In the selection of a worm gear screw jack, the lead of the screw plays a critical role in determining the performance of the system. A larger lead means that the screw produces a longer linear displacement per revolution, which results in higher lifting speed and improved transmission efficiency. However, this also leads to weaker self-locking capability, making the system prone to back-driving and often requiring an additional braking device. Moreover, screw jacks with larger leads generally have lower load capacity and reduced positioning accuracy, making them more suitable for applications where high speed and efficiency are prioritized.
On the other hand, screw jacks with smaller leads operate at lower lifting speeds and lower transmission efficiency, but they provide stronger self-locking capability, higher positioning accuracy, and greater load capacity. They can reliably hold loads in place after stopping, which is particularly valuable in heavy-duty or precision applications. For this reason, small-lead screw jacks are commonly used in scenarios requiring heavy load handling, precise positioning, or self-locking, such as mold adjustment or clamping systems. In contrast, large-lead screw jacks are preferred in applications where fast lifting and high efficiency are needed, such as automated production lines or lifting platforms. Therefore, choosing the proper screw lead is a key factor in ensuring that the worm gear screw jack meets the specific requirements of an application.