What can lead to constraints flying apart during a simulation?

There are a few reasons that constraints may fly apart during a simulation:

1. An Inconsistent Constraints / Physical Instability warning states that "Some constraints may be ignored". If this warning (or any other warning other than a Redundant Constraints warning) is ignored and the simulation is allowed to continue, some constraints may be ignored and they may therefore fly apart.

2. The constraint has an Active When statement such that it "lets go" when a certain condition is met. To verify, open the constraint's Properties window and select the Active tab. If 'Always Active' is not checked (though it always is by default), select it to eliminate the Active When statement.

3. The constraint is Split. If the icon for a constraint has a blue slash through it in the Object List, that constraint is Split and will not have any effect on the simulation. To Join a Split constraint, right-click on it and select Join.

4. Dynamically Stiff Systems may cause constraints to fly apart when a simulation is run.

5. A Fixed Integration Step may disallow body velocities and positions to be accurately computed (particularly for Dynamically Stiff Systems). If this is the case, decreasing the Integration Step or switching to a Variable Integration Step may solve the problem. See How should Simulation Accuracy settings be modified?

6. A Configuration Error that is set too large may cause constraints to fly apart during a simulation. Decreasing the Configuration Error eliminate the problem. See How should Simulation Accuracy settings be modified?

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