HC95142: SKETCHER / CONSTRAINTS / CONCENTRICITY BETWEEN CIRCLES AND COINCIDENCE BETWEEN CIRCLES CENTERS ARE NOT OVERDEFINED

APAR status

• Closed as Permanent restriction.

Error description

• SCENARIO FROM SCRATCH :
  -----------------------
  1) Open new part and create sketch
  2) Make two distinct circles(`circle.1`and `circle.2`)
  3) Create Constraint with `coincidence` between the center
  of `circle.1` and `circle.2` ; OK
  4)  Create Constraint with `concentricity` by selecting
     the arc of the circle of `circle.1`and `circle.2` ; OK
  -->  `coincidence` and `concentricity` should be
  overdefined.
  .
  For instance, by creating a distance constraint of 0mm
  instead of coincidence constraint at Step.3, the sketch
  cannot be updated correctly, and constraints are seen
  overdefined as expected.
  

Local fix

Problem summary

•  INCIDENT DIAGNOSIS:
  Concentricity between circles and coincidence between circles
   centersare not over defined .
  .
   TECHNICAL EXPLANATION FOR THE RESTRICTION:
  The variational solver used by Sketcher is able to analyse the
  constraint schema and it doesn't set the geometrical
  constraintsas over-defined if the system is consistent
  (constraints verified).
  .
  This capability is available for geometrical constraints
  (parallel, perpendicular, coincidence,...) but not for
  dimensional constraints (length, distance, angle).
  .
  In this case, having over-constraint with a distance
  constraint of 0mm and having no over-constraint with a
  coincidence constraint is the right behaviour.
  
   BY-PASS:
  It's a very powerful behaviour that the system automatically
  avoid over-constraints when the geometrical constraint (not
  dimensional) specifications are consistent (verified).
  This capability allows you today to put a distance between
  two vertical lines or a distance between two parallel lines
  for example.
  

Problem conclusion

• THIS PROBLEM IS PERMANENT RESTRICTION IN CATIA
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels