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Chapter 2: SKETCHER: Tutorial 2.1CopyrightedMaterial12) Edit Sketch.3 (the sketch associated with the pocket). In the specificationtree, double click on Sketch.3, or right click on it and select Sketch.3 object Edit. You will automatically enter the sketcher on the sketch plane used tocreate this sketch.13) Activate the Dimensional Constrainticon. It should be orange.icon, select14) Select the Cornerthe bottom left corner point of the leftrectangle, move your mouse up andto the right, and click. A corner orfillet will be created. The corner iconis located in the Operations toolbarnear the bottom of the right sidetoolbar area. The corner/filletmay also be created by Corner pointselecting the two lines thatcreate the corner. Notice that adimension is automatically created.CopyrightedMaterial15) Deactivate the DimensionalConstrainticon. It should beCopyrightedMaterialblue. Create a Cornerin theupper right corner of the samerectangle. Notice that this time nodimensional constraint was created.16) Exit the Sketcher. We havechanged the sketch used to createthe pocket. Notice that the pocket is automatically updated to reflect thesechanges.CopyrightedMaterialSection 4: Cutting the part by the sketch plane.Sometimes it is necessary to sketch inside the part. The Cut Part by SketchPlane command allows you to see inside the part and makes it easier to drawand constrain your sketch.1) Enter the Sketcheron the xy plane.2.1 - 11

Chapter 2: SKETCHER: Tutorial 2.1CopyrightedMaterial2) Select the Isometric Viewarea.icon. This icon is located in the bottom toolbar3) Select the Cut Part by SketchPlaneicon located in thebottom toolbar area. The part innow cut by the xy plane (thesketch plane).CopyrightedMaterial4) Select the Top viewiconand draw a Circlein themiddle of the hole as shownin the figure.5) Exit the Sketcher.6) Select the Padicon andthen select the More button.Fill in the following fields for boththe First and Second Limits;Type: Up to surface, Limit:Select the inner circumference ofthehole,andSelection:Sketch.4 (the circle). SelectPreview to see if the Pad will beapplied correctly, and then OK.CopyrightedMaterialCopyrightedMaterial2.1 - 12

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedChapter 2:SKETCHERMaterialTutorial 2.2: Simple Profiles &ConstraintsCopyrightedMaterialFeatured Topics & CommandsProfile toolbarConstraints toolbarSelecting iconsPart ModeledSection 1: Creating circles.Section 2: Creating dimensional constraints.Section 3: Creating lines.Section 4: Creating geometrical constraints.Section 5: Creating arcs.CopyrightedMaterialPrerequisite Knowledge & Commands Entering workbenchesEntering and exiting the Sketcher workbenchSimple PadsWork modes (Sketch tools toolbar)CopyrightedMaterial2.2 - 12.2-22.2-52.2-52.2-62.2-62.2-72.2-82.2-112.2-14

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterialProfile toolbarThe Profile toolbar contains 2D geometry commands. These geometries rangefrom the very simple (point, rectangle, etc.) to the very complex (splines, conics,etc.). The Profile toolbar contains many sub-toolbars. Most of these subtoolbars contain different options for creating the same geometry. For example,you can create a simple line, a line defined by two tangent points, or a line that isperpendicular to a surface. Reading from left to right, the Profile toolbar containthe following file toolbar Profile: This command allows you to create a continuous set of lines and arcsconnected together.Rectangle / Predefined Profile toolbar: The default top command is rectangle.Stacked underneath are several different commands used to createpredefined geometries.Circle / Circle toolbar: The default top command is circle. Stacked underneathare several different options for creating circles and arcs.Spline / Spline toolbar: The default top command is spline which is a curvedline created by connecting a series of points.Ellipse / Conic toolbar: The default top command is ellipse. Stackedunderneath are commands to create different conic shapes such as ahyperbola.Line / Line toolbar: The default top command is line. Stacked underneath areseveral different options for creating lines.Axis: An axis is used in conjunction with commands like mirror and shaft(revolve). It defines symmetry. It is a construction element so it does notbecome a physical part of your feature.CopyrightedMaterial2.2 - 2

Chapter 2: SKETCHER: Tutorial 2.2 CopyrightedMaterialPoint / Point toolbar: The default top command is point. Stacked underneathare several different options for creating points.Predefined Profile toolbarPredefined profiles are frequently used geometries. CATIA makes these profilesavailable for easy creation which speeds up drawing time. Reading from left toright, the Predefined Profile toolbar contains the following commands. Rectangle: The rectangle is definedby two corner points. The sides of therectangle are always horizontal andvertical.Oriented Rectangle: The oriented rectangle is defined by three corner points.This allows you to create a rectangle whose sides are at an angle to thehorizontal.Parallelogram: The parallelogram is defined by three corner points.Elongated Hole: The elongated hole or slot is defined by two points and aradius.Cylindrical Elongated Hole: The cylindrical elongated hole is defined by acylindrical radius, two point and a hole radius.Keyhole Profile: The keyhole profile is defined by two center points and tworadii.Hexagon: The hexagon is defined by a center point and the radius of aninscribed circle.Centered Rectangle: The centered rectangle is defined by a center point anda corner point.Centered Parallelogram: The centered parallelogram is defined by a centerpoint (defined by two intersecting lines) and a corner point.CopyrightedMaterialCopyrightedMaterialCircle toolbarThe Circle toolbar contains several different ways of creating circles and arcs.Reading from left to right, the Circle toolbar contains the following commands. Circle: A circle is defined by a center pointand a radius.Three Point Circle: The three point circlecommand allows you to create a circle usingthree circumferential points.Circle Using Coordinates: The circle using coordinates command allows youto create a circle by entering the coordinates for the center point and radius ina Circle Definition window.Tri-Tangent Circle: The tri-tangent circle command allows you to create acircle whose circumference is tangent to three chosen lines.CopyrightedMaterial2.2 - 3

Chapter 2: SKETCHER: Tutorial 2.2 CopyrightedMaterialThree Point Arc: The three point arc command allows you to create an arcdefined by three circumferential points.Three Point Arc Starting With Limits: The three point arc starting with limitsallows you to create an arc using a start, end, and midpoint.Arc: The arc command allows you to create an arc defined by a center point,and a circumferential start and end point.Spline toolbarReading from left to right, the Spline toolbar contains the following commands. Spline: A spline is a curved profile defined by three or morepoints. The tangency and curvature radius at each point may bespecified.Connect: The connect command connects two points or profileswith a spline.CopyrightedMaterialConic toolbarReading from left to right, the Conic toolbar contains the following commands. Ellipse: The ellipse is defined by center point and amajor and minor axis points.Parabola by Focus: The parabola is defined by a focus,apex and a start and end point.Hyperbola by Focus: The hyperbola is defined by a focus, center point, apexand a start and end point.Conic: There are several different methods that can be used to create coniccurves. These methods give you a lot of flexibility when creating above threetypes of curves.Line toolbarCopyrightedMaterialThe Line toolbar contains several different ways of creating lines. Reading fromleft to right, the Line toolbar contains the following commands. Line: A line is defined by two points.Infinite Line: Creates infinite lines that are horizontal,vertical or defined by two points.Bi-Tangent Line: Creates a line whose endpoints aretangent to two other elements.Bisecting Line: Creates an infinite line that bisects the angle created by twoother lines.Line Normal to Curve: This command allows you to create a line that startsanywhere and ends normal or perpendicular to another element.CopyrightedMaterial2.2 - 4

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterialPoint toolbarThe Point toolbar contains several different ways of creating points. Readingfrom left to right, the Point toolbar contains the following commands. Point by Clicking: Creates a point by clicking the leftmouse button.Point by using Coordinates: Creates a point at aspecified coordinate point.Equidistant Points: Creates equidistant points along a predefined path curve.Intersection Point: Creates a point at the intersection of two differentelements.Projection Point: Projects a point of one element onto another.CopyrightedMaterialConstraint toolbarConstraints can either be dimensional or geometrical. Dimensional constraintsare used to constrain the length of an element, theradius or diameter of an arc or circle, and thedistance or angle between elements. Geometricalconstraints are used to constrain the orientation ofone element relative to another. For example, twoelements may be constrained to be perpendicular toeach other. Other common geometrical constraintsinclude parallel, tangent, coincident, concentric,etc. Reading from left to right: CopyrightedMaterialConstraints Defined in Dialoged Box: Creates geometrical and dimensionalconstraints between two elements.Constraint: Creates dimensional constraints.Contact Constraint: Creates a contact constraint between two elements.Fix Together: The fix together command groups individual entities together.Auto Constraint: Automatically creates dimensional constraints.Animate Constraint: Animates a dimensional constraint between to limits.Edit Multi-Constraint: This command allows you to edit all your sketchconstraints in a single window.CopyrightedMaterialSelecting iconsWhen an icon is selected, it turns orange indicating that it is active. If the icon isactivated with a single mouse click, the icon will turn back to blue (deactivated)when the operation is complete. If the icon is activated with a double mouse click,it will remain active until another command is chosen or if the Esc key is hit twice.2.2 - 5

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterialPart ModeledThe part modeled in this tutorial is shownon the right. This part will be created usingsimple profiles, circles, arcs, lines, andhexagons.Thegeometriesareconstrained to conform to certaindimensional (lengths) and geometricalconstraints (tangent, perpendicular, etc.).Section 1: Creating circles.(Hint: If you get confused about how toapply the different commands that areused in this tutorial, read the prompt linefor additional help.)CopyrightedMaterial1) Launch CATIA V5, enter the PartDesign workbench and, if asked,name your part Post.2) Enter the Sketcherplane.on the zx3) Set your grid spacing to be 100 mmwith 10 graduations, activate the Snapto point, and activate the geometrical and dimensional constraints. (Tools –Options.)CopyrightedMaterialDuplicate thesettings shown.CopyrightedMaterial2.2 - 6

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial4) Pull out the Circle toolbar5) Double click on the Circledraw the circles shown.icon and6) Exit the Sketcherand Padthe sketch to12 mm on eachside (Mirroredextent). Noticethat the innercircle at thebottom becomesa hole.CopyrightedMaterialSection 2: Creating dimensional constraints.CopyrightedMaterial1) Expand your specification tree to the sketchlevel.2) Edit Sketch.1. To edit a sketch you can doubleclick on the sketch name in the specification tree,or you can right click on the name selectSketch.1 - Edit. CATIA automatically takes youinto the sketcher on the plane used to createSketch.1.3) Double click on the Constraintsicon.CopyrightedMaterial4) Select the border of the upper circle, pull thedimension out and click your left mouse button toplace the dimension. Repeat for the two bottomcircles.5) Select the center point of the upper circle, thenthe center point of the lower circles, pull the dimension out and click.2.2 - 7

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial6) Double click on the D20 dimension. In theConstraint Definition window, change thediameter from 20 to 16 mm.D481407) In a similar fashion, change the otherdimensions to the values shown in the figure.CopyrightedMaterialD16D328) Exit the Sketcherand deselect all.Notice that the part automatically updates tothe new sketch dimensions.Section 3: Creating lines.1) Enter the Sketcheron the zx plane.13CopyrightedMaterial2) Deactivate the Snap to Pointicon.3) Project the two outer circles of the part onto thesketch plane. Double click on the Project 3DElementsicon. This icon is located in thelower half of the right side toolbar area. Selectthe outer edges of the two cylinders.4) Pull out the line toolbar.CopyrightedMaterial5) Double click on the Bi-Tangent Lineicon.Select the points, in order, as indicated on thefigure.2.2 - 824

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial6) Pull out the Relimitations toolbarOperation toolbar.located in theProjected edgeTrimmed edge7) Double click on the Quick trimicon. Select the outer portion of theprojected circles. Notice that thetrimmed projection turns into aconstruction element (dashed).13CopyrightedMaterial8) Exit the Sketcherand Padthe sketch to 6 mmoneachside(Mirrored extent).Projected edgeCopyrightedMaterial2Trimmed edgeCopyrightedMaterial2.2 - 94

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial9) Enter the Sketcheron the zx plane.icon (it should be10) Activate the Construction/Standard Elementorange).11) Select the Project 3D Elementsicon and thenproject the left line of the part as shown in thefigure.CopyrightedMaterial12) Activate your Snap to Pointicon.13) Draw a line that starts at point 1(seefig.)andendsnormal/perpendicular to projectedline using the Line Normal toCurveProjected lineicon.Normal line114) Deactivate your Snap to Pointicon.CopyrightedMaterialBisecting line15) Draw a Linepoint 2.from point 1 to16) Draw a line that bisects theprevious 2 lines using theBisecting Lineicon. Readthe prompt line for directions.217) Deselect all.CopyrightedMaterial18) Deactivate the Construction/Standard Elementnow).2.2 - 10icon (it should be blue

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial19) Draw a circle that is tangent to the projectedline, normal line and bisecting line using theTri-Tangent Circleprompt line for directions.icon. Read theCopyrightedMaterial20) Zoom in on the circle.21) Using Profile, draw the three additionallines shown in the figure.CopyrightedMaterial22) Use the Quick Trimcommand to trim off theinside portion of the circle as shown. You willhave to apply the quick trim operation twice.23) Draw a Hexagonthat has the same center asthe circle/arc and is the approximate size shown inthe figure. The Hexagon icon is usually stackedunder the Rectangleicon. (Your hexagon willcontain many constraints that are not shown in thefigure.)CopyrightedMaterial24) Deselect all.2.2 - 11

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial25) Apply a dimensional Constrainttothe distance between the flats of thehexagon as shown. To create thisconstraint, select the top line and thenthe bottom line. Double click on thedimension and change its value to 7 mm.26) Exit the SketcherandCopyrightedMaterialPadthe sketch to a lengthof 2 mm on each side(Mirrored extent).CopyrightedMaterialSection 4: Creatingconstraints.geometrical1) Enter the Sketcheron the flatface of the large cylinder.Sketch faceCopyrightedMaterial2.2 - 127

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial2) Deactivate the Geometrical Constrainticon (it should be blue). This willallow you to create profiles with no automatically applied constraints.3) On the face ofthe largecylinder, drawthe Profileshown. Nogeometricalconstraintsshould beindicated.Horizontal constraintVertical constraintParallel constraintCopyrightedMaterial4) Deselect all.Perpendicularconstraint5) ReactivatetheGeometricalConstraintsicon (it should be orange).6) Apply a vertical constraint to the right line of the profile by right clicking on itand selecting Line.? object – Vertical.7) Apply a horizontal constraint to the top line using a similar procedure.CopyrightedMaterial8) Deselect all.9) Apply a perpendicular constraint between the rightand bottom line of the profile. Hold the CTRL keydown and select the left and bottom lines. Select theConstraints Defined in Dialog Boxicon. Inthe Constraint Definition window, check the boxnext to Perpendicular and then select OK.10) Apply a parallel constraint between the left and rightlines of the profile in a similar way.CopyrightedMaterial2.2 - 13

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial11) Apply Constraintsto therectangle and change their values tothe values shown in the figure.2014CopyrightedMaterial12) Apply the additional dimensionalconstraints shown in order toposition the rectangle. Select theConstraintsicon, then thecircumference of the circle and thenthe appropriate side of therectangle. Notice that once all theconstraintsareapplied,therectangle turns green indicatingthat it is fully constrained. If it didnot turn green make sure theVisualization of diagnosisisactivated in the Options window.(Tools – Options )14CopyrightedMaterial1713) Draw the triangle shown using theProfilecommand. Whendrawing the triangle make sure thatthe top point is aligned with theorigin () and the bottom line ishorizontal (H).CopyrightedMaterial2.2 - 14

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial14) Constrain the vertical height of thetriangle to be 6 mm. Select theConstraintsicon, select theone of the angled lines of thetriangle, right click and selectVertical Measure Direction.446815) Constrainthe rest of thetriangle as shown.CopyrightedMaterial16) Exit the Sketchera length of 5 mm.and Padthe sketch toCopyrightedMaterialSection 5: Creating arcs.1) Enter the Sketchermiddle section.on the front face of theCopyrightedMaterial2.2 - 15Sketch face

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial2) Activate the Construction/Standard Elementicon.3) Select the Project 3D Elementsicon and thenproject the front face of the middle section.4) Deselect all.5) Deactivate the Construction/Standard Elementicon.CopyrightedMaterial6) Activate your Snap to Pointicon.7) Draw the profile shown. Use the Three Point Arccommand to create thebottom arc, the Arccommand to create the top arc. The Arc icons arestacked under the Circle icon. For assistance in creating the arcs, read theprompt line at the bottom of the graphics screen. UseCopyrightedMaterialthe Profilelines.command to create the connectingArcCenter pointfor arcCopyrightedMaterialThree point arc2.2 - 16

Chapter 2: SKETCHER: Tutorial 2.2CopyrightedMaterial8) Exit the Sketchera length of 30 mm.and Padthe sketch toCopyrightedMaterial9) Deselect all.10) Mirror the entire solid. Select the Mirroriconin the Transformation Features toolbar. S

An Introduction to CATIA V5 Chapter 2: SKETCHER 2 - 1 Chapter 2: SKETCHER Introduction Chapter 2 focuses on CATIA’s Sketcher workbench. The reader will learn how to sketch and constrain very simple to very complex 2D profiles. Tutorials Contained in Chapter 2 Tutorial 2.1: Sketch Work ModesFile Size: 1MBPage Count: 33