Sliding screw pair can also be an excellent alternative to ball screw

I often find that people have misunderstandings or even lack of understanding on the difference between ball screw and sliding screw. They think that sliding screw is of poor quality and low precision and is not suitable for linear transmission applications.

The lead precision of many sliding screws can reach the quality of grinding screws, especially the precision rolling forming sliding screws, such as the kind produced by Changjing Company, coupled with nut parts made of engineering plastics, have been able to exceed the service life of ball screws. Just pay attention to the automotive industry, you can find that there are many modern synthetic materials available, which are fully suitable for the above-mentioned work requirements. The sliding screws and nuts produced today are better than ball screws in many ways.

It is true that ball screws can cope with higher design loads and have high transmission efficiency. However, in many applications where loads are lower and customers are more concerned about reliability and repeatability, sliding screws can be a good alternative. In some applications, the lower transmission efficiency instead becomes an advantage of the sliding screw. In vertical lifting applications or where the designer does not want the screw to be back-driven, the sliding screw can hold the load in place without using a motor with a brake device or an additional brake device in the system. In principle, as long as the lead is less than the 1/3 of the screw diameter, the above-mentioned self-locking condition can be established.

Due to the lower transmission efficiency, the torque requirement of driving the sliding screw will be higher, so a motor with greater torque is required. However, this is only one aspect of the cost structure. As long as you take into account the higher unit cost of the ball screw, maintenance, lubrication and its adverse effects, the braking device to prevent reverse drive in vertical lifting applications, and the elimination of reverse clearance. The optional nut and other factors are taken into account, then the overall cost and advantages of the sliding screw are enough to show.
 
The diversity of evergreen nut materials can effectively improve the flexibility of design. The selection principle of sliding screw nut material can be based on temperature conditions, operating PV (pressure-speed) value, anti-wear life requirements, operating environment, cost and other factors. For example, the available material characteristics include: temperature allowable range from -50 ℃ to 150 ℃, available PV value up to 60,000psi-fpm, which can provide reverse clearance elimination capability of 10km cumulative working stroke, maintenance-free operation, and can be used in polluted and harsh environments.

In addition to the rich material selection, sliding screw nuts are also easier to complete than ball screw nuts for customized nut design. The backlash elimination mechanism can be integrated into the customer's design. In contrast, the constraint of space size is no longer a problem, because the sliding screw nut itself is easier to correct than the ball screw nut. By customizing the nut or mounting structure for the customer, other elements in the system can also be eliminated. Since the backlash can be eliminated by using the nut, the repeatability of the system can be improved, thereby improving the design performance.

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