HD12443: TOOLPATH COLLISION

APAR status

• Closed as Permanent restriction.

Error description

• Scenario 1:
  Open CATProcess1 (tool diameter: 10mm)
  In the tree unfold PO.1 / Manufacturing
  program.1 / Tool change
  Double click Multi-Axis Flank Contouring.1
  Replay
  An error window pops up:
  Tool path computation error.
  Probable error location:
  Drive element number: 3
  Axial level number: 1
  Radial path number: 1
  Impossible condition on the following surface
  A problem was found in the determining a final
  possition for
  the tool in relation to the following surface.
  Verify that you have not requested an impossible
  condition for applying the tool to the surface.
  *************
  Scenario 2:
  Open CATProcess2 (tool diameter: 6mm)
  In the tree unfold PO.1 / Manufacturing
  program.1 / Tool change /
  Manufac...
  Replay the toolpath: Collision with the part.
  *************
  Scenario 3:
  Open CATProcess3 (tool diameter: 12mm)
  In the tree unfold PO.1 / Manufacturing
                                    An error window pops up :
                                    Tool path computation error.
                                    Probable error location:
                                    Drive element number: 3
                                    Axial level number: 1
                                    Radial path number: 1
                                    Ending possition failure
  
  The system cannot possition the tool.
  Some possible reasons are:
  Failure on drive 1: check the start element, try a
  manual reference point and manual direction to
  start.
  Failure on drive 2: check the start element and the
  drives order.
  Failure on other drive: the curvature+thickness of
  the Corner
  is greater than the body radius of the tool.
  
  .
  

Local fix

Problem summary

• toolpath collision
  Scenario 1:
  Open CATProcess1 (tool diameter: 10mm)
  In the tree unfold PO.1 / Manufacturing
  program.1 / Tool change
  Double click Multi-Axis Flank Contouring.1
  Replay
  An error window pops up:
  Tool path computation error.
  Probable error location:
  Drive element number: 3
  Axial level number: 1
  Radial path number: 1
  Impossible condition on the following surface
  A problem was found in the determining a final
  possition for
  the tool in relation to the following surface.
  Verify that you have not requested an impossible
  condition for applying the tool to the surface.
  *************
  Scenario 2:
  Open CATProcess2 (tool diameter: 6mm)
  In the tree unfold PO.1 / Manufacturing
  program.1 / Tool change /
  Manufac...
  Replay the toolpath: Collision with the part.
  *************
  Scenario 3:
  Open CATProcess3 (tool diameter: 12mm)
  In the tree unfold PO.1 / Manufacturing
  program.1 / Tool change
  Double click Multi-Axis Flank Contouring.1
  Replay
  An error window pops up :
  Tool path computation error.
  Probable error location:
  Drive element number: 3
  Axial level number: 1
  Radial path number: 1
  Ending possition failure
  The system cannot possition the tool.
  Some possible reasons are:
  Failure on drive 1: check the start element, try a
  manual reference point and manual direction to
  start.
  Failure on drive 2: check the start element and the
  drives order.
  Failure on other drive: the curvature+thickness of
  the Corner
  is greater than the body radius of the tool.
  
  .
  

Problem conclusion

• THIS PROBLEM IS PERMANENT RESTRICTION IN CATIA
  
  Incident Diagnosis
  toolpath collision
  
  
  Restriction Explanation
  General comment on toolpath collisions:
  Almost faces selected as drives in FC5X are
  not ruled and therefore not fully flank millable...
  -> Isoparametric Machining with 89deg. tilt
  angle may be better solution.
  
  
  By-Pass
  3 main problems were openned :
  
  1/ Failure in toolpath computation (from left to right
  side)
  
  Comment about geometry :
  The 2 fillets have important counter drafts area.
  Drive.1 is really thin w.r.t. its height ( 30 mm).
  That is reducing the area to positionning the
  tool and make it difficult mainly in case of long tools
  
  Solution :
  => To define a maximum User Cutting length
  equals to the height of the drive (30mm)
  TP computation will succeed better
  
  2/ Collision on the fillet
  
  Comment about geometry :
  The fillet is concave (along its height) and not
  ruled therefore not 100% flank millable.
  To tune the Contact Height parameter allow to
  reduce the gouging in dividing it up the drive but
  will never avoid it.
  
  Solutions :
  => From R13: In FC5X, user can select a
  global guiding curve (e.g. the upper contour of the
  drive) and ask to stay on 1 side of this curve 'if
  needed' (i.e. in case of collisions)
  This will avoid collisions but some
  material will be left. May be used for roughing
  => Advice: To machine this kind of not fully
  flank millable surface with Isoparametric Machining
  for finishing
  
  3/ Toolpath computation from right to left side
  
  Comment about FC5X specifications :
  All geometrical elements selected as Drives,
  Parts or Start/End are ALWAYS extended for tool
  positionning.
  
  This case :
  We want to machine Drive.1 (U-shape) in going
  from Start to Drive.2
  Drive.2 extension break Drive.1 sooner than
  expected.
  
  Solutions :
  => 2 Design tips :
  A/ To split Drive.1 into 2 elements (to use 2nd
  element as end on 1st element)
  B/ To create a small fillet between Drive.2 and
  Drive.3 (to limit extension)
  => NC ERD : To provide V5-user the capability
  to select locally which (1st or 2nd) intersection
  between Drive.X and Drive.X+1 he wants to take
  into account. (As in Sequential Flank in V4-
  MFGProg : intersection number on CS)
  
  .
  

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