Chapter 7 Advanced Part Modeling Techniques

Chapter 7 - Objectives After completing this chapter, you will be able to perform the following: Create ribs, webs, and rib networks Emboss text and profiles Create sweep features Create coil features Create loft features Split a part or split faces of a part Bend a part

Chapter 7 - Objectives After completing this chapter, you will be able to perform the following: Reorder part features Mirror model features Suppress features of a part Create a derived part based on another part or an assembly Shrinkwrap an assembly Create plastic and cast features

Rib and Web Features Rib and Web Features Used to reinforce or strengthen features Additional support and minimal weight are required mold and cast parts Ribs, webs, and rib networks Single, open, unconsumed profile Taper Design features to be robust (similar to open profiles). Extending the profile and using To Next terminations add flexibility into the part model and these features are less likely to fail or run into problems as the design is revised.

Rib and Web Features Rib and Web Features Rib dialog box Shape Profile Direction Thickness Edit Box Flip Buttons Extents To Next Finite Extend Profile Taper

Rib and Web Features Creating Rib and Web Rib Networks Use multiple intersecting or nonintersecting sketch objects Thickness is applied to all objects Rib Network as a Profile Ribs Webs

Exercise 7-1 Creating Ribs and Webs

Emboss Text and Closed Profiles Emboss Text / Closed profile Embossed (raised) Engraved (cut) Shape or Text Geometry Text On a plane or a curved face Step 1 - Creating Text Step 2 - Emboss Text

Exercise 7-2 Creating Text and Emboss Features

Sweep Features Sweep Features Requires two unconsumed sketches Sweep dialog box Profile Path Operation buttons Solid / Surface Taper Type Orientation

Sweep Features Profile Path Orientation

Sweep Features Type - Path & Guide Rail Profile Scaling X & Y X None

Sweep Features Type - Path & Guide Surface Path Profile Guide Surface

Exercise 7-3 Creating Sweep Features

3D Sketching Defining a 3D path Lip or routing Work points Model edges/vertices 3D Sketch Environment 2D & 3D curves

Sweep Features 3D Sketching 3D Path From Existing Geometry Define path Use existing edges Include Existing Geometry Projecting part edges, vertices, and geometry

3D Sketching 3D Sketch From Intersection Geometry Defined by a combination Planar or nonplanar part face Surface face or quilt Objects Work plane Multiple faces/surfaces may be used in the second selection set to create the 3D intersection curve. 3D Intersection Curves are similar in concept to projected loops within 2D sketches… If the geometry is modified that creates the curve, the intersection will be recomputed and update the 3d intersection curve.

3D Sketching Project to Surface Project Along Vector Project to Closest Point Wrap to Surface Break Link Multiple faces/surfaces may be used in the second selection set to create the 3D intersection curve. 3D Intersection Curves are similar in concept to projected loops within 2D sketches… If the geometry is modified that creates the curve, the intersection will be recomputed and update the 3d intersection curve.

3D Sketching Constructed Paths Connecting Auto-Bend Work points 3D line Auto-Bend Radius

Sweep Features 3D Sketching Work Points Grounded Work Points Constraints 3D Lines and Splines Precise Input

Exercise 7-4 3D Sketch – Sweep Features

Coil Features Coil Features - Helical, springs or coil shapes Profile Axis Flip Rotation Operation Coil Size Type Pitch Revolution Height Taper

Coil Features Coil Features Coil Ends Using base & secondary feature Start End Transition Angle Flat Angle Using base & secondary feature

Loft Features Loft Features Blends a shape between two or more sections Area Loft Complex shapes Plastic or molded parts Sections Rails Center Line Points Curves

Loft Features Curves Sections Rails Center Line Output Operation Closed Loop Merge tangent Faces Area The fewer elements used to create the loft sections the easier is will be to control the shape Stay away from over constrained situations (if start and end tangency exist, it is better to not use a rail even if it has those conditions)

Loft Features Conditions Condition Boundaries Sketches Free Condition Direction Condition Condition Boundaries Face Loop Smooth (G2) Condition Angle Weight The fewer elements used to create the loft sections the easier is will be to control the shape Stay away from over constrained situations (if start and end tangency exist, it is better to not use a rail even if it has those conditions)

Loft Features Loft Features Transition Point Set Map Point Position

Exercise 7-5 Creating Loft Features

Multi-Body Parts Create a solid body in a part file Derive a solid body into a part file Split Part into solid bodies

Multi-Body Parts Edit solid bodies Move bodies Combine

Multi-Body Parts Export solid body Make Part Make Components

Split a Solid, Part or Face Part Split and Face Split Method Split Face Trim Solid Remove Material Split Solid Split dialog box Split Tool Faces All Select

Exercise 7-6 Splitting a Part into Multiple Bodies

Bend Part Bend a part A bend line Radius + Angle Radius + Arc Length Arc Length = Angle

Mirroring Features Mirroring Features Features Mirror Entire Solid Dependent on the parent feature Mirror Plane Creation Method Change or update Mirror Entire Solid

Suppressing Features Suppressing Features Temporarily turn off display Simplify parts Increases system performance Unsuppress Parent – child relationships

Conditionally Suppress Features Feature Properties Parameter Value – If statement

Reordering Features Reordering Features Browser Drag horizontal line

Feature Rollback Feature Rollback Roll back the design to an earlier state Then place new features Reorder Delete all features below EOP

Derived Parts In a Part (IPT) file Options Operations Scale Factor Body Work Surface Sketches 3D Sketches Work geometry Surfaces Exported Parameters iMates Operations Mixed Plus Exclude Scale Factor Mirror Part

Derived Assemblies In a Part (IPT) file Operations Combination Plus Exclude Minus Bounding Box Keeps seems between planar faces Reduced Memory Mode Update Break Link

Exercise 7-7 Creating a Derived Part

Shrinkwrap Reduce detail Protect intellectual property Reduce file size Create a substitute part for use with alternative representations Create simplified data for complex purchased assemblies

Shrinkwrap Remove detail by setting Visibility By Size Holes patching Object type

Exercise 7-8 Shrinkwrap

Plastic and Cast Part Features Silhouette Curves—Parting Line Create a curve at the outermost boundary of the selected faces Select a direction Then create a surface that will be used as a split tool

Plastic and Cast Part Features Grills Create a grill feature from a simple sketch Create a sketch Create feature - fill in information in dialog box

Plastic and Cast Part Features Bosses Creates a boss feature to hold a fastener Place sketch point(s) or work point(s) Create feature - fill in information in dialog box

Plastic and Cast Part Features Rests Create flat area the goes partially inside and outside a part Create a sketch Create feature - fill in information in dialog box

Plastic and Cast Part Features Snap Fit Creates a mechanism that is used to hold two parts together Place sketch point(s) or work point(s) Create feature - fill in information in dialog box

Plastic and Cast Part Features Rule Fillet Creates a fillet based on a set of rules that dictate when edges touch certain faces or features, fillets will automatically be created Rules All Edges, Against Part, Against Features or Free Edges

Plastic and Cast Part Features Lip Creates lips and grooves that join two parts together at their parting lines Lips add material and grooves remove material Create feature - fill in information in dialog box

Exercise 7-9 Plastic Part

Part Materials Part Materials Physical tab or Properties dialog box Mass is calculated from material Part color set to As Material Color = As Material

Override Mass & Volume Properties Mass and volume values Default & Overridden Copy information to clipboard

Applying Your Skills Skill Exercise 7-1

Checking Your Skills True__ False__ When creating a rib or a web feature, you can only select a closed profile. True__ False__ You can only emboss text on a planar face. True__ False__ A sweep feature requires three unconsumed sketches. True__ False__ In a 3D Sketch the Project Geometry command is used to project curves onto a circular face. True__ False__ You can create a 3D curve with a combination of both 2D and 3D curves. Explain how to create a 3D path using geometry that intersects with a part. True__ False__ The easiest way to create a helical feature is to manually create a 3D path and then sweep a profile along this path. True__ False__ You can control the twisting of profiles in a loft by defining point sets. Explain how to split a part into two solid bodies and then save them to their own part file. Explain the difference between suppressing and deleting a feature. True__ False__ After mirroring a feature, the mirrored feature is always independent from the parent feature. If the parent feature changes, the mirrored feature will NOT reflect this change. True__ False__ A derived part cannot be scaled. True__ False__ The Shrinkwrap command can only patch voids created from a hole feature. True__ False__ When creating a lip feature with the Lip command, you must first create a 3D path. Explain why you would want to override a part’s mass and volume properties.