The first thing to remember is the first part selected will move
unless part 1 has more constrates that part 2. The thing that
needs a fix is the skeleton model. You really do want the
model moving around.
If the assembly has multiple sub-assemblies, first apply
constraints to the parts under the sub-assembly. Note that a
Fixed Constraint can be used in the sub-assembly to ensure the
parts won’t move in different or multiple directions. The
Fixed Constraint will not affect the upper level assemblies. Make
sure to activate the sub-assembly to apply constraints, as CATIA
will not automatically apply the constraints to the
If the assembly structure has multiple parts but no sub-assemblies,
apply a Fixed Constraint to the part that is not intended to move
(i.e. skeleton model). Then apply other constraints from the moving
part(s) to the fixed part. The fixed constraint is just to ensure
the primary part remains stationary.
Whenever constraints are being applied, the user can
“build” the assembly by using Update All.
This will verify that the direction is correct, or if the
constraint is correct for the scenario. Then use the Undo button to
undo the constraint on the part(s).
A rigid product (CATIA default) is an assembly of parts that, in
terms of building the assembly with constraints, will use the
assembly as a whole. If the sub-assembly has constraints, those
constraints will act as normal but the upper level constraints will
apply to the entire sub-assembly.
A flexible product is an assembly of parts that, in terms of
building the assembly with constraints, will use the individual
parts under the sub-assembly. Parts under a flexible assembly still
require constraints to be built under the required
If the sub-assembly has constraints, those constraints will act as
normal but the upper level constraints will apply to the individual
parts and build accordingly with Degrees of Freedom. To switch the
product from a rigid assembly to a flexible assembly, right-click
on the assembly and highlight the Product1 object and select.
Publishing geometrical elements is the process of making
geometrical features available to different users. This operation
is very useful when working in assembly design context. This
process provides a greater level of constraint usability than to
The Constraints Analysis dialog box that appears displays all the
information you need. The Constraints tab contains a detailed
status of the assembly: the number of non-constrained components
and the status of the defined constraints.
Electro-Mechanical Engineering (EME) Product Committee
2015 COE BJ Fries Award of Merit Recipient