# The Influence of Automated Machining Strategy on Geometric Deviations of Machined Surfaces
###### Abstract  
This paper deals with various automated milling strategies and their influence on the accuracy of produced parts. Among the most important factors for surface quality is the automated milling strategy. Milling strategies were generated from two different programs, CAM system SolidCAM, with the help of workshop programming in the control system Heidenhain TNC 426. In the first step, simulations of different toolpaths were conducted. Using geometric tolerance is becoming increasingly important in robotized production, but its proper application requires a deeper understanding. This article presents the measurement of selected planes of robotized production to evaluate their flatness, parallelism and perpendicularity deviations after milling on the coordinate measuring machine Carl Zeiss Contura G2. Total average deviations, including all geometric tolerances, were 0.020 mm for SolidCAM and 0.016 mm for Heidenhain TNC 426. The result is significantly affected by the flatness of measured planes, where the overlap parameter of the tools has a significant impact on the flatness of the surface. With interchangeable cutter plate tools, it is better to use higher overlap to achieve better flatness. There is a significant difference in production time, with SolidCAM 25 min and 30 s, and Heidenhain 48 min and 19 s. In accordance with these findings, the SolidCAM system is more suitable for production. automated machining; milling strategies; geometrical tolerances 2021  
The Influence of Automated Machining Strategy on Deviations of Machined Surfaces  
2021  
The importance of the implementation of CAD CAM systems is often described in the literature. The basic sign of CAM is to minimize human intervention in the course of the production process by the exploitation of computer data processed in the main elements of activities [5]. When machining parts, we encounter several factors, the result of which is a lack of precision of parts. These are factors resulting from the CAM system that are caused by the approximation toolpaths. We can also define an error as any deviation in the actual position of the cutting edge of the cutter from the position that was theoretically programmed for the production of the part within the required tolerance [6]. At present, there is an increasing demand for higher dimensional and geometric accuracy and surface treatment of manufactured parts in various areas of the industry. Among the industries that require tighter tolerances to be achieved, typical examples constitute the automotive, aerospace and medical devices industries, including manufacturing trends such as automatic assembly and micro manufacturing. In this regard, realization of the desired part accuracy imposes criteria in the selection of manufacturing systems, e.g., machine tools. Part accuracy is closely related to machining system capability, which in turn is determined by the interaction between machine tool and cutting processes. These are mainly interfaces between the tool and the workpiece, where positional, static, thermal and dynamic accuracy has a significant effect [7]. The manufacturing of high-accuracy parts sets the basic requirement of a robust machining system able to manufacture within the specified tolerances. Although a controlled and repeatable process is important for maintaining quality, machining system accuracy and precision have a determinant role in part accuracy. Among the challenges that machine and device parts producers face nowadays is the necessity to guarantee a high quality of machined surfaces. Obtaining a high-quality product is an extremely difficult and complex task that entails fulfilling several crucial requirements [8]. The machining parameters are an important part of process plan performance. Equally important in machining is the confidence in the measuring tools, from which part quality characteristics are ascertained [9].