12

2022-12

What are the characteristics, installation, and lubrication methods for miniature linear guides?

The primary performance characteristic of miniature linear guides is their high positioning accuracy. The motion of these miniature guides is achieved through rolling steel balls, resulting in low friction resistance between the guide pairs, minimal difference in static and dynamic friction coefficients, and reduced tendency for creep at low speeds. With their high positioning accuracy, these guides are particularly suitable for moving components that frequently start or change direction. The positioning accuracy of machine tools can be set to sub-micron levels. Additionally, it is advisable to appropriately increase the preload as needed to prevent the steel balls from slipping, ensuring smooth motion and minimizing impact and vibration during operation. Moreover, compared to fluid lubrication on sliding rail surfaces, miniature linear guides experience less wear; however, motion accuracy errors caused by fluctuations in the oil film are unavoidable. In most cases, fluid lubrication is confined to boundary regions, making direct metal-to-metal contact and associated friction inevitable. In such frictional conditions, a significant amount of energy is wasted due to frictional losses. By contrast, rolling contact involves much lower frictional energy consumption, and frictional losses on the rolling surfaces are correspondingly reduced, enabling rolling linear guide systems to maintain high precision over extended periods. Furthermore, since lubricating oils are rarely used, the design, operation, and maintenance of machine lubrication systems become remarkably simplified. These guides are well-suited for high-speed applications, significantly reducing the required drive power. Machines equipped with rolling linear guides exhibit low friction resistance. Consequently, the power sources and power transmission mechanisms can be downsized, driving torque is greatly reduced, and the overall power requirement of the machine is lowered by 8%.

2022-12-12

30

2022-11

What should we do if the miniature guide rail rusts?

Metal corrosion is the primary cause of failure in miniature linear guides. Especially during hot weather, sweat from the operator’s hands can also lead to rusting of the miniature linear guides. Therefore, miniature linear guide manufacturers recommend avoiding direct hand contact with the guides during operation. Human sweat is a colorless, transparent, or pale-yellow liquid containing salts and exhibiting weak acidity, with a pH value ranging from 5 to 6. In addition to salts of sodium, potassium, calcium, and magnesium, human sweat also contains small amounts of organic acids such as urea, lactic acid, and citric acid. When human sweat comes into contact with metal, it forms a thin sweat film on the metal surface. This sweat film can trigger electrochemical reactions on the metal surface, leading to corrosion. To prevent miniature linear guides from rusting, always wear gloves, finger cots, or use specialized tools when handling them. Currently, the issue of miniature linear guides rusting highlights our insufficient understanding of how to properly handle these components. Generally, miniature linear guides are coated with an anti-rust oil at the factory. So why do they still rust? The answer lies in the fact that many users, after finishing their work, simply store the guides directly in warehouses without taking additional protective measures. After using a miniature linear guide, it’s essential to apply another layer of anti-rust oil. Don’t assume that the factory has already applied sufficient oil—unfortunately, anti-rust oil tends to evaporate relatively quickly. Store miniature linear guides in a warehouse at room temperature, keeping them away from corrosive substances and ensuring that unused guides are not stored underground. This is because anti-rust oil evaporates more rapidly underground.

2022-11-30

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