After we tried to add bracket or make die-casting mockup. We found that the vibration problem is still there. The difference between sheet metal and die-casting is their are not on the same level. The only strong structure of base is add bracket to link vertical with base and keyboard garage with linkage. This solution is impact ID and customer can not accept. Currently, we are going to change design to die-casting strucure but we still can not make a chassis without vibrating.
In fact, even we can have a strong chassis like dummy base. The weakness will become arm link with display. This portion is more diffcult to solve. :-(
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