KOMPAS-3D v23

Initially, immediately after insertion into a model, a component can arbitrarily move in the model coordinate system.

As a result of the positioning mating overlaid, the component loses some of its degrees of freedom. For example, if you establish the coincidence of a part face with the plane, then the part will be left with three degrees of freedom: two degrees of freedom of movement and one degree of freedom of rotation.

It is recommended that after applying all the positioning matings, the components become fixed in the coordinate system of the model containing them.

In the Design Tree, the following icons are used to indicate whether a component can move in the model’s coordinate system:

 — a fixed component (for more details on fixing components, see Chapter Components fixing),

— a component fully defined by positioning mates, i.e., having no degrees of freedom in the model’s coordinate system,

 — not a fully defined component.

An icon appears in front of the component name.

If all components included in a component group, a branch of similar components or a Components section, have the same state (either fixed, or fully defined, or not fully defined), then the corresponding designation is added before the name of the group / branch / section.

The following objects are fixed in the model coordinate system:

•fixed components,

•fully defined components,

•objects belonging to the assembly, i.e. the model as a whole, and not to any of the components (these objects are at the first level in the Design Tree).

If one of two mating components is fixed, then the mobility of the second component (and, consequently, the possibility of its subsequent mating with other objects) is limited more than if it were mated with a "free" component.

If both components are fixed, for example, because of previously overlaid matings, then the mating is created and immediately marked as invalid. When components are fixed, the mate is created as excluded from calculation.

You cannot mate objects belonging to the same component: this would require the independent movement of objects inside the component, while it moves in the model coordinate system as a whole.

You also cannot create a mating for two assembly objects. For example, you cannot establish the coincidence of two axes that are objects of the assembly, even if they go through edges or vertices of different parts.

The specifics of mating instance components of the array

The instance component of the array can mate with:

•an assembly object, for example, an auxiliary plane, solid, constructed in the assembly, etc.,

•another assembly component, including a component that is an array instance.

Location of array instances is specified by array parameters. However, the component instances - array by grid and array by concentric grid - when mates are imposed, they can change their position and/or orientation so that the mating condition is fulfilled, while the array parameters remain unchanged. This is achieved by the fact that when creating the coupling, not only the instance that is the coupling object is moved, but also the other instances of the same array and, if necessary, the source component of the array. The movement is performed if not prevented by previously created constraints.

Array instances of other arrays, for example, array along a curve, array by points and others, cannot change their position and/or orientation. Therefore, the creation of a correct mating is possible only if the second mating object can move. Otherwise, the mating will be created with an error.