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element.
2.7 Modelling of equipped parts with multiple representations
Example: equipped rod
TBD
2 instances of same part
positioned in the assembly
AIRBUS AP2255
3D modelling rules for CATIA V5
Issue: Draft A1 Date: February 2002 Page 7 of 37
2.8 Symmetrical parts
Procedure for producing the geometrical model of symmetrical part:
• Create a new file .CATPart: File + New Part.
• Modify the name of the part (Properties) and save the file with the reference of
the part -201.
• Open in same session the file of part -200.
• Copy the solid into the document -200.
• Paste the solid into document -201 (Paste Special AsResultWithLink).
• Produce symmetrical solid in relation to the symmetry plane. If this plane is
specifically defined in part –200, previously import this plane into part –201
(Copy / Paste Special + AsResult).
• Assemble the main part body "PartBody" and the copied solid (Insert +
Boolean Operations + Add).
• Position part 201 in the assembly.
Caution: Do not copy / paste part –200 in a CATProduct.
Advantage: all changes to part -200
will automatically be taken into
account for the symmetrical part
AIRBUS AP2255
3D modelling rules for CATIA V5
Issue: Draft A1 Date: February 2002 Page 8 of 37
2.9 Variant parts
Creation of a variant:
• Create a new reference -203 from part -200 (File + New from followed by Save
As).
• Make the modifications.
• Save.
• Replace, if applicable, part -200 by -203 in the assembly "Replace
component".
Remark: for a variant, "copy AsResultWithLink" is not used to access the specification
tree for the modifications.
2.10 Parts with complex surfaces
• Parts modelled with reference: during design, the surfaces (from Master
Geometry, of shape label) used for the modelling of the part must be
duplicated in specific open bodies. The designer decides whether the
modelling and/or surface modification must pass via the Shape Reference
Group.
Consult Chapter 4 Structuring of data in a CATPart.
• Part with unreferenced surface: the unreferenced surfaces created for the
modelling of a part will be grouped in a working open body. The designers
ensure full responsibility for the modelling of the surfaces that they produce.
Consult Chapter 4.2.2 Ordering various bodies in specification tree.
2.11 Conditions of supply
The conditions of supply are integrated into the definition dossier:
• Length / overthickness installed on aircraft: the length or overthickness is
integrated into the part solid, that is the main part body.
Example: for installation dispersion reasons and to ensure the minimum holeto-
edge distance of 10 mm, the part contour is drawn at 12 mm.
Minimum hole-to-edge distance 10 mm Part contour defined at 12 mm
Disadvantage: if a change to part -200 must be passed on to part -203, the
modification must be done manually.
AIRBUS AP2255
3D modelling rules for CATIA V5
Issue: Draft A1 Date: February 2002 Page 9 of 37
Specific case of so-called "internal" restrictions:
These restrictions are integrated into the solid defining the part, that is the
main part body.
• Length/overthickness adjusted on installation: the solid is isolated in a
secondary part body.
Example:
• Handling and installation lug: the solid is isolated in the secondary part
body.
Parts which are different once installed on aircraft but identical at storable part
stage must bear different references (part number) (File + New from then
modification of properties + Save as).
The drill-holes and bores are modelled at nominal diameter.
Unless specified otherwise on the drawing, the solid is represented with mean
dimensions.
Except in special cases, the following are not taken into account in the CAD
model: sealant or interfay thicknesses, protection thicknesses and part contact
face tolerances which lead to the upward adjustment phenomenon. This
upward adjustment is absorbed by the tolerance of the TDD on the external
shapes. For this purpose, the CAD model does not represent perfect
modelling at mean dimensions.
2.12 Drill-holes
TBD.
2.13 Removability volume
TBD.
2.14 Kinematic volume
TBD.
10 min after fitting
Solid in secondary part body
AIRBUS AP2255
3D modelling rules for CATIA V5
Issue: Draft A1 Date: February 2002 Page 10 of 37
3 Specific rules
3.1 Machined parts
Consult AP2257 Machined part modelling for CATIA V5
3.2 Sheet metal parts
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