一个必需组装步骤是万向架单元卡入到位于四元的底部。
The one required assembly step was to snap the gimbal unit into place on the bottom of the quad.
最上面的位置指令万向架倾斜相机向上，而底部位置发送它在另一个方向。
The uppermost position commands the gimbal to tilt the camera upwards, while the bottom position sends it in the other direction.
分析了球笼式等速万向节保持架外球面切入磨削误差产生的原因，并提出解决和调整方法，从而进一步推导出调整计算式。
The reasons for error cut-in grinding of cage spherical outside surface of ball basket constant velocity joint is analyzed, and the solution for the problem is put forward.
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