Assembly line operation is not fast or good. Its movements must have added value. Therefore, it depends on whether the movements are brief and concise. Therefore, the concept of economic principles of movements is required. In short, the movements of human hands can be divided into movements. , Grasping, spreading, prepositioning, assembling, applying, dividing, there is also a kind of mental energy function. Strictly speaking, only two actions have added value: assembling and applying, so it can meet the requirements of production Next, try to eliminate or simplify other actions.