SKETCHER

About Creating Geometry in Sketcher

To start sketching, select an option from the Sketcher toolbar or the Sketch menu. Create entities

by clicking points inside the Sketcher window.

As you move the mouse pointer, Sketcher determines applicable constraints and displays them; Creo

Parametric displays the active constraint in red. As you create geometry it snaps to satisfy these

constraints (for example, horizontal or vertical line constraint).

After the entities are sketched, you can apply additional constraints by selecting the Constrain

option in the Sketch menu.

You use the mouse in Sketcher in different ways:

• Use the left mouse button to pick points on the screen and the middle mouse button to abort

the current action.

• Press SHIFT and click the left mouse button to switch between circle and ellipse creation.

You can use the same mouse operation to switch between circular fillet and elliptical fillet

creation.

• While you are sketching, you can disable the current constraint (shown in red) by pressing

the right mouse button and lock the constraint by pressing SHIFT and the right mouse button.

• Press CONTROL and click the left mouse button to gather selected items.

• You can click the right mouse button menu for a shortcut menu with frequently used

sketching commands (while you are not in the rubberband mode).

The system automatically dimensions geometry as you sketch entities by adding only those

dimensions that are necessary to solve the section. The system dimensions are called "weak"

dimensions (they appear in gray), because the system can remove or change them without your input.

Use the Dimension option in the Sketch menu to add "strong" dimensions (they appear in yellow

To Create a Line 1. Click Sketch > Line.

2. Click at the location at which you want to start the line. A "rubberband" line appears attached to

the cursor.

3. Click at the location at which you want the line to end. Creo creates a line between the two points

and starts another rubberband line.

4. Repeat Step 3 to create additional lines.

5. Click the middle mouse button to end line creation. The rubberband line disappears

To Create a Centerline Centerlines are used to define the axis of revolution of a revolved feature, to define a line of

symmetry within a section or to create construction lines. Centerlines have infinite length and are not

used to create feature geometry.

1. Click Sketch > Line> Centerline.

2. Click to select a location at which to intersect the centerline. A centerline appears attached to the

cursor.

3. Click a second location at which to intersect the centerline. Creo Parametric creates a Centerline

between the two points.

To Create a Line Tangent to Two Entities 1. Click and then click located in the Line creation fly-out or Sketch > Line > Line Tangent.

2. Select a start location on an arc, circle. Use middle mouse button to end the command.

3. Select an end location on an arc, circle. Use middle mouse button to end the command

To Create a Rectangle 1. Click Sketch > Rectangle.

2. Place one vertex with the left mouse button and drag the rectangle to the desired size.

3. To place the other vertex, click the left mouse button.

The four lines of the rectangle are independent. You can handle them (trim, align, and so forth)

individually.

To Create a Circle 1. Click Sketch > Circle. The default circle type is Center/Point.

2. Click on the arrow to the right of the Circle button to select the creation method.

Center/Point—create a circle by picking the center point and a point that lies on the circle.

Concentric—Create a concentric circle. Select a reference circle or an arc to define the center point.

As you move the cursor, the circle rubber bands until you press the left mouse to finish. The selected

referenced circle can be a sketched entity or a model edge. If the selected circle reference is a mod

To Create a Circle Tangent to Three Entities 1. Click and then click located in the Circle creation fly-out or Sketch > Circle > 3 Tangent.

2. Select a start location on an arc, circle, or line. Use middle mouse button to end the command.

3. Select an end location on an arc, circle, or line. Use middle mouse button to end the command.

4. Select a third location on an arc, circle, or line. Use middle mouse button to end the command

To Create a Circle through Three Points 1. Click and then click located in the Circle creation fly-out or Sketch > Circle > 3 Point.

2. Select a start location on an arc. Use middle mouse button to end the command.

3. Select the first point on the circle.

4. Select the second point on the circle.

5. Select the third point on the circle

To Create an Ellipse 1. Click Sketch > Circle > Ellipse.

Note: You can also use this command by clicking the Ellipse button in the Sketcher toolbar.

2. Click the center of the ellipse.

3. Drag the ellipse to the desired shape and click the left mouse button to finish.

4. Once the center and the corner of the defining rectangle of the ellipse are selected, the sketch is

created and two dimensions, Rx and Ry are placed in the sketch. The dimensions Rx and Ry define

the length of the X and Y axis of the ellipse. The following figure is an example of an ellipse.

To Create a Conic 1. Click Sketch > Arc > Conic.

2. Pick the first endpoint for the conic using the left mouse button.

3. Pick the second endpoint for the conic using the left mouse button.

4. Pick the location for the shoulder using the left mouse button. The conic rubber bands as you move

the cursor.

To Create an Arc

1. Click Sketch > Arc.

2. Select one of the following creation methods from the ARC menu:

o 3 Point/Tangent End— create a 3-point arc by picking its endpoints and an additional point on

the arc. To create a tangent arc, pick an endpoint of an existing entity to determine tangency, and

then pick a location for the other endpoint of the arc.

o Concentric—Create a concentric arc. Select an arc to use its center, rubberband to the desired

radius, and sketch the arc.

o Center/Ends—Create an arc by picking the center point of the arc and the endpoints of the arc.

Example: Creating an Arc using a Target When you create a 3 Point/Tangent End Arc on an existing endpoint, Sketcher displays a target

symbol attached to the endpoint. To create a 3 point arc, drag the cursor out of a quadrant

perpendicular to the end of the entity. To create a tangent end arc, drag the cursor out of a quadrant

tangent to the end of the entity.

1. Endpoint

2. Existing Geometry

3. Quadrants for 3 Point Arc creation

4. Quadrants for tangent end are creation.

To Create a Fillet Arc The Fillet option creates a rounded intersection between any two entities. The size and location of

the fillet depends on the pick locations.

1. Click Sketch > Fillet > Circular.

2. Click the first line using the left mouse button.

3. Click the second line using the left mouse button. Creo Parametric creates a fillet from the selected

point that is closest to the intersection point of the two lines and trims the lines to the intersection

point.

Sketching a Fillet Arc The Fillet option creates a rounded intersection between any two entities. The size and location of

the fillet depends on the pick locations.

You cannot create a fillet between the following entities:

� Parallel lines

� A centerline and another entity

When a fillet is inserted between two entities, the system automatically divides two entities at the

fillet tangency points. If you add the fillet between two non-parallel lines, the lines are automatically

trimmed to the fillet. If you add the fillet between any other entities, you must delete leftover

segments manually.

Example: Fillet Arcs Fillets Between Different Entities

1. Fillets between lines, splines and circles

2. Division points

3. Resulting geometry after deleting entities between division points

To Create an Arc Tangent to Three Entities 1. Click and then click located in the Arc creation fly-out or Sketch > Arc > 3 Tangent.

2. Select a start location on an arc, circle, or line. Use middle mouse button to end the command.

3. Select an end location on an arc, circle, or line. Use middle mouse button to end the command.

To Create an Elliptical Fillet The axes of the elliptical fillet are horizontal and vertical. The elliptical fillet is tangent at its

endpoints to the entities selected for its creation. For this operation, you can select the same entities

as for Arc, Fillet.

1. Click Sketch > Fillet > Elliptical.

2. Click the entities between which you want to create an elliptical fillet.

To Create a Spline Splines are curves that pass smoothly through any number of intermediate points.

1. Click or Sketch > Spline.

2. Click in the Sketcher window to add points to the spline. A "rubberband" spline appears attached

to the cursor.

3. Repeat Step 2 to add additional spline points. Click the middle mouse button to end spline

creation.

Using a Coordinate System You can add a coordinate system to a section to be used with the following:

• Spline—You can dimension a spline to a coordinate system. This allows you to modify the spline

points by specifying the x-, y-, and z-axis coordinates with respect to the coordinate system.

• Reference—You can add coordinate systems to any section to aid dimensioning.

• Blend feature section—You can use the coordinate system to establish the relative origin for each

of the sections used for blends.

To Create a Coordinate System 1. Click Sketch > Coord Sys.

2. Click a location to locate the coordinate system.

Creating an Axis Point

Use the Axis Point option from the Sketch menu to create an axis that is normal to the sketching

plane. The depth of the axis is determined by the geometry of the feature and is similar to an axis of a

cylindrical hole.

You can use the axis created with the Axis Point option for referencing and dimensioning both in

Sketcher and throughout Creo Parametric. The axis point behaves as an axis created with Datum >

Axis in Part mode. You can include the Sketcher axis in a punch UDF and slot.

To Create an Axis Point 1. Click Sketch > Axis Point.

2. Click a point.

3. The system creates an axis through the point.

To Create Text in Sketcher 1. Click Sketch > Text and select a start point on the sketching plane to set text height and

orientation.

2. Click an end point. Sketcher creates a construction line between the start point and the end point.

The length of the construction line determines the height of the text, while the angle of the line

determines the text orientation. The Text dialog box opens.

3. Under Text line, select Enter text manually or Use parameter.

• Enter text manually—Type a single line of up to 79 characters of text.

If required, click Text Symbol to insert special text symbols. The Text Symbol dialog box opens.

Select the symbol that you want to insert. The symbol appears in the Text line box and in the

graphics area. Click Close to close the Text Symbol dialog box.

• Use Parameter—Allows you to select a parameter that you have defined. The value of the

parameter is displayed on the screen.

a. Click Use Parameter. The Select Parameter dialog box opens.

b. Under Look In, select Part, Feature, Annotation Element, Surface, or Edge to determine the

object type. The name of the object type you select, appears in the Look In box.

c. Select a parameter from the Parameters Table and click OK. The name of the selected parameter

appears in the Text line box and cannot be modified. The value of the parameter is displayed on the

screen.

4. You can specify any of the following under Font in the Text dialog box.

• Font—Select a type face from a list of PTC-supplied fonts and TrueType fonts.

• Aspect ratio—Use the slide bar to increase or decrease the aspect ratio of your text.

• Slant angle—Use the slide bar to increase or decrease the slant angle of your text.

• Place along curve—Click this box to place your text along a curve and select the curve on

which you want to place the text. Creo Parametric prompts you to select the direction in

which you want the text to flow. Click Flip to change the direction.

5. Click OK to create the text. If you have selected Enter text manually, then the text is created on

the sketching plane and if you have selected Use parameter, then the value of the parameter is

displayed in the current sketcher window.

To Trim and Extend Entities 1. Bring the pointer over the entity that you want to trim. The entity is highlighted.

2. Holding down the CONTROL key, drag the endpoint of the entity that you want to trim. The entity

is trimmed or extended in the direction in which you drag it. At every intersection, the constraint that

it created is displayed.

To Trim Entities to Each Other 1. Click Edit > Trim > Corner. Creo Parametric prompts you select two entities to trim.

2. Click any two entities (they do not have to intersect) on the portion of the entity that you want to

keep. Creo Parametric trims the two entities together

Mirroring Geometry

Use the Mirror command from the Edit menu to mirror Sketcher geometry about a sketched

centerline. For example, you can create half of the section and then mirror it.

Creo Parametric uses the dimensions of one side to solve the other. This reduces the number of

dimensions necessary to solve the section. When you mirror geometry, Sketcher mirrors constraints

too.

To Mirror Geometry 1. Make sure the sketch contains a centerline.

2. Select an entity or multiple entities to mirror.

3. Click Edit > Mirror.

4. Click a centerline. The system mirrors all selected geometry about the selected centerline.

Utilizing constrains:

Constrains are rules enforced by creo parametric on your sketched entities.

Constraining the sketches is an important means to capture design intent. As you add constraints, you

add logic to your sketches. You also minimize the number of dimensions required to document your

design intent. This is why it is important to constrain your sketched entities before dimensioning your

sketch.

The following table list the available constraints, which can be activated from the constain

group in the sketch tab of the ribbon, or by selecting multiple entities and right-clicking.

Constraint Description

Vertical Makes lines vertical or aligns point vertically

Horizontal Makes lines horizontal of aligns points horizontally.

Perpendicular Makes lines perpendicular to one another.

Tangent Makes lines tangent to arcs and circles.

Midpoint Places a point on the middle of a line or arc.

Coincident Aligns two entities or vertices to the same point. Also creates collinear

and point on entity constraints.

Symmetric Makes two points or vertices symmetric about centerline.

Equal Makes lines equal length, gives arcs/circles equal radii, makes

dimensions equal, or creates equal curvature.

Parallel Makes lines parallel to one another.

PARTMODELING

Creo Parametric Part enables you to design models as solids in a progressive three-dimensional solid

modeling environment. Solid models are geometric models that offer mass properties such as

volume, surface area, and inertia. If you manipulate any model, the 3-D model remains solid.

Creo Parametric provides a progressive environment in which you create and change your models

through direct graphical manipulation. You drive the design process for your project by selecting an

object (geometry) and then choose a tool to invoke an action on that object. This object-action

workflow provides greater control over the design of your models while allowing you to express your

creativity. The user interface provides further support for this design process

As you work with your model, the context sensitive user interface guides you through the design

process. After you choose an object and an action, Creo Parametric interprets the current modeling

context and presents requirements and optional items to complete the task. This information is

displayed in a non obtrusive user interface called the dashboard that enhances your ability to directly

work with your models by assessing your actions and guiding you through the design process.

The Creo Parametric progressive modeling environment streamlines the design process enabling you

to concentrate on product development and drive your designs to new levels of creativity.

Design Concepts You can design many different types of models in Pro/ENGINEER. However, before you begin your

design project, you need to understand a few basic design concepts:

• Design Intent—Before you design your model, you need to identify the design intent.

Design intent defines the purpose and function of the finished product based on product

specifications or requirements. Capturing design intent builds value and longevity into your

products. This key concept is at the core of the Pro/ENGINEER feature-based modeling

process.

• Feature-Based Modeling—Pro/ENGINEER part modeling begins with creating individual

geometric features one after another. These features become interrelated to other features as

you reference them during the design process.

• Parametric Design—The interrelationships between features allow the model to become

parametric. So, if you alter one feature and that change directly affects other related

(dependent) features, then Pro/ENGINEER dynamically changes those related features. This

parametric ability maintains the integrity of the part and preserves your design intent.

• Associativity—Pro/ENGINEER maintains design intent outside of Part mode through

associativity. As you continue to design the model, you can add parts, assemblies, drawings,

and other associated objects, such as piping, sheet metal, or electrical wiring. All of these

functions are fully associative within Pro/ENGINEER. So, if you change your design at any

level, your project will dynamically reflect the changes at all levels, preserving design intent.

Features and Parts All models that you build contain the following fundamental anatomical attributes:

• Features—Individual geometry created one at a time. Features include datums, extrusions,

holes, rounds, chamfers, surface features, cuts, patterns, sweeps, etc. You can have multiple

features in a part.

• Parts—Collection of geometric features that define the geometric entity called the part. Parts

are referred to as components in an assembly. You can have multiple components in an

assembly.

• Assemblies—Collection of components assembled together to create the model. You can

have multiple assemblies and subassemblies in a hierarchical order according their

relationships with other assemblies and the master assembly.

Parent-Child Relationships You can use various types of Pro/ENGINEER features as building blocks in the progressive creation

of solid parts. Certain features, by necessity, precede other more dependent features in the design

process. Those dependent features rely on the previously defined features for dimensional and

geometric references. This is known as a parent-child relationship.

The parent-child relationship is one of the most powerful aspects of Pro/ENGINEER and parametric

modeling in general. This relationship plays an important role in propagating changes across the

model to maintain the design intent. After a parent feature in a part is changed, all children are

dynamically altered to reflect the changes in the parent feature. If you suppress or delete a parent

feature, Pro/ENGINEER prompts you for an action pertaining to the related children. You can also

minimize the cases of unnecessary or unintended parent-child relationships.

It is therefore essential to reference feature dimensions so that Pro/ENGINEER can correctly

propagate design changes throughout the model. When working with parent-child relationships, it

can be helpful to remember that parent features can exist without child features. However, child

features cannot exist without their parents.

Part modeling

Introduction Extrusions are one of the most basic ways to design a part in Creo, and sketching is an important part

of the design process. In this section, you will learn basic operations by creating a simple part using

an extruded protrusion. You will then modify the part using a cutting operation.

Starting Creo and Creating new Part 1. Start Pro/E Wildfire.

2. Select [File] -> [New] from the menu bar. The dialog shown in Figure 1.1 will pop up.

3. Type the part name [Example1] in Text Box.

4. Click [OK] button (or press Enter Key). You will see the screen shown in Figure 1.2.

Sketching and Protrusion

1. Select the Extrude Tool icon from the tool bar on the top ribbon of the screen, as shown in Figure

1.2.

2. Select the plane of your choice Top, Front, Right. This will allow you to sketch in the two axis and

extrude to normal to the selected plane.

3. Creo will switch to Sketch Mode, and you will see the screen as shown in Figure.

4. Now sketch the shape as required from geometry menu. Note: Section should be closed for

creating solid.

5. Double click on each dimensions and give the required dimensions to convert the weak

dimensions in to required strong dimension.

6. Zoom in using the wheel on the mouse or by moving the mouse up and down while holding CTRL

and middle mouse button.

7. Move the sketch to the center of the screen by moving the mouse while holding the middle mouse

button and the Shift key.

8. Once the sketch is finished Select the OK menu button to exit the sketch.

9. If you followed the instructions correctly, you will see the three-dimensional image shown in

Figure .

10. Once the base feature is created the designer the reamove the material by using the same

extrude command by clicking the remove material icon

11. Clicking on the icon extrude the sketch on both side of the

12. Clicking on this icon will extrude the sketch up to the next intersecting surface.

Once the base feature is created the designer the reamove the material by using the same

xtrude command by clicking the remove material icon.

Clicking on the icon extrude the sketch on both side of the sketching plane.

will extrude the sketch up to the next intersecting surface.

Once the base feature is created the designer the reamove the material by using the same

plane.

will extrude the sketch up to the next intersecting surface.

13. Clicking on this icon will extrude the sketch up to last interesting surface.

14.