2 catia sketcher

7/28/2019 2 Catia Sketcher

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Sketcher

CATIA TrainingFoils


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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

Prerequisites

CATIA Basics

1 day


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Table of Contents (1/2)

1. Course Presentation p. 2

2. Introduction to the CATIA Sketcher p. 5

3. Sketching Simple Profiles p. 16

1. The CATIA Sketcher Work Modes p. 17

2. Profiles p. 25

3. Points p. 28

4. Lines p. 32

5. Splines p. 36

6. Circles and Arcs p. 41

7. Conics p. 47

8. Axis p. 53

4. Sketching Pre-Defined Profiles p. 57

1. Sketching Pre-Defined Profiles p. 58

5. Editing Profiles p. 64

1. Modifying Profile Geometry p. 65


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Table of Contents (2/2)

6. Operations on Profiles p. 75

1. Re-Limiting Operations p. 76

2. Transformation Operations p. 88

3. Offset p. 94

4. Operations on 3D Geometry p. 100

7. Setting Constraints p. 112

1. Introduction to Constraints p. 113

2. Quick Constraints p. 118

3. Modification of Constraints p. 122

4. Auto-Constraint p. 1275. Animating Constraints p. 130

6. Sorting Sketches by their Solving Status p. 133

7. Performing a Quick Geometry Diagnosis p. 138

8. Relations Between Dimensions p. 141

8. Managing Sketches p. 145

1. Creating Planes p. 146

2. Replacing a Sketch p. 151

3. Changing a Sketch Support p. 154

4. Sketch Analysis p. 157

5. Change Body p. 168


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Introduction to the CATIA Sketcher

In this less on you wil l see the V5 CATIA Sketcher user interface and basic

funct ions

Why Using the Sketcher ?

Sketcher Workbench

Sketcher Interface

Sketcher Terminology

Sketcher General Process

To Sum Up


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Why Using the Sketcher?

The Sketcher is a set of tools to help users 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 forquick 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 (1/2)

Select Start > Mechanic al

Design > Sketcher then selecta plane or a face on an o bject


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Sketcher Workbench (2/2)

If you want to create a Sketch by specifying its 3D position and orientation, you have to

select the Sketch Positionning icon.

You can also access the Sketcher by selecting the Sketcher icon from any Workbench

where it is possible to do a sketch.

A dialog box where you can define the Absolute Axis System

appears. If you create a Sketch, it will be positionned

regarding to this System.


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Sketcher Interface (1/4): Sketcher Workbench General

Sketcher

Design tools...

Exit to3D Space

Part tree

Standard tools

New Sketch

A New Sketch w il l register in the Part Tree when enter ing the Sketcher Work bench

Constraints

Icons

Tools & Operations


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Sketcher Interface (2/4): Sketcher Tools Exit Sketcher

Profile

Rectangles, Polygons...

Circles, Ellipse, Arcs...

Spline

Ellipse

Line

Axis

Points...

Corner

Chamfer

Trim options...

Symmetry

Projection

Constraints dialog box

Constraint

Auto Constraint

Animate Constraint

Profiles

Operations

Constraints


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Sketcher Interface (3/4): Toolbars

Insert menu or toolbars

Sketcher

Icons

Predefined Profiles

Circles

Conic

Line

Point


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Sketcher Interface (4/4): Sketcher Plane

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)

It is possible to zoom, pan and

rotate (using the mouse).To reset a

sketch plane

orientation,

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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Sketcher 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

Dimensions


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General Process

Access the

Sketcher

workbench

Creategeometric

elements

Use the sketch

to create a solid

or surface

Constrain the

geometric

elements

Select a plane,

a solid face, or a planar

surface to sketch on

An in-work sketch

is added to the

Specification tree

1

2

3

4

5

6


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Sketching Simple Profiles

In this lesson yo u w i l l learn how to create most of the Sketcher geometric

elements . You w il l also learn how to u se the various work m odes avai lable forthe Sketcher Workbenc h

The CATIA Sketcher Work Modes

Profiles

PointsLines

Splines

Circles and Arcs

Conics

Axis

To Sum Up


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The CATIA Sketcher Work Modes

You wi l l learn the Sketcher work m odes by us ing:

Grid/SnapStandard/Construction Geometry

Automatic ConstraintsAutomatic DimensionsSection View

Value Fields


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Why Sketcher Work Modes?

The Sketcher work modes aid you

while you sk etch the geometry.

They faci l i tate input of values,

automate Geometr ical/DimensionalConstraints creation, help visu al ize

3D geometry etc ...


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Using Grid/Snap

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.

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.

1

2

3

4

5

St d d / C t ti G t


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Standard / Construction Geometry

Two typ es of element: Standard or Constru ction

Standard elements represent the most commonlycreated elements

Constru ction elements aim at helping you in

sketchin g the required profi le. They faci l i tate your

design

Creating standard or con struc tion elements is based

upon the same methodology.

Cl ick ing the icon switches from one mode to the other

Standard + Construction

Elements

V l Fi ld


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Value Fields

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

When sketching, you can enter exact

coordinates/lengths/angles in the Tools bar.

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.

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.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.

1

2

3

For example, in using the

Profile tool ...

A t ti Di i


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Automatic Dimensions

When activated:

- corner dimensions

- chamfer dimensions

- dimensions entered into

the value fields

are automatically created

during geometry

construction.

In sketcher,

select the

Dimensional

Constraints

Icon

Multi-select

two edges of

existing

rectangle

2

Select the

Corner icon

Move the

corner

preview to

the desired

location andclick

4

With Dimensional

Constraints on

With Dimensional

Constraints off

1

3


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Section Views


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Section Views

In order to see a Section View of the part

while sketching, click on the Cutting Plane

icon 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

Profiles


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Profiles

You w i l l learn h ow to c reate a Prof i le element

Profile in the Sketcher Profile seen in 3D

What are Profiles ?


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What are Profiles ?

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

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

Open profile

Closed or open ?

A profile is a series of adjacent planar geometric elements such as points, lines, and curves

Profiles are used to extrude Sketch-Based features

Inner profiles

Inner profiles

Creating ProfilesSelect the

tangent arc


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Creating Profiles

In the Sketcher,

Select Profile icon

Select the line icon

(default) and click on two

points to create line

2

tangent arc

icon, select

end point

3

Horizontal

constraint

Tangency

constraint

Select the line icon and

drag vertically to create

line and click

5

Select the Three PointArc icon and click on

two points to create arc

4Drag 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.

6

1


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Two Ways to Create Points in the Sketcher


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Two Ways to Create Points 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 lines 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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What is a Line in CATIA V5?


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In CATIA V5, a line segment is described in the

Specification 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.

Lines Between Two Points


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In the Sketcher, selectthe Line icon

Click on

starting point

of the line...then click on

the end point

OR you can type the line

specifications in the value fields

of the Tools toolbar

3

2

1

Bi-Tangent Lines


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In the Sketcher, select the

Bi-Tangent Line icon

1

Select the two elementsyou want the line to be

tangent to ...

2

The Bi-Tangent

line is created


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Which Should I Use - Sketcher Spline or 3D Spline?


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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. TangentTension, Curvature Direction, Curvature

Radius.

Surfaces can be generated from Splines

created by either method.


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Circles and Arcs


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You wi l l learn the var ious methods to c reate circles and arcs.


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Basic Circles


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Click once to define the center point of

the circle, then drag the cursor2

and click

again to define

the circle size

In the sketcher, select the

Circle icon

1

3


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Types of Conic that Can Be Created


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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

Ellipse Parabola Hyperbola

Creating an Ellipse (1/2)

Cli k t i di t t


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Click to indicate center

point of ellipse

2

The Tools Toolbar then displays

values for defining the ellipse

major axis endpoint

then click the

second point for

the major axis

endpoint

In the Sketcher, select

the Ellipse Icon

3

Center point

coordinates can

also be input in

the Tools Toolbar

1


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Creating a Parabola

Click to indicate the


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Focus Point of the

Parabola

2

Next indicate the two endpoints

then click the

second point for

the Apex

In the Sketcher,

select the

Parabola Icon

3

As always, the Tools

Toolbar is contextual and

allows the user to input

specific point coordinates

during the creation steps

4

1

Creating a Hyperbola

Click to indicate the2


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Focus Point of the

Hyperbola

2

Next indicate the two endpointsthen click the

second point for

the Center

In the Sketcher,

select the

Hyperbola Icon

3

As always, the Tools

Toolbar is contextual and

allows the user to input

specific point coordinates

during the creation steps

5

click the third

point for the Apex

4

1


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Elongated Hole


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OR you can type the hole

specifications in the value fields

of the Tools pallet

3

In the Sketcher, select

the Elongated Hole icon

1Indicate the first

center of thehole ...

2

indicate the

second center ...

finally, click to

determine the radius of

the Elongated Hole

4

To Sum Up ...

You have learned to create Pre-Defined Profiles such as:


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Rectangle

Oriented Rectangle

Parallelogram

Elongated Hole

Cylindrical Elongated Hole

Keyhole Profile

Hexagon


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Deleting Sketcher Elements

Select the element to delete1


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Select the Undo icon or option to restore deleted elements.

The Undo icon or option will remember all changes up to the

last time the part was saved

Select Edit->Delete and the element

is suppressed. Now multi-select

additional elements to delete

2

Use the contextual menu

(select Mouse Button 3

while cursor is on one of

the selected elements) todelete

3

Editing a Spline (1/3)

Double click on the spline to be edited1You can edit a spline modifying, adding or

removing the spline control points


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Select the control point to be edited2

You will see:

3


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Auto Search

Commands such as Auto Search that


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Auto Search is a multi-selection tool.

Once selected, you can use the

Contextual menu to delete or change the

properties of all the elements in one go.

Commands such as Auto Search that

are found in the Menu bar can be added

as an Icon into a Toolbar if desired

Drag down to Auto Search from

the Edit Menu bar. All elements in

the Profile are selected.

2

Select one

element in the

Profile

1


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Operations on Profiles


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In this lesson you wi l l learn how to reuse exist ing geometry

Re-Limiting Operations

Transformation Operations

Offset

Operations on 3D Geometry

To Sum Up


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Trimming Lines (1/5)

Use the tr im ic on to keep/erase segments before or after an intersection

point between two curv es or lines


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Select the Trim icon1 Select the lines you want

to trim on the sides you

want kept.

2According 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.

Trimming Lines (2/5) - Quick Trim

Select the line (a) to be trimmed

2 Select the Quick trim option

3

Using Quick Tr im when tr imming l ines and cu rves, al lows

you quick ly remove unwanted segments

You get :


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Deletes

Keeps

Select the Quick Trim icon1

Q p

Breaks

You get :

You get :


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BreakingUse Break to sp l i t a line or curve into tw o parts.


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Select the Break icon1

Select the line to be broken (a) then

select the breaking line (b)

2You will get two lines (L1

and L2) :

(a)

(b)


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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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Offset

You wi l l learn how th e Offset tool is us ed


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Additional Information (2/2)You can create autom atical ly constraints wh en offsett ing 2D geometries.

1 Create a circle.


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2

3 This option is also available whenoffsetting lines and arcs.

Select the Offset icon . If the Geometrical

constraints icon is active , constraints areautomatically created when offsetting the circle. Thus,

if you move this circle, or change its geometry, the

other element will be modified or moved accordingly.


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Edit and Modify Import Properties (1/2)You can edit Projections and Intersections

Double click on Projection.41

New edge

Select a new edge to be

projected, then select OK2


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Double click

When leaving the

sketcher, you will get:


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To Sum Up ...

You have learned how to perform various operations on the geometry you create in the

Sketcher (and to bring 3D geometry into the context of the Sketcher):

Re-limiting Operations (Corners, Chamfers )


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Global Transformations (Translations, Rotations )

Offset

Operations on 3D Geometry (Project, Intersect )

Setting Constraints

Introduction to Constraints


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Quick ConstraintsModification of Constraints

Auto Constraints

Animating Constraints

Sorting Sketches by their Solving StatusPerforming a quick geometry Diagnosis

Relations Between Dimensions

To Sum Up


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Why Constraints?

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


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subsequent movement of elements by the user may go unnoticed and affect Form Fit andFunction 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 orplacement. 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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Reconnecting a Constraint

Click on More

2

Double Click on the

Tangency Constraint

1

Click OK to save and exit6


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3Select the Line

component

3

Select Reconnect

Select the unassociated line in

the Sketcher window

4

4

5


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Relations Between Dimensions


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Sketch Analysis

You wi l l learn how to analyze sketch es: geometry, project ion and intersect ion. You wi l l get

either a glob al or an indiv idu al status, and yo u wil l be able to correct any pro blem


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Change Body

You wi l l learn how to m ove one sketch from a bod y to another one


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To Sum Up ...

You have learned how to manage 2D sketches in 3D space by:

Creating Planes in 3D

and using tools such as:

Replacing a Sketch

Changing a Sketch Support


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Changing a Sketch Support

Sketch Analysis

2 catia sketcher

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