## 7 Conclusions  
Reduction mechanisms, such as the high-precision bearing reducers of today's drive units in the field of machine tools and automation, are state-of-the-art and technologically advanced. Subjecting such mechanisms to a trial run is important. The development of new materials, lubricants, smaller production tolerances and new final technologies have  
Figure 20: Course of temperatures on the BR TS 050 support body over a 48 h mode. reduced the trial run length, but it is nevertheless irresponsible to apply the full load to the reduction mechanism right from the start. The obligatory test operation cannot be considered a fully fledged trial run, as the test operation mostly serves the purpose of verifying the functionality of the reduction mechanism. In the field of mechanical engineering technology of surface production, new technologies enable the production of surfaces to a precisely defined value. Specific properties are characteristic of each surface of a component material. Each bearing reducer component that comes into contact with another surface must adjust its position to the opposite component. In metal-to-metal contact, friction occurs. Friction increases metal wear. Each reduction mechanism includes rolling elements and bearings that reduce friction by allowing the two surfaces to roll relative to each other, thereby reducing the amount of friction generated. It is now considered a standard for components of high-precision reducers to be deburred, demagnetized and washed. Research in this area has mapped in detail the impact on all the essential variables' characteristic of the high-precision reducer properties. The trial run was carried out in both recommended configurations of the load application onto the reducers, namely by means of a mechanical weight on the arm and by applying the load through a servomotor. Based on the research carried out, it is possible to recommend that each user, after installing the bearing reducer in the appropriate alignment, does a trial run during operation for at least 48 h with a 50% TR load under the nominal torque and a maximum speed of 1000 rpm. In case of the oil version, it is recommended to change the entire oil content after the first 100 h of operation following the trial run. At the same time, based on the research documented above, a methodology was established for measuring the important properties of high-precision reducers in connection with their trial run, which consists of the following steps:  
* Reducer trial run over 48 h, max. 60 \({}^{\circ}\)C temperature NT, 50% TR at max. 1000 rpm. * Measurement of abrasion Fe particles--max. Fe content of particles 50 ppm. * Measurement of the reducer starting torque--input 10 rpm, upon completion of one rotation of the output BR member, at the sampling frequency of the sensor of 200 samples per second. * Measurement of hysteresis (H) and lost motion (LM)--in load-free state, TR = 100% Nm in both directions (CW, CCW), evaluation at 3% TR load. * Angular transmission error measurement (ATE)--in load-free state, output 0-720\({}^{\circ}\), in both directions (CW, CCW). * Repeated accuracy measurement--output rotation 1800\({}^{\circ}\), eight desired positions at 360\({}^{\circ}\). This methodology unifies our approach to measuring the static and dynamic properties of high-precision reducers to identify their critical parameters and positioning accuracy. The article points out two possibilities of running-in bearing reducers. The run-in was performed by a mechanical weight on the arm and by a load servomotor. The research showed that the choice of the load has a negligible effect on the values of lost motion and hysteresis, but it has a demonstrable effect on the values of the monitored parameter--starting torque and fluctuation of starting torque. However, in both trial run methods, the surfaces were smoothed, which was reflected in the torque fluctuation--a drop in the peaks.