The ball screw uses the circular ball bearing to reduce the friction and improve the efficiency. The trapezoidal screw uses the low friction coefficient between the sliding surfaces. Therefore, trapezoidal screw is usually not as efficient as ball screw. By analyzing the mechanism of tribology, it can be found that the predictability of sliding friction is lower than that of the transmission with circular ball technology. The fatigue life equation (such as L10 life) is reliable in its application.

綜合以上，就可以知道滾珠絲杠和梯形絲桿是因為預測性能和壽命的能力有所差異，所以在應用領域也有很大的區別。

Based on the above, we can know that ball screw and trapezoidal screw are different in their ability to predict performance and life, so they are also very different in the application field.

雖然滾珠絲杠有著較多的優勢(負載、剛度、效率、負載循-環、可預測性)，但是成本比較高。

Although ball screw has many advantages (load, stiffness, efficiency, load cycle, predictability), but the cost is relatively high.

雖然和其它平移直線運動方案相比來說，它們的性價比很高，但是因為滾珠絲杠的設計比之復雜，需要經過-硬化處理的精密軸承表面以及一個滾珠循-環裝置。

Although compared with other translational linear motion schemes, their cost performance is very high, but because the design of ball screw is more complex, it needs a precision bearing surface after hardening treatment and a ball circulation device.

而梯形絲桿的尺寸很小，設計起來很靈活，在正常使用的情況下噪音很小，耐腐蝕性能好，可以為了滿-足垂直應用需求而配置自鎖功能。它們在很多應用領域發揮著重要作用，當然本身也有一些限制。

The trapezoidal screw has small size, flexible design, low noise and good corrosion resistance in normal use. It can be configured with self-locking function to meet the requirements of vertical application. They play an important role in many application fields, but they also have some limitations.