Linear guides are the part of the machine that is invisible as long as it is working properly. But once it fails, all the equipment turns into a source of waste, noise and downtime. And it's not just about natural wear and tear. Most often, breakdowns occur for reasons that could have been prevented even at the design or installation stage. Let's figure out why this happens and what needs to be done to make the guides last a long time.
Many enterprises face the same problem: the guides fail faster than the warranty period ends. And then there is the question of a replacement. Someone is looking for an analogue from familiar suppliers, someone is trying to restore old rails, someone orders directly from the manufacturer. But in order for the replacement to be successful, it is important not only to find the part, but to select it taking into account the operating conditions. If you decide to buy linear guides without prior calculation, there is a risk of getting a node that will not withstand the load or will not fit the dimensions. Therefore, it is worth consulting with a specialist before buying. It will help you determine the desired accuracy class, carriage type, and dirt protection.
Contamination and lubrication
The first thing that kills linear guides is dirt. And not just coarse chips or dust that is visible to the eye. The most dangerous are small abrasive particles: sand, ceramic dust, fiberglass. They penetrate inside the carriage, mix with the grease and turn into a paste that works like sandpaper. Each stroke of the carriage literally grinds the raceways.
Equipment in the food and medical industries has a particularly difficult time. There, the guides are constantly cleaned, disinfected, and treated with chemicals. Conventional lubricants are washed off, and aggressive substances get into their place. For such conditions, special hygienic guides are produced that can operate without lubrication at all. But if you use conventional ball guides with open tracks in such conditions, they will fail very quickly.
Lubrication is not just "to keep it from creaking." It separates metal surfaces, dissipates heat and protects against corrosion. When there is little lubrication, the metal touches the metal directly. This leads to accelerated wear, scuffing, and increased backlash. There is a characteristic creaking or clicking sound when moving, which is easy to notice.
But an excess of lubricant is not a solution either. Excess grease is squeezed out of the carriage, collects dust and dirt on itself and turns into the same abrasive paste. Manufacturers often specify standards: fill the bearing cavities by about a third, and not "heartily." In addition, different types of lubricants should not be mixed. Some compounds react
