About Animation Settings
You can set the timing and frame behavior of your animation, set assembly tolerances, and define the steps to take when a connection analysis fails.
Click 
Animation Settings. The Settings dialog box opens. Set the following options:
Animation Settings. The Settings dialog box opens. Set the following options:• Reconnect—Click the Issue a warning when the assembly fails to connect check box to display a warning message whenever the assembly fails to connect.
• Set Run preferences
◦ Click either Pause when analysis run fails or Continue when analysis run fails to set the action to take if a run fails. If you Click Pause when analysis run fails, a dialog box opens upon run failure. You can terminate or continue the analysis, and decide whether or not to view another warning if the analysis fails again.
◦ Click the Graphical display during run check box to update the display as you run an animation. When you clear the check box, the display does not change and calculation may be faster.
• Relative tolerance—The relative tolerance is the multiplier used by the system to scale the characteristic length and derive the absolute tolerance. The default value is 0.001, which represents 0.1% of the characteristic length of the model. Enter a new value from 1e-10 and 0.1, or click Restore default to reset the relative tolerance to 0.001.
• Characteristic length—The characteristic length is the sum of all part lengths divided by the number of parts. A part's length is the length of the diagonal across the bounding box that completely contains the part. Enter a new value or click Restore default to reset.
 | • The relationship between absolute and relative assembly tolerance is determined by the following formula: relative tolerance x characteristic length = absolute tolerance. • If the part sizes in your mechanism vary significantly, or results seem incorrect, you may need to change a setting. If the characteristic length does not properly represent the mechanism's moving parts, consider changing it. For example, if you are interested in the motion of a small rigid body in a large assembly, change the characteristic length so it is closer to the length of the smaller rigid body, or adjust the relative tolerance. Alternatively, you can specify the absolute tolerance directly in the assembly |