In this paper we analyzed the effect of feed rate and depth parameters on machining costs in production. The process used was the turning of parts with cast iron base material. For this study, the feed rate between 0.2 mm and 0.8 mm and the depth in the range of 1 mm to 4 mm are varied, allowing to find parameters that affect the final finish of the part, such as the cutting speed and the working conditions of the machine. Other important parameters defined in this process are the process times that directly influence the final costs and how production can be maximized. With this paper is shown the increase in cost in the machinability of turning in a máximum production system. Keywords-Feed Rate, depth, machining cost, cutting process. I. INTRODUCTION Foundryisoneof the most demanding and energy-intensive processes in which there are currently six different stages: casting, alloying, casting, pouring, solidification and finishing[1]. The casting process has not yet reached its full potential in limiting losses due to tilting, tipping, lost foam and other factors for the material [2-3].Therefore, this process clearly depends on the viscosity of the fluid, but if the demand includes the precise reproduction of mould details and overall dimensional accuracy, additional factors such as flow analysis affected by the rheological properties of the sludge, wetting, melting pressure and high temperatures should be considered, leading to a variety of part defects that affect subsequent machining processes to achieve the final finish[4-5]. If parts are defective it presents many challenges to operators and personnel involved in the production process, because the margin of error for a part's operating specifications is very limited[6], and if it is so imperfect it may reach an unrecoverable point, directly causing loss of money and time affecting the company's productivity[7-8]. In order to mitigate this problem a little, it has been proposed to analyze the operation ranges to which the specialized machinery and the production of parts must work, evaluating factors such as the cutting speed, the useful life of the parts for the final finish, the revolutions per minute of the machinery, among others[9]; presenting an area of efficiency where production gains are obtained at different advances and depths in the machining process[10]. The main contribution of this work is to present a methodology that analyzes the influential parameters in the production of the machining of the parts by turning, allowing to analyze the ranges in which a lathe must be operated so that there are no economic losses in the mass production of a specific part. Allowing the scientific community to focus on optimizing another stage ofthesmeltingprocess. II. METHODOLOGY The following is a description of the process and the fundamental equations for the analysis of costs and time in the turning process for grey foundries, allowing the identification of the parameters that have the greatest impact on this machining process. 2.1. Process description In o...