in longer tool life compared to dry cutting. At high cutting speeds, the cutting fluid was responsible for reducing the dispersion in the rough surface...... middle of paper......, MW Islam, S. Islam, MAH Mithu, L he influence of minimum lubrication quantity (MQL) on cutting temperature, chip and dimensional accuracy in turning of AISI-1040 steel, Journal of Materials Processing Technology 171 (2006) 93–99. Suresh Dhiman, SK Sharma, Rakesh Sehgal, Vishal S. Sharma Influence of Approach Angle and Cutting Parameters on Cutting Force, Tool Tip Temperature and Surface Roughness During Turning of adamite, International Journal for Manufacturing Science & production, Vol.8. No. 24, 2007. Vishal S Sharma, Manu Dogra, NM Suri, Cooling techniques for improved productivity in turning, International Journal of Machine Tools & Manufacture 49 (2009) 435-453. Vishal S. Sharma, Suresh Dhiman, Rakesh Sehgal, SK Sharma, Estimation of cutting force and surface roughness for hard turning using neural networks, J Intell Manuf (2008) 19:473–483.