## 3 Experimental Tests  
In order to train the ANFIS, it is necessary to acquire data from the actual ADT body cover manufacturing process (Figure 4). The technological operation considered to give the final shape is a machining operation. Under this operation, e.g., gearbox kinematic chain bearing seats are machined. The main cover features are as follows:  
* The type and condition of the material used for the case are detailed in specification AMS4215;
* The rough product is a pre-machined sand and die casting;
* Residual casting stress occurs in the rough product;
* The size of the removed material allowance is up to 0.5-0.7 mm;
* Minimum thickness after machining is 4 mm;  
Figure 3: Quality control of production: (**a**) carried out entirely in the measurement laboratory; (**b**) carried out in a large part on the production line; (**c**) carried out entirely on the production line. * Positional tolerance of bearing seats and base holes is 0.076 mm;
* Bearing seat diameter tolerance is 0.050 mm;
* Roughness of bearing seats is Ra = 1.6 \(\upmu\)m.  
Prior to detail machining, the accuracy of the CNC machine was verified by performing the test described in [25]. The machine accuracy assessment was also performed based on the standards ISO 230-2:2014 and ISO 230-6:2002. ISO 230-2:2014 specifies methods for testing and evaluating the accuracy and repeatability of positioning of numerically controlled machine tool axes by direct measurement of individual axes on the machine. These methods apply equally to linear and rotary axes. ISO 230-6:2002 specifies diagonal displacement tests which allow the estimation of the volumetric performance of a CNC machine. It consisted in making a test part and checking the accuracy of the part in a different machine such as a CMM. All geometrical errors were within the required tolerances adopted for a new machine. For measurements on the CNC machine, a Renishaw RMP600 probe (manufactured by Renishaw plc, Wotton-under-Edge, UK) equipped on the machine tool was used. Before machining, the measuring probe was calibrated using a calibration ring and Renishaw calibration procedure. Sufficient accuracy and repeatability of such a measuring system were demonstrated in [15; 19]. The main features of the RMP600 probe are as follows: unidirectional repeatability is 0.25 \(\upmu\)m 2\(\sigma\); 3D lobing in X, Y, and Z is \(\pm\)1.00 \(\upmu\)m; ultra-low stylus trigger force in XY is 0.2 N; the sensitive element is a strain gauge; styli made of high modulus carbon fiber; and communication by radio transmission with frequency hopping spread spectrum technology (FHSS). Then machining of 97 covers was carried out with simultaneous measurement of selected dimensional characteristics. The process was performed on a 5-axis Okuma MU6300V machining center (manufactured by Okuma Corporation, Oguchi, Japan) in an automatic cycle, with no operator interference in machining parameters, machine system positioning, clamping, or measurement method. The cutting tools used for finish boring of bearing seats are precision adjustable boring tools of type 564034 (Allied Machine and Engineering, Dover, OH, USA) with insert holder 210052 and cutting insert TCMT9T306. Carbide cutting inserts with brazed PCD diamond blades were used. Cutting insert working time was assumed to be 1000 h. No wear of the cutting insert or change in the diameters of the bored seats was observed during the machining of the bearing seats in the covers. The cutting parameters for the boring bars  
Figure 4: ADT casing cover in a fixture in a CNC machine—view from the bearing seat side. were selected experimentally and are as follows: cutting speed \(\mathrm{Vc}\) = 12 m/min, feed rate \(\mathrm{fr}\) = 0.02 mm/min, material allowance ap = 0.25 mm, cutting power P = 14 W.  
The aim of the measurements was to obtain experimental data required to build training and inspection (validation and testing) sets for ANFIS. In Figure 5, bearing sets (from 2 to 8) with their position measured for both the CMM and the CNC machine are marked.