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why are there three red key when i calculate my

Question asked by hua zhao on Mar 31, 2011

I am learning a book called motion simulation and mechanism design with cosmotion 2007. But when i go through the seven chapter, I could not get the right result expected.  I am especially perplexed by the red key points on the timeline under a free movement. Because I thought a part must be not able to move when there is a red key point on its timeline. And also, the graph of the reaction force of the concentric 3 is not the one in my textbook. Finally, it could get  any result with a message "

Errors found parsing command. Command ignored.
Errors found parsing command. Command ignored.
Simulation can not continue.
"when i re-calculate the simulation again.  I very appreciate your help.

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