28869789 Catia Queries

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QUESTIONS ON CAD

1. What is Geometric Modeling? Classify it.

Geometric Modeling is the process of generating three-dimensionalobjects of the real world for the purpose of analysis, design, draftingand manufacture.Geometric Modeling creates a database in the computer, whichrepresents the object generated. This object database is used to displaythe object, to prepare drawings of the object with different views, to

prepare data for analysis and design and also to manufacture theobject using CNC machines.Classifications of Geometric Modeling:In general, there are three types of models commonly used torepresent physical objects. They are:1. Wireframe Model

2. Surface Model3. Solid Model

2. What is the advantage of surface modeling over wireframe modeling?

a) Wireframe models are the simplest among the three types of models.They are easy to create and use. They are generally used to createmodels of simple objects.In surface modeling, not only simple but also even complex shapescan be generated by combining Planes, ruled surfaces of revolution, sweep surfaces and fillet surfaces.

b) Surface models define part geometry more precisely, as comparedto the wireframe model, and can be used directly to generate path

profile data for NC machines.But Wireframe model does not distinguish between inside andoutside of the surfaces of the object and they are inadequate to beused for generating cutter paths to drive NC machines tomanufacture the object.

c) In Surface modeling, Techniques like hidden surface removal andhidden line removal makes it possible to display the objects as asolid object and viewed from any point.But these techniques are not available in the wireframe modeling

3. What are the different drafting standards?4. List out the various drawing sheet sizes.5. What is the use of Grid Reference System?6. What is Item Reference Number?

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7. Explain briefly the following.a) Assembly Drawing

b) Sub assembly drawingc) Detail Drawingd) Part Drawinge) Production Drawingf) Machine Drawing

8. List out different type of lines used in drafting

CATIA Basics

Working With A Session:1. A Session is defined by a set of models and a SESSION MANAGER.2. The SESSION MANAGER configures a CATIA session and manages

the data accessed by the user.3. Working with a session is working in context; this allows you to visualize

your digital mock-up and to perform various simulations.4. A session is stored in a SESSION-type file. It must be considered as atemporary work environment save.

5. No data transfer capability is provided on a session.

Hints & Tips:1. When a model has been once active, you can see a (emptyset symbol)

or ( ) at the end of the model name in the Window Menu Bar.

2 Displaying the working plane parallel to the screen on workstation:Select view+current 2D plane or key in p to work in the current 2D plane

3 Warning about Circles : Circles are created in CATIA with a break point

located at the 3 O’clock position. i.e while creating limit points on circle,one centre point and another point at 3 O’clock position will be created.

4 Methodology- Visualizing different thickness :If we cannot visualize the different thickness on the screen, display the

localTransformation window with the STD option and set the thicknessoption to ON.

2 Forcing colours : During the design phase, we may want to highlight anareaof our part. The colour forcing option allows us to force the same colour onto the elements.

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6. About the Colour Palette: Activate the local transformationwindow(PF4 key or Mouse buttons 1 and 3) select COL option. The colour palette has twozones:The first six boxes manage the colour of the CATIA graphics screen.The others manage the palette of available colours in model

7. Creating Standard Model: To avoid having to customize modelstandards eachTime while creating a new part, we can create a standard model for which we set the standards we need before saving it for subsequent use.Then each time when we need a new model, we read the standard modelinstead of creating a new one.

8. Selection: while selecting a contour or profile, we can use *SEQ or *PRF instead

Of selecting all the contours or pressing Autosearch.

9. Applying Filters: The filter we apply is supposed to let us see thegeometry only, but we can see the axis system even though it is on layer 0. The current layer is always displayed. If we create geometry, we createit in the current layer. We have to be able to see the elements we arecreating. To be sure to display only the geometry we want, ensure thatthe current layer is an empty layer.

DITTO:An image (or occurance) of the geometric elements of a detail which

is transferred into another workspace is called ditto.A ditto can be used as a single element, but its constituent geometric

elements can be used for further creations in the receiving workspace.If the geometric elements of the initial detail are modified, all the

dittos are automatically updatedThe ditto mode is useful:1. To keep a subset independent from the rest of the model2. To place several identical subsets in the model, while creating them only

once in the model (memory space saving)3. To allow easy modification of a repetitive subset. Such a modification isapplied to each occurrence of the model

Applns.: Mainly used in designing1) Piping and

2) Tubing

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1. What is the abbreviation for CATIA?

2. What is the extension for a CATIA file system?

3. What is the operating system on which CATIA work?

4. CATIA can be used for a) only 3D modeling

b) only 3D modeling and analysis.c) 3D modeling analysis, simulation and integrated appliationd) none of the above.

5. What is the difference between crv and ccv.

6. What is meant by wire frame modeling.

7. What are Boolian operators? Name a four boolian operators.

8. How CATIA is divided in to?

9. What is a 2D profile?

10.What is the difference between models and files in CATIA.

11.How do you activate the alphanumeric window in CATIA.

12.What is a primitive ? what are the basic type?

13.What is a surface element?

14.What is the difference between surface modeling and solid modeling.

15.Give the expansion for the following.#IGES#STEP

#STL#DXF16.Difference between surfaces,faces and skin?

17.What is meant by volume element?

18.What are the two working modes in CATIA?

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19.Name the basic features which are mostly used in CATIA solidmodeling?

20.What is CSG tree and give its expansion?

21.A node in a CSG tree represents___________ 22.A terminal branch in a CSG tree represents_____________ 23.How to access CSG tree?

24.What does LPFK stands for ? Explain briefly?

25.Give the expansion for :-#NHR #HLR #SHD modes

26.What is the max number of layers in CATIA? Which is the default first

layer.

27.What are NURBS? Give its expansion?

28.What are the things to be considered before starting a 3D modelingwork?

29.What is the hierarchy of making a complex solid design?

30.Give the multi select option for a face, surface, volume and skin.

31.What is a master workspaces? How do you create aditional workspaces?

32.____________ switch is used to change the current workspaces?33.Differentiate between dittos and details.

34.What is functional surface?

35.Intersection of two functional surfaces are called____________

36.Differentiate between neutral and parting element in a draft.

37.Differentiate between cliff and rolling edge?

38.What is Dynamic sketcher? Where is it used?

39.Use of compass in DS.

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40.Sketcher colours convey a different meaning than the same colours inCATIA,name the color and explain.

41.Type of dim constraints available in DS?

42.What is the difference between connect and corner under surf1 function?

43.What is planer face? How does it differ from face created from surace?

44.How does surf2 function differ from surf1 function?

45.How does surface element represented in CATIA?

46.What is constraint element in CATIA?

47.What is spline element?

48.Can you isolate a parameterized geometry in CATIA?

49.How will you break a parameterized relationship in CATIA?

50.What is meant bye local parameterization?

51.Explain briefly about the command paramlink?

52.Parameterizing a geomentric element consists of #Evaluating its cahrectristics#Adding relationships.#Modifying the dimensions.#Both(ii)&(iii)#Both (I)&(ii)

53.What is the purpose of feature based design?

54.Explain briefly about the commands used in FBD?

55.Explain briefly about the various start functions in CATIA?

56.What is local function window? Explain briefly.

57.What are the constraints available in assembly modeling ?

58.How is the window divided in assembly?

59.What are the contextual commands available on constraints?

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60.What are the contextual commands available on parts?

61.What is the extension for the assembly file ?

62.Constraints in assy is highlighted in 3 color. explain.

63.What are the parameters that can be defined by a law?

64.What are the different curves required to define a radius law?

65.What are the 4 principal stds available in CATIA for dim

66.Diff. Between CLIP & BREAKOUT in auxview2.

67.What is the use of LOCK in drafting?

68.Difference between TEXT & TEXTD2 (OR) AUXVIEW &ALIXVIEW?

69.Use PACK in ERASE command.

CATIA QUESTIONS AND ANSWERS

1. What is CATIA? What are the different modules of CATIA? What arethe main Features of CATIA?

CATIA: Computer Aided Three Dimensional Interactive ApplicationIt is used to create three-dimensional geometric models using

wireframe, surface, and solid modeling constructions.Additional application modules incorporated with CATIA provide

capabilities for:• Kinematics• Robotics• FEM mesh generation• FEM solutions• NC Mill• NC Lathe Programming• Piping Design• Structural Member Design and• Image Generation

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Additional Modules allow data exchange between CATIA andother applications and provide an interface to the internal CATIAmathematical routines and user interface.Main Features of CATIA are:

• Maintains a full three-dimensional data base• Allows direct construction of 3D Wireframe and SolidModels• 3D space elements & 2D draw elements can co-existsimultaneously in the same model• Automatic generation of machining instructions to drivean NC tool• Geometry interface which can accept geometry fromother systems and analysis programs as well as extract datafor delivery to other systems• Kinematic module which simulates the movement of partis space• Robotics module to simulate a robots workenvelope

2. What are the relations between SURFACE, FACE, SKIN andVOLUME?

SURFACE:• A Surface is an infinitely thin, mathematically defined contoured

area in space. It is displayed visually by isoparametric curves and boundary curves.

• In simple terms a surface is an entity that has length and width, but

essentially no thickness.• In CATIA Surface is a Parent element for Face and Skin.

FACE:• It is a portion on a surface defined with curves as boundaries or it

is a portion in a plane defined with curves or lines as boundaries• Face is a child of Surface.

SKIN:•

A Skin is a set of joined faces, surfaces, skins, or volumes, similar to the volume, but with a single domain and without closurecondition.

In addition, an offset can be associated with each of the faces.• Since Skin is derived either from surfaces or faces, hence it is also

a child of face or surface.

VOLUME:

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• A Volume is a set of joined faces or surfaces or skins or volume,with total closed domains.

• While creating Volume the order of selecting the faces isimportant.

Also a Volume can have an inner domain.

3. What is the difference between SOLIDE and SOLIDM?SLNO.

SOLID EXACT SOLID MOCK-UP

1 Exact Solids manipulatesan exact type, that is, anon-approximatedBoundary Representation

Mock-up Solids manipulates anapproximated type B-Rep, that is,a representation resulting from anapproximation of the non-planar forms by planar facets

2. They are distinguished by

having precisely definedsurface definitions.

They incorporate surfaces that

are approximated using discrete planar facets

3 They can be used for allother CATIA operationsincluding NC

programming

They can be used effectively for object visualization, constructingmockups to validate assemblyoperations or for kinematic,dynamic and FEM analysis

4. These models haveapplications in more

artistic situations withhighly contoured surfaces Note: All curves aredisplayed as polylines withdecretization beingdetermined to achieve themost realistic appearancewithout excessivecomputational effort

These models are simple but areof little value for applications

requiring precise surfacedefinition

4. What is the difference between PRIMITIVE and FEATURE?PRIMITIVE :It is generally the simplest solid element that can be create.The three types of primitives are:

a) Canonical Primitives--- 1) Defined by geometric values:---Parallelepiped---Cylinder ---Cone---Sphere

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---Torus2) Defined by a contour and geometric

values :---Revolution: element obtained by

rotating an open or closed profile about an axis

---Sweep: element obtained by slidinga

contour along a spine while thenormal to the contour plane remains

parallel to the tangent to the spine

a) Complex Primitives--- These are SOL type elementsobtained:

* from VOL type elements* from Skin surfaces or non-planar

faces by-- closing through offsetting the samesurface

-- closing through projection onto a plane

-- closing using planar faces

b) Macro Primitives --- Macroprimitives are SOL typeelements

obtained from dittos (DIT typeelements).

The corresponding detail has SOL typeelements itself.

FEATURE :1. A Feature is a set of user defined technological object

consisting of:• a geometry• a Parametric definition and• technological attributes

2. Normally, features are characteristic details of a part that have astrong correspondence or linkage to a particular manufacturing

process(Ex: a counterbored hole, a boss around a hole, a pocket)

3. Features are defined by the user or the administrator, stored inthe library and used to create parts of features, compoundfeatures

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5. What is the difference between theSOLIDE+MODIFY+OPERATION+DUPLICATE andTRANSFORM+SYMMETRY?

The first difference between these two operations is that with theSOLIDE+modify+operation, you must first indicate whether or not this isgoing to be a duplication or replacement. The second major difference

between Transform and Modify+operation+duplicat is that Transformkeeps a link between the originating primitive where mod-op-dup doesnot. In other words, with Transform, if a change is made to theoriginating solid, the copied solids will also change.

6. What is the difference betweenSURF1+GEOEXTR and LIMIT2+SURFACE+EXTRAPOLATE?

SURF1+GEOEXTR LIMIT2+SURFACE+EXTRAPOLATE

Extrapolated surface will not behaving the same deviation anddegree of the original surface but istangent only to the one side of thesurface.(i.e, straight segment surface)

Extrapolated surface will be havingthe same shape, deviation and degreeof original surface.

Surface generated throughextrapolation is separate entity withoriginal surface and needsconcatenation of surfaces.

The resultant surface after extrapolation is single surface.(i.e automatically concatenated)

9 What is the use of Part Editor Window?Part editor allows visualization and real time modification of your

designed part by selecting or directly acting on the feature structure of the part.

10 What are contextual menu and its applications?Clicking on a branch or feature displays the corresponding contextual

menu.

This tool help you get commonly used operations faster such as:* Rename: to rename the solid* Reorder: to move the element within the structure of the solid* Color: to change the colour of the solid* Parent: to manage the parents of the element* Delete: to delete the element (=delete no keep)* Break: to separate one branch from the whole solid (=delete keep)* Active/Inactive: to activate or inactivate the element

(or only fillets or drafts of the branch)

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* Collapse/Expand: to reduce a whole branch to a single component(or vice versa) Such as a group of holes

* Smart/Unsmart: to activate or deactivate smart solidAlso in part editor, their two types of features lists can be possible.1. Simplified view of feature list:2. Detailed view of feature list: --- internal views of feature branches and

macroprimitves are displayed

9 What is Model?A Model is an individual drawing, read into main memory for

interactive processing.Models can contain one or more workspaces which inturn can contain

one or more sets with zero or more elements in each.

10 What are the functions of FORMTOOL?• Formtool allows performing semiautomatic filleting, trimming and

breaking operations on a shape with sharp edges.• Formtool creates surfaces, face and skin in a single interaction• Skins are the main tool of the Formtool function since they allow

us to combine faces and consider them as a single entity.• Formtool allows creating variable radius fillet.

11 What is the use of LAW function and where is its application?The purposes of a law are easy to understand, but its application may

be more complex. Laws involve the creation of geometry to control

differing aspects of a surface. A surface may be controlled by aspects of area, radius (width) or angle. Depending on the transitions that need tomade to another surfacic element, users may need to develop 2dimensional wireframe that will dictate how the transition is to be madein ratio proportion to the application of the law geometry. It sounds a lotharder than it is to use.

12 What is a set?A set is a disjoint group of elements of different types that can be

processed together.

13 What is an element?Elements are the lowest level geometry entity created by their

corresponding functions.

14 What is a Session?Session is a set of models.Sessions are used to allow two or more models to be positioned to

create a more complex assembly.

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A Session can contain several ‘Passive’ Models but only a single‘Active’ Model, which is the model displayed in the CATIA workspace.A Session is defined by a set of models and a SESSION MANAGER.

The SESSION MANAGER configures a CATIA session and managesthe data accessed by the user.

Working with a session is working in context; this allows you tovisualize your digital mock-up and to perform various simulations.

A session is stored in a SESSION-type file. It must be considered as atemporary work environment save.

No data transfer capability is provided on a session.15 What is Workspace? What is the difference between Master and Detail

Workspace?Each Model can have one *MASTER workspace which is the area in

which the model is created and manipulated.In addition, a model can have zero or more workspaces called

DETAIL workspaces. These are auxiliary workspaces that contain

elements that are to be duplicated to several locations in the *MASTER workspace.In addition, DETAIL workspace can also be organized into separate

library files using the LIBRARY Function. These can be shared withmany models to allow organizational standardization

17 Is it necessary to break cylindrical surface along vertically for generationof faces?

No need to brake the surface because the catia itself automaticallycreate two

faces along circumference

19 What is the difference between SPACE mode and DRAW mode?SPACE MODE:a. In Space Mode, it is possible but often quite awkward to work directly

in the3D Space. Ex: Entering points that lie in a plane can be tedious whenthree co-ordinates must be entered for each point.

b. In Space Mode, CATIA allows the user to temporarily switch into a

2D modeto create, view or manipulate elements.c. The 2D Mode is very convenient for working with 3D Geometry in

the SpaceMode of operation.

DRAW MODE:a. The Draw Mode of operation is purely 2D Mode in which CATIA can

be usedfor the drafting purposes.

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b. The geometry is 2D only but can be organized into up to 255 views.Eachview can be defined by a geometric transformation with respect toanother view. In this way, it is possible to create a multivieworthographic projection engineering drawing.

c. The Draw Mode can be used independently or it can be used to project a full3D Model into Multiple Orthographic projections for purpose of

preparing a traditional engineering drawing. This process is referred toas CATIA Draw/Space Integration and is managed by special CATIAfunctions.

d. The Draw Mode is probably the most useful way to generate paper copies of aCATIA Model for engineering purposes.

20 Write the difference between

a. DITTO,COPY and TRANSFER options in DETAIL function b. Helical Pitch and Radial Pitch in SURF1+REVOLUN+UNSPECc. PT type element and CST type elementd. ARC and SPLINEe. CURV1+COMBINE and CURV1+PROJECT

21 Whether the Curves have orientation or not?22 Whether segment lines can be made into unlimited lines?23 How many types of transformations can be achieved in CATIA?24 Describe any two types of surface modifications?25 What is the difference between the Bezier spline and Bezier Curve?

Which one will be the best to use and why?26 What is the Major differences between SURF2 surface, Net Surface and

NURBS Surface? Where and when these surfaces have applications?27 Explain the design procedure of the Free Form Design with example?28 How do you check the accuracy of the surface?29 How to access the Parent Element of the model using Contextual Menu

of the Part Editor Window?30 What are the different modeling methods available on CATIA? Which

one you choose the best method?

Infosys Questions.31 What is harness?32 Which one you would feel compatible between solid model and surface

model?33 If we give you various section contours of different size with 10mm

intervals, How you are going to generate a surface model using this data?34 What is the difference between surf1 and surf2?

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35 How do you generate surface model of stiffener or doubler using NMG?CATIA Version 5

Platform P1 and Platform P2Multiple sets of solutions for each user profiles. The two platforms,

P1 and P2, are built on the common V5 architecture, giving customers fullflexibility to grow their installations. Products from CATIA P1 are fullyoperational on a CATIA P2 platform.

P1 Platform:CATIA P1 provides core modeling for small and mid size process-

centric customers wanting to extend their design capabilities to embracedigital product definition and to position themselves for e-business. The P1Platform has a pure Windows look and feel giving unmatched ease of learning and ease of use

P1 Platform is also an excellent solution for existing customers who

can address many supporting areas of their business making CATIAcapability accessible to people that previously could not justify 3D modeling because of the hardware or training overhead.

CATIA P1 integrates growth capacity for customer methodologies,from interactive 2D drafting to full digital product development processes.All products available on Platform P1 are fully operational on a P2 Platform.

The P1 platform is available on Windows 95, 98, NT and UNIX, andincludes the following product portfolio:

a) Mechanical Design Solutions:1. CATIA Part Design 12. CATIA Assembly Design 13. CATIA Wireframe and Surface 14. CATIA Sheetmetal Design 15. CATIA Generative Drafting 16. CATIA Interactive Drafting 17. CADAM Drafting for V5

b) Analysis Solutions:1. CATIA Generative Part Structural Analysis 1

c) Product Synthesis Solutions:1. CATIA DMU Navigator 12. CATIA DMU Space Analysis 1

d) Infrastructure Solutions:

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1. CATIA Team PDM 12. CATIA IGES Interfaces3. CATIA CADAM Interface 14. CATIA STEP AP203 Interface 15. CATIA Real time Rendering 16. CATIA Object Manager 1

P2 Platform:CATIA P2 provides a unique environment for process-centric

customers to create their digital enterprise by modeling their products, processes and resources, thus supporting their end-to-end product lifecyclefrom concept to product in operation.

P2 Platform provides an extended set of solutions based on knowledgeengineering and hybrid modeling technology. It allows to drive both Formand Fit through Function specification as part of the integrated digital mock-up.

P2 Platform enables knowledge driven design that captures and reusesa company’s intellectual capital to support engineering intuition, creativityand innovation while allowing engineers to rapidly iterate error-free designalternatives.

P2 Platform provides for an innovative "3D Windows" user interfacethat delivers increased productivity and is fun to use.

The P2 platform is available on Windows NT and UNIX and includesthe following product portfolio:

a) Mechanical Design Solutions:1. CATIA Part Design 22. CATIA Assembly Design 23. CATIA Wireframe and Surface 24. CATIA Sheetmetal Design 25. CATIA Generative Drafting 26. CATIA Interactive Drafting 1

7. CADAM Drafting for V5

b) Shape Design & Styling Solutions:1. CATIA FreeStyle Shaper 22. CATIA FreeStyle Optimizer 23. CATIA Generative Shape Design 2

c) Analysis Solutions:1. CATIA Generative Part Structural Analysis 2

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2. CATIA Generative Assembly Structural Analysis 2

d) Equipment & Systems Engineering Solutions:1. CATIA System Routing 22. CATIA Circuit Board Design 2

e) Product Synthesis Solutions:1. CATIA DMU Optimizer 22. CATIA DMU Space Analysis 23. CATIA DMU Fitting Simulator 24. CATIA DMU Kinematics Simulator 25. CATIA DMU Navigator 2

f) Infrastructure Solutions:1. CATIA Knowledge Advisor 22. CATIA Knowledge Expert 2

3. CATIA Generative Knowledge 24. CATIA Team PDM 15. CATIA Version 4 Integration 26. CATIA IGES Interfaces 17. CATIA CADAM Interface 18. CATIA STEP AP203 Interface 19. CATIA Real time Rendering 110.CATIA Object Manager 2

g) Plant Solutions: 1. CATIA Plant Layout 2

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28869789 Catia Queries