Because the simulation is of a high speed device, modify the simulation properties.
Set simulation options
As the Motor component drives the bevel gear, the remaining parts in the kinematic chain respond.
The direction of gravity has nothing to do with any external notion of "up" or "down," but is set according to the vector you specified.
Also, because we have not yet specified any frictional or damping forces, the mechanism is lossless. There is no friction between components, regardless of how long the simulation runs.
For more information | Location |
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Tutorial | Simulation Assembly Motion and Loads |