# The Influence of Automated Machining Strategy on Geometric Deviations of Machined Surfaces
###### Abstract
Due to the importance of the finishing stage in the manufacturing processes, the face milling process is the solution that can be used to achieve good surface quality and high accuracy in a short period of time. To achieve the high quality of the desired parts, studying the tool path strategies is inevitable too. Surface properties constitute a significant measure of the finished component quality, because they influence features such as dimensional accuracy, friction coefficient, wear, post processing requirements, appearance and cost. The quality of the surface produced by milling depends on various technological parameters, such as the cutting conditions as well as the cutting tool and the workpiece specification [10]. [PERSON] et al. [11] describe the stages of preparation of the milling process and factors impacting the optimization of cutting strategies. To develop an effective milling process, the programmer must choose the right strategies. Appropriate selection of the tool path is important because it defines the axial depth of cut, which influences the maximum cutting force during machining. Its correct definition controls the overall productivity of the machining process and can usually be influenced by computer production systems. Likewise, the method of milling up or down together with the direction of rotation of the spindle also controls the direction of chip removal [12; 13]. When choosing a milling strategy, various factors must be considered, for example, surface roughness or form deviation. The geometry of the tool-related parameters (feed and cutting speed) is equally essential to achieve quality after machining [14]. Among the most used strategies in the production of parts by milling is strategy zigzag, and contour, which we can define using a computer-aided manufacturing system [15]. The zigzag strategy, known as the raster strategy of milling, is a strategy in which the milling cutter moves back and forth along the workpiece in the X-Y plane. In the machining process, we may encounter another problem, such as the generation of toolpaths, which affects not only the performance of the production process but also the quality of machined surfaces [8]. The machining strategy is the methodology used to calculate the operation, where the purpose is to obtain the desired geometric entity in its final form [16]. The efficiency of using a particular toolpath is related to the time required to complete the machining process. The lower limit of the total cutting time for a 2D area is the area divided by the cutting width and the cutting feed rate [17]. Part of the production process is a postprocessor, which provides information about the position of the tool and process parameters [18]. An inseparable part of each manufacturing process is its control. The assessment of manufacturing correctness allows us to define the compatibility between the manufactured product and design requirements. It also allows us to verify the correctness of operation of stages of the manufacturing process [19; 20]. Depending on expectations, one can choose the measuring devices which can give metrologically correct results for required time limits. These requirements apply to all control processes connected with the measurement of mass, time or geometrical quantities [21]. In industry, dimensional and geometric accuracy is checked after the end of the production process. A widely used machines for manufacturing process control is the coordinate measuring machine (CMM) [21]. The increasing importance of geometric tolerances points out many questions related to the mathematical method of evaluation, the point sampling strategies in CMM and the manufacturing possibilities and constraints. Among the most used basic elements/features of a mechanical part are planar elements. The relations between features are defined by dimensions and geometric tolerances, such as flatness, parallelism, perpendicularity and straightness. During the production of the part, dimensional and form deviations from the prescribed value are present [22].