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In the environment in which we live, friction is everywhere. It is not only essential for daily life but also an indispensable element in industrial production. Without friction, it will be difficult for us to walk, run, or even stand ； In the industrial sector, friction is a key force that drives cars, airplanes, and various mechanical devices. However, for industrial machinery, friction is both a friend and an enemy; especially in terms of lubrication, the proper management of friction directly affects the machine’s service life and operational efficiency. In factory environments, rolling bearings are essential components for the proper operation of machinery, and their lubrication is key to ensuring their long lifespan and efficient performance. Unfortunately, however, many bearings fail to reach their designed service life due to improper lubrication. According to statistics, about 40% of bearings fail prematurely due to poor lubrication. Behind this figure lies an urgent need for a deep understanding of lubrication tasks and their proper execution. The lubrication of bearings relies primarily on grease, which can effectively reduce friction levels and protect the bearings from wear and damage. However, in practice, many factories often fall into three common mistakes when lubricating bearings, resulting in poor lubrication effects and even accelerating bearing damage. The first misconception is to lubricate based on time rather than conditions. Many factories* are accustomed to lubricating bearings at fixed time intervals (such as weekly or monthly), yet this approach often overlooks the actual lubrication needs of the bearings. The only reason bearings need grease is to reduce friction; therefore, as long as the grease continues to provide effective lubrication, there is no need to replace it or add more. The proper approach is to use ultrasonic monitoring technology to measure and assess the friction level of bearings in real time, in order to determine the optimal timing for lubrication. The second misconception is excessive or insufficient lubrication. Excessive grease increases the pressure inside the bearing, forcing the rolling elements to penetrate through the fluid film and press against the outer ring, thereby making it more difficult for the bearing to function. Too little grease, on the other hand, fails to form an effective lubricating film, which likewise accelerates bearing wear. To avoid this, factories should use ultrasonic monitoring technology to add new grease slowly, listen carefully to the sound of the bearings, and measure the decrease in friction as the grease flows into the bearings. When the decibel level approaches the minimum value and stabilizes, it indicates that an appropriate amount of grease has been added. The third misconception is relying solely on subjective ultrasound noise to determine the lubrication condition of bearings. This approach is too subjective and lacks accuracy and reliability. The proper approach is to use ultrasonic instruments with digital decibel measurement capabilities; even better, use devices that provide multiple status indicators to monitor the lubrication condition of the bearings. These devices can provide maximum RMS and peak dB measurement values, as well as parameters such as the ultrasonic peak factor, which help us accurately determine the lubrication needs and health status of bearings. By avoiding these three common lubrication mistakes, factories can significantly improve the operational efficiency and service life of mechanical equipment. Ultrasonic-assisted lubrication technology possesses significant advantages that calendar-based lubrication cannot match. It can monitor friction levels in real time to ensure that the bearings operate in optimal conditions ； At the same time, optimizing the practices related to the consumption and storage of lubricating grease can also reduce costs associated with grease and energy. Therefore, for factories, mastering the correct lubrication techniques and methods is not only key to improving production efficiency but also an important guarantee for achieving sustainable development.