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Swinging arms affect chinese connection

Led die bonder used for bond lead frame and chip is one of the key equipment of led production line. The swing-arm is an important component of led die bonder and its dynamic characteristics will directly affect the piece accuracy. At present, the accuracy and efficiency of led die bonder are limited because of the vibration of the swing-arm. In solving this problem, a three-dimensional finite-element model for swing-arm is built to provide analytical frequencies and vibration modes.
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Trebuchet - Wikipedia

It was a common powerful siege engine until the advent of gunpowder. There are two main types of trebuchets. The first is the traction trebuchet , or mangonel , which uses manpower to swing the arm. It first appeared in China in the 4th century BC.
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Introduction Did you know that playground swings can provide a good lesson in physics—as well as lots of fun? The back-and-forth motion of a swing is an example of a pendulum. We see pendulums in other areas of our lives as well, such as in grandfather also known as longcase clocks.
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