KOMPAS-3D v23

2.Specify the plane of symmetry – a flat face, an auxiliary or coordinate plane. The selected plane will be highlighted, and its name will appear in the corresponding Parameter Toolbar field.

3.Specify the first and the second objects to be placed symmetrically.
You can specify various types of objects — point objects, straight-line objects, flat objects, axes, coordinate systems, components as a whole (components and coordinate systems are specified only in the Model Design Tree).
In addition, you can specify cylindrical, conical, spherical, toroidal faces, if the parameters of their theoretical surfaces coincide, as well as edges in the form of arcs or circles, having the same radii.

•A mating can be created if objects of the same type are selected, therefore, when selecting the second object, only objects of the same type as the first one are available.

•The following should be noted about symmetric placement of certain types of objects. For example, if you select flat objects, the planes belonging to them are placed symmetrically. More details on the specifics of mating for objects of various types

After you specify the objects, their names will appear in the Object 1 and Object 2 fields. The model will be rebuilt so that the position of the mating objects meets the mating condition. The position of the corresponding components will change.

If the existing matings or fixing of components prevent rebuilding, the position of the components remains the same. A mating is created, but marked as invalid or excluded from calculation. For more details, see sections Principles of overlaying matings and Components fixing: Overview.

You can select mating objects before invoking a command as well.

If there are planes or flat faces among these objects, then the first one becomes the plane of symmetry of the operation.

4.If components are specified as mating objects, you can customize the mating direction and parameters of mutual placement of components.

5.To complete creating the coupling, click Create Object in the Parameter Panel header.

After that, the mating is overlaid on the specified objects, and the corresponding icon appears in the Feature Tree.

6.To complete operation of the command, click Finish .

Mating Symmetry applied to component objects does not always ensure the necessary positioning of these components within the assembly. In order to get the desired position, you can:

•create additional matings for other pairs of component objects,

•choose other component objects for this mating,

•for a mating, specify components as a whole rather than component objects.

The Symmetry conjugation is created automatically when adding a component by mirroring. It is overlaid on the source and mirrored components. Note that this mate is created in all cases except mirroring the component using the Symmetric component placement method with placement by the base component. In this case a dependent positionis created.

Using specified parameters when creating matings of the same type...

Mating direction

The concept of mating direction is that one of the mating components (the leading one) affects the position of another (the driven one), limiting its degrees of freedom.

If the model components are specified as mating objects, you can select the mating direction. In this case, the Parameter Panel contains the Mating Direction group of buttons. The following options are available:

Automatically — the leading object is determined by the system; this option is selected by default,

Object 1 limits object 2 — the first mating object is the leading component,

Object 2 limits object 1 — the second mating object is the leading component.

Click the button corresponding to the desired option.

If the Symmetry constraint is created automatically when adding a component by mirroring, the original component is automatically selected as the leading one. At the same time in the Mating Direction the Object 1 limits object 2 button is pressed.

Parameters of component placement

If the model components car selected as mating objects, and the coordinate systems of both components are either right-side or left-side (see Right-Side and Left-Side Coordinate Systems), then the component placement method and parameters can be changed. In this case, the Parameter Panel contains the Configure button.

To complete the setup, click this button. This will start the configuration of the component placement settings.

By default, the placement method is Mirror . You can choose a different method – Place symmetrically and configure its parameters.

The parameters of the relative position of the mating components are configured in the same way as the parameters of the component of the mirrored version relative to the component of the original version (see section Changing the Component Mirroring Parameters). All positioning options are available, except for by the main component position.

When changing the placement parameters, one of the mating components changes its position in the graphic area of the model. This can be either the first or second mate component, depending on the additional constraints imposed on the components.

To complete the setup, click Create Object on the Parameter Panel header. The system will return to the mating creation process.

Types of mating objects. The specifics of mating for objects of various types

Objects of various types can be specified as mating objects. The types of objects and the specifics of creating the Symmetry relationship are provided in the table.

Types of objects to mate for Symmetry

	Object types	Result of mating
	Components as a whole	If the coordinate system of one of the mated components is right-sided, and the other is left-sided (for example, when one of the components is a mirror image of the other), then the components are placed mirror-wise, i.e., their coordinate systems are mirror-symmetrical relative to the plane of symmetry. If the coordinate systems of both components are either right-side or left-side, the components are placed using the Mirror method, so that the X and Y axes of their coordinate systems are mirrored, while the Z axis is determined according to the type of the coordinate system (right-side or left-side). If needed, you can change the component placement method to Place symmetrically and set the placement parameters for this method. Details...
	Component and/or assembly objects
	Point objects	They are placed symmetrically relative to the plane of symmetry.
	Straight-line objects (including axes)	They are placed so that the straight lines with which the objects coincide are symmetrical relative to the plane of symmetry.
	Flat objects	They are placed so that the planes to which the objects belong are symmetrical relative to the plane of symmetry.
	Coordinate Systems	Absolute or local coordinate systems are mirrored of one of them is right-side and the other is left-side. If both coordinate systems are either right-side or left-side, they are placed in a way so that X and Y axes are mirrored relative to the plane of symmetry. Z axis direction for each coordinate system is determined according to the type of the coordinate system — right-side or left-side.
	Cylindrical faces	Construction is possible if parameters of the theoretical surfaces of the specified faces coincide. Cylindrical faces are placed in a way so that their theoretical surfaces are symmetrical relative to the plane of symmetry.
	Conical faces	Construction is possible if parameters of the theoretical surfaces of the specified faces coincide, with account of cone bases (diameters of large bases should be equal) and face construction specifics. Conical faces are placed in a way so that the axes of their theoretical surfaces and cone vertices are symmetrical. For correct construction, it is recommended to use faces of components that are insertions of the same model, or faces with the same parameters constructed in the same way.
	Spherical and toroidal faces	Construction is possible if parameters of the theoretical surfaces of the specified faces coincide. If the faces are whole spheres (tori), they are places symmetrically relative to the plane of symmetry, if they are not, they are placed in such a way so that their theoretical surfaces are symmetrical.
	Edges in the form of arcs or circles	Construction is possible if edges have the same radius. The edges in the form of circles are placed symmetrically relative to the plane of symmetry, and in the form of arcs — in such a way so that the circles with which the arcs coincide are symmetrical.

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KOMPAS-3D v23