# Comprehensive Evaluation Method for High-Performance
## 2 Materials and Methods
Based on the values of the grey relational grade (GRG, \(\gamma\)), a summary can be developed that includes the most favorable parameter sets and machining methods for the rough milling of Inconel alloys. The algorithm for using the described method is presented in the flowchart (Figure 1). In order to conduct the analysis using the above-described method, it is necessary to prepare a testing setup. The Inconel sample must be properly prepared to allow for trials using both plunge milling and high-feed milling. The input material for the tests was a bar made of Inconel 718 with a diameter of 152.4 mm (6 inches) and a length of 150 mm. To avoid the issues commonly encountered in the machining of Inconel 718, preliminary machining was carried out on a FANUC Robcott G600 iA/5/AWF/Z400 wire EDM machine. Another important aspect was preparing the sample so that it could be mounted on the dynamometer. Figure 2a shows the shape of the Inconel 718 sample after wire EDM machining, while Figure 2b illustrates the technical drawing of the tool necessary to mount the material in the dynamometer. The method of mounting the sample in our experiment is designed to ensure the highest possible stiffness of the machined component. As shown in the research [36], the stiffness of the Inconel 718 alloy part is crucial for the stability of the machining process and the minimization of vibrations, which directly affects the results obtained during milling. The measurement of forces was crucial during the experiments. It allowed for the observation and evaluation of process stability and the impact of cutting-edge wear on the process. Forces were measured in three directions aligned with the machine's main axes--X, Y, and Z--referred to as F\({}_{\rm x}\), F\({}_{\rm y}\), and F\({}_{\rm z}\), respectively. An important aspect was the amplitude of the forces, as it indicated process stability. The larger the fluctuations, the less stable the process, and the more likely catastrophic tool wear would occur due to vibrations between the tool's cutting edge and the workpiece material. The force measurement setup consisted of a Kistler piezoelectric dynamometer model 9199 AA, a Kistler 5070A charge amplifier for F\({}_{\rm x}\), F\({}_{\rm y}\), and F\({}_{\rm z}\) forces, a Kistler 5697A data-acquisition device, and a laptop with DynoWare 2825D software for data analysis. To measure energy consumption, a SoneI PQM-701 power quality analyzer was used to record real-time network parameters. This allowed for the recording of active and reactive power values at the set frequency. The power quality analyzer was connected to the HAAS VF3/YT milling center according to the diagram shown in Figure 3.  
Figure 1: The flowchart of the algorithm implemented within the comprehensive evaluation method. Figure 2: (**a**) Test sample made from Inconel 718; (**b**) fixture for mounting the Inconel 718 sample on the dynamometer. The measurements of cutting insert wear were carried out in the measurement laboratory. A ZEISS O-INSPECT 332 multisensory machine with a measurement range of 300 \(\times\) 200 \(\times\) 200 mm was used for the wear analysis of the inserts. This was a numerically controlled measurement device equipped with both a tactile scanning head and a ZEISS Discovery V12 measuring lens, operating like a microscope, with a field of view ranging from 1.3 \(\times\) 1 mm\({}^{2}\) to 16.1 \(\times\) 12 mm\({}^{2}\), depending on the magnification used. Measurements could be performed in both transmitted and reflected light. Full adjustment of the light intensity in two colors--blue and red--was available, allowing for contrast adjustments during reflected light measurements, regardless of the color and material of the measured part. The tests were conducted on a HAAS VF3/YT milling center. This is a 4-axis machining center with a working area of 1016 \(\times\) 660 \(\times\) 635 mm. It was equipped with an SK50 tool holder system, which is dedicated to roughing operations. The machine was fitted with a spindle, delivering a maximum power of 22.4 kW.