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Problem during Dynamic simulation

ngdison

Newbie
Dear all people

I am a new person using Inventor. I got a problem wanted to get your advance.

I designed a 4th and 5th axis for CNC (Fig. 1). Now, I want to simulate it dynamically to find out vibration.
I can rotate the 4th and 5th axis manually (for sure). But when I open Dynamic Simulation, the tree does not show the Mobiles groups. The Grounded includes the 4th axis but (Fir. 2).
What did I do wrong?
Also, for dynamic simulation, I defined 2 shafts for the 4th and 5th axis as Rotational Joint. All mates were defined as Constrain. Am I correct?

Thank you very much
1.JPG
2.JPG
 

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