
This
task shows you how to apply a constraint with a relative positioning
that can be compared to contact. You can either select the geometry or the
command first.
This constraint can be created between either two elements. These
constraints are in priority:
 concentricity
 coincidence
 tangency
Use the contextual menu if you want to create other types of
constraints. 

Open the
Constraint_Contact.CATPart document. 


Select Contact Constraint
from the Constraint toolbar (Constraint Creation
subtoolbar).





Click a first element. For example, click a circle.

Click a second element. For example, click another
circle.




The Concentricity constraint symbol appears and the constraint is
created. 


According to the elements you select, a single type of
constraint is proposed for defining the contact:
 A point and a line: coincidence
 Two circles: concentricity
 Two lines: coincidence
 Two points: coincidence
 A line and a circle: tangency
 A point and any other element: coincidence
 Two curves (except circles and/or ellipses) or two lines:
tangency
 Two curves and/or ellipses: concentricity


Modifying or Deleting Contact Constraints
You can modify or even delete the contact constraint as follows:

Make sure either Constraint
or Contact Constraint
is active in the Constraint toolbar.

Rightclick the constraint you want to modify or delete.

Select the option corresponding to the desired operation,
from the contextual menu. For example, select the Distance
constraint type to turn the contact constraint into a distance
constraint.
The Distance constraint symbol and value now appear as shown here.

