Rigid group

 

 

 

This command creates rigid groups. A rigid group is a group of interdependent parts. When a joint is allocated to a rigid group, all the parts in this rigid group are involved.

 

Creation stages / Use:

 

Click the Rigid group icon or select the Mechanism > Rigid group... command from the drop-down menu.

 

1. Click the different entities to be inserted in the rigid group.

 

 

A "ghost" rigid group can be created. This is a rigid set that contains only one point or frame, allowing you to make an intermediate joint. For example. A is a rigid group that must be moved linearly and around an axis in relation to a rigid set B. F is a "ghost" rigid set. You can place a prismatic joint between A and F, and a pivot joint between F and B.

 

 

When we use a in place assembly in a mechanism, if all its parts are in the same rigid group of the mechanism assembly, then the in place assembly is added to this rigid group. If one of the part is not in a rigid group or if some parts are not in the same rigid group, then the in place assembly is not added to any rigid group, and you have to add it manually.

 

 

Additional information:

 

The system automatically creates a rigid group that cannot be deleted and will always be fixed while using the mechanism, which is the built rigid group. This can be empty if required.

 

Available Options:

 

 

The box allows to hide selected entities during the use of the command, to be able to select other entities more easily, especially those who were behind.

 

 

The box allows to modify the behavior of a rigid group when it is empty. If the option is checked and if all entities of this group are deleted:

  • If the Update heals is active, the rigid group is also deleted.

  • If the Update heals is not active, the rigid group becomes invalid.

 

 

Possibility to assign physical properties to a rigid group.

Values to define are the mass and principals moments (X, Y and Z) according to a principal frame.

 

 

Modification :

 

To modify a rigid set, use the Edit popup menu in the entities tree, in the Groups folder.