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www.oto-hui.com CATIA Training Foils Sketcher Version 5 Release 8 January 2002 EDU-CAT-E-SKE-FF-V5R8 Copyright DASSA
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CATIA Training Foils
Sketcher
Version 5 Release 8 January 2002 EDU-CAT-E-SKE-FF-V5R8
Copyright DASSAULT SYSTEMES 2002
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Course Presentation Objectives of the course
In this course you will learn how to sketch, constrain, and edit 2D profiles. These profiles are then used to generate solids and surfaces
Targeted audience New users
1 day
Prerequisites Course CATIA Basics
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Table of Contents
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Introduction to CATIA Sketcher Sketching Simple Profiles Sketching Pre-Defined Profiles Editing Profiles Operations On Profiles Setting Constraints Managing Sketches
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p.4 p.13 p.52 p.58 p.68 p.102 p.126
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Introduction to the CATIA Sketcher In this lesson you will see the V5 CATIA Sketcher user interface and basic functions
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Why Using the Sketcher?
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•The Sketcher is a set of tools to help the user quickly generate 2D Geometry. •The completed Sketch can then be used to generate Solids and Surfaces •The capability to define Constraints between elements in the Sketcher allows for quick modification of the Sketch and consequently the Solids or Surfaces that are based on it. •Other tools such as Animate Constraints enable the user to explore design alternatives
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Sketcher Workbench
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Select Start > Mechanical Design > Sketcher then select a plane or a face on an object
You can also access the Sketcher by selecting the Sketcher icon from any Workbench where it is possible to do a sketch
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Sketcher Interface (1/4): Sketcher Workbench general A New Sketch will register in the Part Tree when entering the Sketcher Workbench Standard tools Exit to 3D Space
Part tree
Tools & Operations
New Sketch
Constraints Icons
Sketcher Design tools...
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Sketcher Interface (2/4): Sketcher Tools
Exit Sketcher Profile Rectangles, Keyholes, Polygons... Circles, Ellipse, Arcs...
Profiles
Spline Ellipse Line Axis Points... Corner
Operations
Chamfer Trim options... Symmetry Projection
Constraints dialog box Constraint
Constraints
Auto Constraint Animate Constraint Copyright DASSAULT SYSTEMES 2002
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Sketcher Interface (3/4):Toolbars
Icons
Predefined Profiles
Insert menu or toolbars Circles
Conic
Line
Point
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Sketcher Interface (4/4): Sketcher Plane It is possible to do zoom panning and rotation (using the mouse).
Once on the plane on which you want to sketch has been selected, it is displayed parallel to the screen (if Tools+ Option + mechanical Design + Sketcher + Position sketch plane parallel to screen is active)
To reset a sketch plane rotation, select the Normal View icon
If you select the Normal View icon when the sketch plane is already displayed parallel to the screen, you will turn the sketch plane and see its other side.
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Terminology
• The Sketch is the holding point for a group 2D elements on a specific plane. There can be more than one Sketch using the same plane as support. • The V-H Axis is the 0,0 for the Sketch. • Sketches generally consist of a Profile, Constraints, and Dimensions (a type of Constraint).
Profile
Constraints
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Dimensions
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General Process 1
2 Access the Sketcher Workbench
Select a plane, a Solid Face, or a Planar Surface to Sketch on
3 4 5
An In-Work Sketch is added to the Specifications Trees
Create Geometric Elements
Constrain the Geometric Elements
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Use the Sketch to Create a Solid or Surface 12
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Sketching Simple Profiles In this lesson you will learn how to create most of the Sketcher geometric elements. You will also learn how to use the various work modes available for the Sketcher Workbench.
The Sketcher Work Modes Profile Points Lines Spline Circles and Arcs Conics Axis Recap Exercise Copyright DASSAULT SYSTEMES 2002
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The CATIA Sketcher Work Modes
You will learn the Sketcher Work Modes by using Grid/Snap Standard/Construction Geometry Value Fields Automatic Constraints Automatic Dimensions Section View
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Why Sketcher Work Modes?
The Sketcher Work Modes aid you while you sketch the geometry. They facilitate input of values, automate Geometrical/Dimensional Constraints creation, help visualize 3D geometry etc ...
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Using Grid/Snap
When creating any lines ( profile, segment, circle, arc, curve, …), you can activate or deactivate the snap to point icon at any time. • When the snap to point icon is active, the cursor only snaps on the points of the grid (graphical creation). If you enter coordinates when the snap to point icon is active, the system does not take into account the grid and place the point in accordance with the coordinates you have entered.
• To modify the grid parameters, select Tools + Options… from the top of the screen, select Mechanical Design from the dialog box then, select the Sketcher tab. 1
3 5 4
2
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Standard/Construction Geometry Two types of elements: Standard or Construction Standard elements represent the most commonly created elements
Construction elements aim at helping you in sketching the required profile. They facilitate your design
Creating standard or construction elements is based upon the same methodology.
Clicking the icon switches from one mode to the other
Standard + Construction Elements
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Value Fields
During sketching, you can enter exact coordinates/lengths/angles in the Tools bar. 1
For the profile first point, you can define the Horizontal and Vertical coordinates. By pressing the tab key you access the Horizontal coordinate field, so you can enter it. By pressing the tab key once more, you access to the Vertical coordinate field, so you can enter it
For example, in using the Profile tool ... 2 For the profile second point, you can also use the tab key to enter a coordinate, but you can also define the second point of the profile by entering the length of the segment between the first and the second point and/or by entering the angle between the Horizontal axis and the segment to be created.
3 When profiling an arc, the tools bar allows you to enter the H and V coordinates of the last point of the arc but you can also enter a radius. You can enter these coordinates by using the tab key.
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If you enter only one of the coordinates (H, V, L, A or R) you fix it, this means that the other parameters can move graphically but not the fixed one. 18
Automatic Dimensions
1
In sketcher, select the Dimensional Constraints Icon
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When activated: - corner dimensions - chamfer dimensions - dimensions entered into the value fields are automatically created during geometry construction.
Multi-select two edges of existing rectangle
2
3
Select Corner icon
4 With Dimensional Constraints on
Move the corner preview to desired location and click
With Dimensional Constraints off
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Automatic Constraints
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In Tools/Options/Mechanical Design/Sketcher/Constraint/SmartPick specify which Constraints you want detected
With Geometrical Constraints Off
With Geometrical Constraints On
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In sketcher, select the Geometrical Constraints Icon
2
Notice that Tangency Constraints are created even when Geometrical Constraints is Off
3 Start to sketch the geometry. Variations of valid Constraints will be proposed depending on where the Mouse is with respect to the existing geometry. When you see the Constraint you require, click on the Mouse to store the Constraint (and the new geometry).
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Section View
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In order to see a Section View of the part while sketching, click on the Cutting Plane command in the Cut By Plane Toolbar. This is purely a visualization tool, no intersection curves are created from the intersection of the Solid with the Cutting Plane. If you need to Constrain to (or Dimension off from) the intersected outline of the Solid, use the Intersect 3D Elements Tool
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Profiles
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You will learn how to create a Profile element
Profile in the Sketcher
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Profile seen in 3D
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What are Profiles ?
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• A profile is a series of adjacent planar geometric elements such as points, lines, and curves • Profiles are used to extrude Sketch-Based Features Closed or open ? A profile can be: • "Closed" (the last element connects up with the first element in the series) • or "Open" (the first and last elements in the series are not in contact). • If a profile is "Closed", it can have other profiles contained inside its boundaries
Open profile Inner profiles • A profile, within a profile, is shown here to illustrate how "Inner Domains" work. Notice the reversals of the boolean operations between addition and subtraction as we progress from the outside inwards
Inner profiles Copyright DASSAULT SYSTEMES 2002
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3 Select the www.oto-hui.com
Creating Profiles
tangent arc icon, select end point
Horizontal constraint
Tangency constraint
1
In Sketcher, Select Profile icon
2
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Select the line icon (default) and click on two points to create line
Drag horizontally and click to create line. Rather than using the Tangent arc icon to create the final arc, click, drag and release at the beginning of the arc and CATIA goes into the tangent arc mode automatically.
4
Select the Three Point Arc icon and click on two points to create arc
5
Select the line icon and drag vertically to create line and click Copyright DASSAULT SYSTEMES 2002
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Points
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You will learn the various methods to create points
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How are Points Created in the Sketcher ?
Points can be created in the Sketcher in two ways: - By the user - By the system When the user creates a line, the line’s end points are automatically created by the system. When the user creates a circle, the center point is created. The coordinates of these automatically created points can later be modified by double-clicking and entering new values. Alternatively, the user can first create the points directly. He can then create a line or any other geometry by selecting these points.
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Point by Identification
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1 2 In sketcher, select the Point by Clicking Coordinates icon
Click the location where you want the point
For ease of placing the points, select the Snap to Point icon so the cursor will snap to the grid while trying to locate the point
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Points by Coordinates
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1 2 In sketcher, select the Point by clicking Coordinates icon
Fill in the desired Cartesian or Polar coordinates
If the Dimensional Constraints mode is on, Polar dimensions will automatically be created in the case of Polar input. (Cartesian dimensions created in the case of Cartesian input)
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Lines
You will learn the various methods to create lines
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What is a Line in CATIA V5?
In CATIA V5, a line segment is described in the Specifications Tree by three nodes - two point nodes (Point.1 and Point.2) and one line node (Line.1). The line is supported by its parents - the points. When the position of a point is modified (either by double-clicking and entering new coordinates; or by dragging), the position of the line will change accordingly.
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Lines Between Two Points
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1 2 In sketcher, select Line icon
Click starting point of the line...
…then click the end point
3
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OR… you can type the line specifications in the value fields of the Tools pallet
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Bi-Tangent Lines
1
2 Select the two elements you want the line to be tangent to ...
In sketcher, select the BiTangent Line icon
The Bi-Tangent line is created
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Splines
You will learn how to create a Spline in the Sketcher
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Which Should I Use - Sketcher Spline or 3D Spline? Since the 3D Spline Tool - available within the Wireframe&Surfaces (WFS) or Generative Shape Design (GSD) Workbenches - can also be used in a 2D manner (with Geometry on Support being a plane), when should you use the Sketcher Spline and when is the 3D Spline more appropriate? In general, use the Sketcher Spline to create Sketches for generating solid Sketch-Based Features. (Although Pads and Pockets can be generated from 3D Splines) Use the 3D Spline when you need more control over the Spline - i.e. Tangent Tension, Curvature Direction, Curvature Radius. Surfaces can be generated from Splines created by either method.
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Creating a Spline
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1 3
2 In sketcher, select the Spline Icon
…then click the second point of the spline
Click first point to start the spline
5 Double-Click to specify the spline End Point.
4
4 Double-Click on a Spline Control Point to specify exact coordinates or to create a Tangency vector at that point. You can later apply Constraints on this vector (i.e. make it parallel to a line). Copyright DASSAULT SYSTEMES 2002
…then click for the third point of the spline
Double-Click on a Spline Control Point to specify exact coordinates or to define a Curvature after a tangency vector 35
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Connecting curve 1 Select the
Connect icon
2
Select the first curve
3 Select the second curve
You get:
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Circles and Arcs
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You will learn the various methods to create circles and arcs.
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What are Circles and Arcs in CATIA ?
In CATIA V5, a Circle consists of two nodes: Point.1 Circle.1
specifying the coordinates of the Circle Center specifying the Radius of the Circle
The Arc will have two additional nodes: Point.2 Point.3
specifying the coordinates of one limit specifying the coordinates of the second limit
Note: When a Circle is Trimmed leaving only a portion of the complete circle. Two additional points are added to the Specifications Tree. In fact, the representation becomes the same as that of an Arc.
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Basic Circles
www.oto-hui.com 2 Click once to define the center point of the circle, then drag the cursor
1
In the sketcher, select the Circle icon
3 …and click again to define the circle size
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Circles Through Three Points
1
In sketcher, select Three Point Circle icon
Click three times to define 3 points. The circle will pass through these points
2
3
4
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Circle Using Coordinates
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1
In sketcher, select Circle using Coordinates icon
3 2 Enter the absolute coordinates of the circle
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Enter the size of the radius
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Three Points Arcs
1
2
Click first point to start the arc...
3
In sketcher, select Three Point Arc icon
…then click the second point of the arc
4 Then click the end point of the arc
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Conics
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You will learn the various methods to create conics
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Which Are the Conics that Can Be Created?
Ellipse
Parabola
Hyperbola
Conic
Required Inputs
Ellipse
Center, Major Axis Limit, Point on Curve
Parabola
Focus, Apex, Start Point, End Point
Hyperbola
Focus, Center, Apex, Start Point, End Point
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Creating an Ellipse (1/2) Click to indicate center point of ellipse
2
1
In sketcher, select Ellipse Icon
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3
…then click the second point for the major axis endpoint
The Tools Toolbar then displays values for defining the ellipse major axis endpoint
Center point coordinates can also be input in the Tools Toolbar Copyright DASSAULT SYSTEMES 2002
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Creating an Ellipse (2/2)
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4 Click to indicate for minor axis endpoint
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Creating a Parabola 2 Click to indicate the Focus Point of the Parabola
1
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3 …then click the second point for the Apex
In sketcher, select the Parabola Icon
4 Next indicate the two endpoints
As always, the Tools Toolbar is contextual and allows the user to input specific point coordinates during the creation steps
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Creating a Hyperbola 2 Click to indicate the Focus Point of the Hyperbola
4 … click the third point for the Apex
1
In sketcher, select the Hyperbola Icon
3 …then click the second point for the Center
5
Next indicate the two endpoints
As always, the Tools Toolbar is contextual and allows the user to input specific point coordinates during the creation steps
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Axis
You will learn the method to create an Axis in Sketcher
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What is the Axis Used for?
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An Axis element must be included in a Sketch from which a Shaft or Groove solid feature is created. The Profile to be swept around this axis must either be Closed or have its endpoints Coincident to the axis.
An Axis drawn into a Sketch can also be used (but not required) to generate a Surface of Revolution. A separate Line or Solid Edge can also serve to specify the axis of revolution. Also, the Profile need not be Closed nor Coincident to the axis in this case.
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Creating an Axis
1 2 In sketcher, select Axis icon
Click the first location for starting point of the axis...
…then click the end location
You will need axes whenever using a symmetry command or creating a grove or shaft.
3 Using the shaft command on our profile sketch, CATIA produces a shaft using the axis we defined
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Axes cannot be converted into construction elements
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Sketching Pre-Defined Profiles In this lesson you will learn how to Sketch the Pre-Defined Profiles
Sketching Pre-Defined Profiles Recap Exercise
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Sketching Pre-Defined Profiles
You will learn the different ways to create pre-defined profiles Rectangle Oriented Rectangle Parallelogram Elongated Hole Cylindrical Elongated Hole Keyhole Profile Hexagon Copyright DASSAULT SYSTEMES 2002
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What are Pre-Defined Profiles ?
Pre-Defined Profiles are tools to facilitate the creation of standard complex shapes with the minimal number of inputs that can fully describe all aspects of that shape. It increases productivity by reducing Mouse/Keyboard interactions
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Rectangles
1
In sketcher, select Rectangle icon
2
Click the starting corner of the rectangle...
…then click the diagonal corner
3
OR… you can type the rectangle specifications in the value fields of the Tools pallet
In creating all the Pre-Defined Profiles, it is always useful to read the prompts at the bottom left corner of the screen
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Parallelogram
3 1
In sketcher, select Parallelogram icon
2
…then click for the second corner
Click the starting corner of the Parallelogram ...
4
… finally, click to determine the width and internal angles of the Parallelogram
OR… you can type the Parallelogram specifications in the value fields of the Tools pallet Copyright DASSAULT SYSTEMES 2002
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Elongated Hole
3 2
1
… indicate the second center ...
Indicate the first center of the hole ...
4 … finally, click to determine the radius of the Elongated Hole
In sketcher, select the Elongated Hole icon
OR… you can type the hole specifications in the value fields of the Tools pallet Copyright DASSAULT SYSTEMES 2002
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Editing Profiles
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In this lesson will learn tools to help you edit Sketcher elements
Modifying Profile Geometry Recap Exercise
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Modifying Profile Geometry
You will learn how modify 2D sketch elements to propagate changes to 3D parts
Before
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After Change
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Why Modify Profile Geometry?
• Sketch-based features rely on profiles for their shape • Especially if defined with the proper constraints that represent the design intent of the part, the profile geometry can easily be changed for downstream design changes
Modified cube Design change
Corner removed from sketch
• Changing the sketch that defines a feature propagates that change to all subsequent operations involving the feature Copyright DASSAULT SYSTEMES 2002
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Modifying Profile Element Coordinates 1
Double click line to edit it’s coordinates
2
Alter the existing coordinates of the line to new parameters (V: 50mm)
H: -40 V: 50
This method works on most construction entities, opening the appropriate dialog for the entity selected Copyright DASSAULT SYSTEMES 2002
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Editing Profile Shape and Size
1
Click and drag the line downward to it’s new location
2
The profile stretches based on where you move the element and the constraints you have applied
You have modified the shape of the profile without the use of any intermediary menu options
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Deleting Sketcher Elements 1
Select sketching element to delete
2
Select Edit->Delete and the element is erased. Now multi-select additional elements to delete
3 Use the contextual menu
(select Mouse Button 3 while cursor is on one of the selected elements) to delete
Select the Undo command to restore deleted elements. The Undo command will remember all changes up to the last time the part was saved Copyright DASSAULT SYSTEMES 2002
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Editing a Spline (1/3)
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You can edit a spline modifying, adding or removing the spline control points
1
Double click on the spline to be edited
2
Select the control point to be edited
You will see:
3
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Editing a Spline (2/3)
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4
Select the control point to be edited
5
Select the Add Point After option
6
Click a point
You will see: Using the same method, you can add a point before the current point or to replace the current point by another one
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Editing a Spline (3/3)
www.oto-hui.com You can also close the spine
You can also define a tangency or/and a curvature on the current point
Do not forget to select OK in the dialog box to validate the modifications Copyright DASSAULT SYSTEMES 2002
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Auto Search
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1 Select one element in the Profile
Commands such as Auto Search that are found in the Menubar can be added as an Icon into a Toolbar if desired
2 Drag down to Auto Search from the Edit Menubar. All elements in the Profile are selected.
Auto Search is a multi-selection tool. Once selected, we can use the Contextual menu to delete or change the properties of all the elements in one go.
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Operations on Profiles
In this lesson you will learn how to reuse existing geometry
Re-limiting Operations Transformation Operations Offset Operation on 3D Geometry Recap Exercise
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Re-Limiting Operations
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You will learn how to re-limit geometry using Corner, Chamfer, Trim, and Break Operations
Before Relimitations
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After Relimitations
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Why Re-Limiting Geometry?
In general, there is much less need to re-limit geometry in V5. Each one of the closed profiles below was completely sketched with a single activation of the Profile tool. (Refer back to the Profile section for help in sketching these profiles) In fact, using the Profile tool whenever possible is the preferred practice since it will cut down on the number of user interactions. For a large number of cases, however, re-limitation of sketched geometry using Trim or Break is still necessary to achieve Design Intent.
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Corner 1 Select the
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Select the Mode - Trim All, Trim First Element, or No Trim
Corner Icon
3 Select the two lines
4
Move the mouse around so that the corner is visualized in the correct quadrant
5 Type in the radius required and hit Enter
If Dimensional Constraints is activated , the radius dimension will be created on the Sketch.
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Chamfer (1/3)
The chamfer command allows you to create a chamfer between two lines trimming either all, the first or none of the elements 1
2
Select the Chamfer icon
4
Select the first line on which the chamfer will be created
5
Select the desired chamfer trim option
3
Select the second line on which the chamfer will be created
Select the desired chamfer definition option
You get:
6
Using the TAB key, enter the chamfer parameters
6
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Press the Enter key to validate the chamfer creation 72
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Chamfer (2/3) Chamfer trim options
a
a
b
Trim all elements
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a
b
Trim first element
b
No trim
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Chamfer (3/3)
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Chamfer definition options Length/Angle option:
Length1/Length2 option
Length1/Angle option:
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Trimming lines (1/5)
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Use the trim icon to keep/erase segments before or after an intersection point between two curves or lines 1
Select the trim icon
2
Select the lines you want to trim on the sides you want kept.
According to the selected trim option (Trim All or Trim First Element), you will get :
Trim all elements
Trim the first element
Move the mouse around before selecting the second line - notice that the system shows you the various solutions possible depending on where you select this line. Copyright DASSAULT SYSTEMES 2002
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Trimming lines (2/5) - Quick Trim
Using Quick Trim when trimming lines and curves, allows you quickly remove unwanted segments 2
Select the Quick trim option
3
Select the line (a) to be trimmed You get :
Deletes
1
Select the Quick Trim icon
You get :
Keeps
You get :
Breaks
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Trimming lines (3/5) - Close Using Close allows you to close an arc into a full circle. 1
Select the Close icon
2
Select the arc to be closed
You will get :
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Trimming lines (4/5) - Close
You can close an opened ellipse using the Close icon
1
Select the Close icon from the Operation toolbar
2
Select the part of the ellipse you want to close
3
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You get:
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Trimming lines (5/5) - Close
You can also close an opened ellipse using the contextual menu of the ellipse
1
Select the Close command from the ellipse contextual menu (MB3)
2
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You get:
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Breaking
Use Break to split a line or curve into two parts.
1
Select the Break icon
2
Select the line to be broken (a) then select the breaking line (b)
You will get two lines (L1 and L2) :
(a)
(b)
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Transformation Operations
You will learn how to perform transformations such as Rotation, Translation, Scaling and Symmetry on Sketcher Geometry
7 X 45 Degrees Rotation in Duplicate Mode
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Why Transform Geometry?
Using Transformations helps the user avoid repetitive work by enabling the user to reuse existing geometry to help define new geometrically-related Sketcher elements.
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Symmetry
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2 1
Select the Symmetry Icon
Select (or Multi-Select) the element(s) to apply the Symmetry
Remember that there are a variety of MultiSelection Tools available
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3
Select a line or Axis to specify the Line of Symmetry
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Translation
1
Select (or Multi-Select) the element(s) to apply the Translation
2
Select the Translation Icon
3
Select a first point on the Grid to define the origin of the translation
4
www.oto-hui.com In general, once a value is entered, it is temporarily fixed. The remaining values continue to float. In the example below, if the length of translation is entered, the user is still capable of moving the mouse around to change the direction of the translation. Number of Copies
Options: A) Select a second point of the Grid to define the distance and direction for the translation B) Type in the coordinates of the second point into the Tools Toolbar C) Make the Translation Definition window active and type in the Length of translation. Indicate the preferred direction. (Press the TAB key to go between fields)
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Rotation
www.oto-hui.com When Snap Mode is active (as in the Rotation Definition window), the angle values that are proposed as the user moves the mouse around will take on Integer increments
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Select (or Multi-Select) the element(s) to apply the Rotation
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Select the Rotation Icon
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Select the Center Point for the Rotation
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Options: A) Select two points on the Grid with respect to the center to define the angle B) Type in the coordinates of the two points into the Tools Toolbar C) Make the Rotation Definition window active and type in the Angle of Rotation (Press the TAB key to go between fields)
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Scaling
www.oto-hui.com When Duplicate Mode is not active, the geometry selected is transformed (no new elements are created)
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Select (or Multi-Select) the element(s) to apply the Scaling
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Select the Scaling Icon
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Options: A) Select the Center Point and a second point on the Grid with respect to the center to define the magnitude of the Scaling B) Type in the coordinates of these two points into the Tools Toolbar C) Select a center point. Make the Scale Definition window active and type in the Scaling Factor (Press the TAB key to go between fields)
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Offset
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You will learn how the Offset tool is used
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What is the Offset Operation?
Offset is a local operation which allows you to duplicate one or several elements of a profile. These elements will be duplicated keeping the parallelism between the selected elements and the duplicated ones
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Offsetting Element (1/2)
The Offset command allows you to duplicate one or several elements in the sketcher. These elements will be duplicated keeping the parallelism between the selected elements and the duplicated ones
1
Once in the sketcher, select one of the element to be offset
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Select the Offset icon
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In order to select the connected element of the profile, select the Point Propagation icon
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Offsetting Element (2/2)
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The Offset command allows you to duplicate one or several elements in the sketcher. These elements will be duplicated keeping the parallelism between the selected elements and the duplicated ones In the Tools bar, enter the Offset value: 2
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You get: Press the Enter key
5
6
To validate, click on the side you want to get the offset profile
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Additional Information
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Different options to define an offset
Instead of entering an offset value, you can define a point the offset profile will pass through by entering its coordinates To offset only the selected element To define several instances
To offset only the tangent elements
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To offset only in both directions
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Operations on 3D Geometry
You will learn what tools operate on 3D Geometry from Sketch Mode and why they are important
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What are the Tools that Operate on 3D Geometry and why are they www.oto-hui.com Important?
Project
- projects elements that are off the current Sketch plane into the Sketch. - Projection is associative to the parent 3D geometry
Intersect
- intersects 3D elements with the Sketch plane - Intersection is associative to the parent 3D geometry
Isolate
- Breaks the links that Projected and Intersected elements have with their parent 3D geometry so that they may be edited independently The Profile of the Tray is linked to the Profile of the Support through a Projection
Tray Support
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Project 3D Element
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Select (or Multi-Select) the elements to project into the Sketch plane. (Selecting Solid Faces or Surfaces will project the boundary curves of these elements)
Select the Projection Icon
Here … a projected Solid Edge (a Spline contour) is used as part of the closed profile for the current Sketch
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Intersect 3D Element
1 Select (or Multi-Select) the elements to intersect with the Sketch plane.
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Select the Intersection Icon
Here … the curve generated by intersecting the surface with the Sketch plane can be used as part of the closed profile for the current Sketch 95
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Project 3D Silhouette Edges
The Project 3D Silhouette Edges command shows how to create silhouette edges to be used in sketches as geometry or reference elements. Limitations are same as Projection/Intersection command, as far as associativity is concerned. You can only create a silhouette edge from a canonical surface whose axis is parallel to the Sketch plane. 1
Select the Project 3D Silhouette Edges icon
2 Select the element to be projected
You get:
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Isolate
The Isolate command breaks the links that Projected and Intersected elements have with their parents 3D geometry so that they may be edited independently 2 Activate the Isolate command from the
Menubar - Insert/Operation/3D Geometry
1 Select (or Multi-Select) the elements to be isolated (Here … two of the edges from the projected face)
The isolated lines turn white to indicate that they are no longer linked. The user can now drag these lines to new locations or change them in any way he chooses
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Edit Mark Definition
You can see the mark characteristics and you can transform the mark in a construction element. The mark can come from a projection or an intersection
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In the sketcher, double click on the projection
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In the dialog box, select the Construction element button
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Select OK
You get: The mark is now a construction element
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Edit and Modify Import Properties You can edit Projections and Intersections
1
Double click on Projection.4
2
Select a new edge to be projected, then select OK New edge
When leaving the sketcher, you will get:
Double click
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Editing Parents Children and Constraints (1/2) You can edit an element Parents/Children and Constraints from the Parents
1
Select Parent/Children from the constraint contextual menu
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Select Show All Parents from Offset.12
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Editing Parents Children and Constraints (2/2) 3
Select Edit from Pad.1
You can, now, edit the pad
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Setting Constraints
In this lesson, you will learn how to use dimensional and geometric constraints in order to precisely define your sketch
Introduction to Constraints Quick Constraints Modification of Constraints Auto Constraint Animating Constraints Relations Between Dimensions Recap Exercise
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Introduction to Constraints
You will learn the different ways to create constraints •What are Constraints and why do we need them? •Sketching in Context
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Why Constraints?
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Without Constraints, geometry can be moved freely just by using the mouse to drag them. If Sketcher profiles are moved, so do the solids that are supported by them. In the context of an assembly, if one part moves, another part that is related to it may also move. Although in CATIA V5 geometry will remain in place when put there, without Constraints any subsequent movement of elements by the user may go unnoticed and affect Form Fit and Function of entire assemblies. Hence, Constraints serve to mathematically fix geometry in space. They also can specifically relate one element to another and serve as visual feedback to the user on what these relationships are. After Constraints are created, they are easily modified by merely changing their values or placement. From the ease at which Constraints may be modified and from the inherent downstream associativity of V5, the user can quickly explore alternative designs.
Movement of 4 Unconstrained Lines
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What are Geometric and Dimensional Constraints ?
Geometric constraints • A Geometric constraint is a specification of how two geometric elements are related to one another: are the elements coincident (located at the same place), are they concentric, tangent, perpendicular or parallel to one another?
Geometric constraint (here concentricity)
Dimensional constraints • A Dimensional Constraint, one type of Geometric Constraint, specifies the distance between two elements. This distance can be specified as a linear distance, an angular distance, or a radial distance depending on the type of geometric elements involved
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(here distance)
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What Does Sketching in Context Mean ? • Sketching in context is using existing geometry to create new geometry • When sketching with CATIA V5 space geometry is visualized. You can use it to guide your sketch
From rough to precise sketch • At first, the sketch has to only be made to conform to the spatial intent i.e. the left or right of a hole, on the inside or outside of a pocket, on the top or bottom of a pad, etc. • Later, the exact dimensions or precise geometric constraints (concentricity, parallelism, coincidence...) can be applied to the sketch (or profile) to define it precisely
3D geometry used to sketch and constrain profiles
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You can add constraints between the active sketch www.oto-hui.com
Sketching in Context
1
and any part edges, vertices or other sketches.
Activate the constraint icon
2
Select the edge of the part then the segment to be constrained
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Select the Distance constraint from the contextual menu (MB3)
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Place the constraint and modify it if necessary)
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Quick Constraints
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Dimension Constraints
Contact Constraints
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Why Quick Constraints?
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Dimension constraints and Contact constraints are frequently used. Hence, they are made accessible with just one click.
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Other constraints are chosen from a Constraint Definition Box
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Setting Dimensional Constraints
3
Select location of dimension
2
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Select sketch line to apply dimensional constraint
Select Constraint icon
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5
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Select Constraint icon
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Post selecting the circle produces a diameter dimension...
…but then selecting the line tells CATIA to reconsider the dimension and put in a distance dimension
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Setting Contact Constraints
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Select the two elements to be made in contact
Select the Contact Quick Constraints
Generally, the first element selected will remain in its current position. The second element selected will move. For more control, use the Fix Constraint beforehand. Copyright DASSAULT SYSTEMES 2002
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Modification of Constraints
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What Kind of Modifications Can be Done on Constraints?
•All geometric and dimensional constraints may be deleted using the Contextual Menu (third mouse button)
•Values of dimensions may be changed by double-clicking on them
•The type of Constraints applied on an element can be modified by reentering the Constraints Dialog Box and making modifications there
•The location of dimensions and the extension lines can be modified by dragging with the left mouse button
•A geometric or dimensional constraint attached to an element (i.e. line, circle etc …) can be reconnected to a different element. The geometry will change to conform to the new Constraint setup
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Modification in the Constraints Dialog Box 1 Select the two lines linked with the Perpendicularity constraint
2 Select Constraint Dialog Box icon
4 Select a new constraint i.e. Verticality
3 Deselect the Perpendicularity Box
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Reconnecting a Constraint
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1 Double Click on the Tangency Constraint
2 Click on More
6 Click OK to save and exit
5
Select the unassociated line in the Sketcher window
3
Select the Line component
4 Select Reconnect
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Additional Information ...
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Dimension value: To modify the position of a dimension's value:
• Click the icon • Select the value text of the dimension • Drag the value text to the new position
Dimension line: To modify the position of the dimension line:
• Click the icon • Select the dimension line • Drag the line to the new position
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Auto-Constraint
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What is Auto-Constraint?
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The AutoConstraint Tool: The AutoConstraint tool automatically detects possible constraints between selected elements and imposes these constraints once detected Elements to be constrained Fixed Elements (Independent elements from which other elements can be constrained from - normally the Sketcher Axes) Symmetry Lines (If selected will cause Symmetry Constraints to be created between elements symmetrical to these lines - the symmetry lines themselves will not be constrained)
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Auto-Constraint
1 Multi-Select the lines in this closed profile. 2
Select the Auto-Constraint Icon
3 Select the elements to be constrained
4
Select the Reference Elements Field then select the Vertical and Horizontal Axes
5 Click OK to create Constraints
Auto-Selection tools such as Auto-Search and Trap can be helpful
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Animating Constraints
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What is Animating Constraints?
The Animate Constraint Tool: The Animate Constraints tool allows you to see how a constrained system reacts when you decide to make one constraint vary. In this way, it is a tool for understanding the limitations imposed on the geometry by the current set of constraints. It can be a very useful tool for exploring design alternatives.
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Animating Constraints 1 2
Select the Animate Constraint Icon
Select the dimension you would like to vary
3 Input the initial and final values and the number of intermediate steps to display
4
Press the Play button. Cancel when done
The Animate Constraint panel works like a tape-recorder panel. The user can play forward and backwards, rewind, or play in cyclic repeat mode. Copyright DASSAULT SYSTEMES 2002
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Relations Between Dimensions
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What are Relations Between Dimensions?
Relations between Dimensions: Dependencies can be established between dimensions (For example, A=B+C/2) Originally a part of the Knowledgeware set of products, this functionality has been incorporated into the V5 infrastructure and is generally accessible from all Workbenches. In CATIA V5, in addition to relationships between dimension values, dimensions can be made dependent on other parameters such as Forces, Temperature, Time, or Material Properties etc ...
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Creating a Relation Between Dimensions 1 2
Select the dimension you would like to be made dependent
Use the Contextual Menu (third mouse button) and drag down to Edit Formula
3 1) Select the 40 dimension 2) Type in “+” 3) Select the 10 dimension 4) Type in “/2”
When required, open “(“ and Close “)“ parentheses can be used to indicate the order of evaluation for the expression
4 Select OK to create the relation
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Managing Sketches
In this lesson, you will learn ways to manage Sketches within a 3D environment
Creating Planes Replacing a Sketch Changing Sketch Support Sketch Analysis Change Body Recap Exercise
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Creating Planes
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You will learn how to create Planes in space for use as sketching planes
Planes
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Why Creating Planes ?
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• Sometimes we will need to create Planes to use as Sketching Planes Offset planes • Offset Planes sometimes will need to be created to help define the extrusion extents of a Sketch-Based Feature
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Angled planes • Angled Planes are used to define Sketch-Based Features that are angled with respect to the other features
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Creating an Angled Plane
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1
Select Plane Icon (Available from the WireFrame&Surfaces (WFS) or the Generative Shape Design (GSD) Workbenches
4
The resulting plane (Plane.3) is 45deg to the face, rotated about the selected edge
2
For “Angle to Plane” creation type, select edge as reference to rotate resulting plane about
3
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Select the upper face as the reference plane to rotate from. A preview plane that can be dragged to a new location is shown
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Creating an Offset Plane
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2
1
Select Face
Select Plane Icon (Available from the WireFrame&Surfaces (WFS) or the Generative Shape Design (GSD) Workbenches
3
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The offset distance from the reference face can be set by typing the value in the dialog or dragging the circular “handle” on the graphic screen
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Different planes: • The plane definition dialog box provides various methods for creating a plane:
Different planes
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Replacing a Sketch
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You will learn how to replace a Sketch being used to support a Solid or Surface element with a different Sketch
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Why Replace a Sketch ?
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Replacing a Sketch is quick way to modify solids or surfaces using that Sketch for their definition. The user creates a new Sketch with the new profile that he requires. He then merely replaces the old Sketch with the new one. The solids or surfaces that depended on the previous Sketch do not have to be re-created since they will be modified automatically and pointed to the new Sketch.
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Replacing a Sketch
3 2
1 Check what plane the original sketch lies on. You can use the Parent/Children analysis from the Contextual Menu (third mouse button on the Sketch) if you like
Create the new sketch on the same plane (Note: although this is normally the case - it is not a requirement)
Right click on the the original sketch and drag down to “Replace”. Click on your new sketch as the replacing sketch
4
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Changing Sketch Support
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What is Changing a Sketch’s Support?
Changing a Sketch’s Support: By changing its supporting plane, a Sketch can be moved to a new plane without having to recreate the Sketch Copies of a Sketch can be moved onto different planes in this way
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Changing Sketch Support 1
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While outside the Sketcher mode, use the Contextual Menu on the Sketch to be modified and drag down to Change Sketch Support
Naturally, any Solid or Surface elements attached to the Sketch will also be moved accordingly
2 Select the new plane for the Sketch
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Sketch Analysis
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You will learn how to analyze sketched geometry, projection and intersection. You will be provided either a global or individual status and will be allowed to correct any problem
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What is Analyzing a Sketch (Geometry)? Most of the time, we draw a sketch in order to use it to build a sketch based feature (e.g.: a pad). Sometimes, when we try to use the sketch, CATIA refuses to build the feature because the sketch is not closed (or overlapping) and it is sometimes quiet difficult to see where the sketch is opened (or overlapping). The Tools + Sketch Analysis command allows us to check if a sketch can be used to create a sketch based feature
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What is Analyzing a Sketch (Geometry)? During the sketch analysis, it is possible to do Corrective Actions:
• Set in Construction Mode • Close Opened Profile • Delete Geometry
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What is Analyzing a Sketch (Projection/Intersection)? The Sketch Analysis command can be used to check projection or intersection with 3d elements
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What is Analyzing a Sketch (Projection/Intersection)? During the sketch analysis, it is possible to do Corrective Actions:
• Isolate Geometry • Activate / Deactivate • Delete Geometry • Replace 3D Geometry
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Analyzing a Sketch: Geometry (1/2) The Tools + Sketch Analysis command allows us to check if a sketch can be used to create a sketch based feature
1
In order to edit the sketcher, double click on Sketch.1 in the tree
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Select the Tools+ Sketch Analysis command
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Analyzing a Sketch: Geometry (2/2) The Tools + Sketch Analysis command allows us to check if a sketch can be used to create a sketch based feature 3
If necessary, select the Geometry tab in the dialog box
4
In order to better see the sketch, select the Hide constraints button, the constraints will be hidden
You can now see where the sketch is opened and you can correct it
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Analyzing a Sketch: Projection/Intersection (1/2) The Tools + Sketch Analysis command allows us to check if a sketch can be used to create a sketch based feature 1
In order to edit the sketcher, double click on Sketch.3 in the tree 2
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Select the Tools+ Sketch Analysis command
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Analyzing a Sketch: Projection/Intersection (2/2) The Tools + Sketch Analysis command allows us to check if a sketch can be used to create a sketch based feature 3
If necessary, select the Projection/Intersection tab in the dialog box
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You can now check if the intersections and projections contained in the sketcher are valid or not
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Additional Information
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Different Corrective Actions that can be done when analyzing a sketch:
Analyzing a Sketch: Geometry Set in Construction Mode
Close Opened Profile
Delete Geometry
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Additional Information
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Different Corrective Actions that can be done when analyzing a sketch:
Analyzing a Sketch: Projection/Intersection Isolate Geometry: When using this icon, the selected projected or intersecting element is separated from its 3d components
Activate/Deactivate: When using this icon, the selected element (of the sketch) is no more taken into account when creating a sketch based feature, but the element still exists
Delete Geometry: When using this icon, the selected element is remove from the sketch
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Change Body
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You will learn how to move one sketch from a body to another one
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Why Moving one Sketch from a Body to Another one ? When working with several bodies, you may want to create a sketch base feature (a pad for example) and the necessary sketch has been created in a body different from the active one. In this case you may want to transfer the sketch from its body of creation into the active one (it is not mandatory but it is helpful to understand the part structure
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Change Body
You can move one sketch from a body to another one
1
Select the Change body command from the sketch contextual menu
2
Select the body in which you want to move the sketch, then select OK
You get:
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