Mechanism Simulation and Validation
Select Simulation tab to validate the mechanism's kinematics. Use the trackbar to change the axis coordinates or enter values in the input box manually.
Click Demo button to check all nodes.
Click Home button to return mechanism to Home position. Use Set As Home button to save current mechanism position as Home position.
Click Home button to return mechanism to Home position. Use Set As Home button to save current mechanism position as Home position.
If something looks wrong in the simulation, please check the mechanism's kinematic.
If you see nodes collisions, please check the 3D model elements.
Use 
button on the main toolbar to validate whole assembly.