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When a component exists in several instances in a project, creating a link (Link) with the original component allows it to be drawn only once. In this case, it is even more interesting to first encapsulate the component in an assembly container that will be specific to it (As_Wheel), outside the main assembly sAs_Axle. From a link, the Element Count property appears (the value 0 means that the link is the only instance of this link). If we replace 0 by 2, 3 ... we will have 2, 3 ... instances in total. We will then use in the main assembly only the link of this component in order to define the number (total) of instances necessary for the project by the ElementCount property.
Indeed, in the assembly container specific to the component, it is possible to define in advance the constraint Elements that will be needed later. After creating the Link and setting the number of instances, we can see that each instance has the Elements of constraint (obviously the same !).
Note that when creating constraints, FreeCAD (Link Branch version of Realthunder) automatically adds an identifier to the Constraint Elements that you named in the 1st step of this page (component encapsulation).
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