chapter 3 creating and editing sketched features

Chapter 3Creating and Editing Sketched Features

Chapter 3 - Objectives• After completing this chapter, you will be able to

perform the following:– Understand what a feature is – Understand Autodesk Inventor browser– Use direct manipulation techniques to create and edit a part– Extrude a sketch into a part– Revolve a sketch into a part– Edit features of a part– Edit the sketch of a feature– Make an active sketch on a plane– Create sketched features using one of three operations: cut,

join, or intersect– Project edges of a part

Understanding Features• Describing Features

• Sketch into a 3D feature

• Base feature

• Placed features

• Edited, deleted, or reordered

–Consumed and Unconsumed Sketches

• Unconsumed sketch– not yet been used in a

feature

• Profiles– Feature consumes the

profile

• Consumed sketch

Use Browser to Create and Edit• Autodesk Inventor

Browser– Default names

• Extrusion1

• Revole1

– Locate parts and features– Resized while docked– Close Browser– Right-click – Double-click

Switching Environments

• Switching Environments– Sketch & Part environment

• Tab changes automatically• Commands available for current environment

Model Commands• Commands

– Model environment• Model tab• Right-click in graphics window

Direct Manipulation• Mini-Toolbars

– Sketch– Face– Edge

• In-Canvas Display– Dialog box information

Extruding a Sketch• Extruding a Sketch

– Depth along Z-axis– Preview– Extrude dialog box

• Profile– Multiple closed profiles

• Solids• Operation• Extents• Distance value• Direction

Extruding a Sketch•Extruding a Sketch

–Operation• Join = adds• Cut = removes• Intersect = common• Solid = new solid body

–Extents• Distance • To Next• To• Between• All

–Direction

Extruding a Sketch• Extruding a

Sketch– Output

• Solid• Surface

– More• Taper • Alternate

solution• Minimum

solution• Infer iMates

Exercise 3-1

• Extruding a Sketch

Revolving a Sketch• Revolving a Sketch

– Create cylindrical parts– Revolve sketch around a straight edge or axis – Shape

• Profile• Axis

– Operation• Join• Cut• Intersect• Solid

– Extents• Full, Angle, To Next,• To, Between, Full

– Output• Solid• Surface

Revolving a Sketch– More Tab

• Alternate solution

• Minimum solution

• Infer iMates

Revolving a Sketch• Centerlines & Linear

Diameter Dimensions– Specify linear diameter

dimensions– Quarter section– Place diameter

dimensions• Changed to normal line

to centerline

Exercise 3-2

• Revolving a Sketch

Editing a Feature• Editing a Feature

– Feature consumes all the dimensions

– To edit sketch or feature• Dimensions values• Taper• Operation• Termination • Output

– For base features, everything can be changed except the join operation

– Feature Priority (Select Features)

Editing a Feature•Editing a Feature’s Sketch

–Add & remove objects–Adding geometry, lines, arcs, circles and splines

–Delete geometry

Editing a Feature• 3D Grips

– Used to push or pull the faces

• Extruded feature• Revolved feature• Sweep feature

– Red = Cut operation, – Green = Joined operation– Blue = Intersect operation

Editing a Feature• Editing a Feature

– Renaming Features and Sketches• Default name• Locate• Descriptive to your design intent• Rename, slowly double-click

– Feature Color• Feature Properties dialog box

Deleting a Feature•Editing a Feature

–Deleting a Feature–Failed Features

• Browser turns Red, an alert• Not successfully regenerated• Edit• Undo

Exercise 3-3

• Editing Features and Sketches

Sketched Features• Sketched Features

– You sketch on a plane– Add or remove material

from the part– Needs it’s own plane

(planar face or based on a work plane)

Defining the Active Sketch Plane•Defining the Active Sketch Plane

–Each sketch must exist on its own plane–Requirements to assign a plane

• Inventor Part

• Part active

• Planar face or Work plane

–Make a sketch active•Face Cycling

–Dynamic face highlighting–Help select the correct face–Select Other tool–Time delay

Slice Graphics• Slice Graphics

– Active Sketch• Obscuring the view • Plane that is difficult to see • Temporarily slice away • Parts or assemblies

Exercise 3-4

• Sketch Planes

Projecting Part Edges• Projecting Part Edges

• Building parts partially based on existing geometry• Reference faces, edges, or loops• Associative link

– Direct Model Edge Referencing• Automatically project edges• Create dimensions and constraints• Control the automatic projection

Projecting Part Edges• Projecting Part Edges

– Creating Reference Geometry• Move the cursor over an edge• Click an edge• Reference edges

– Project Loop and Chain Option• Project Geometry tool• Edges• Loops• Faces

– Break Link

Applying Your Skills

Skill Exercise 3-1 Skill Exercise 3-2 Skill Exercise 3-3

Checking Your Skills1. What is a base feature?2. True_ False_ When creating a feature with the Extrude or Revolve

command, you can drag the sketch to define the distance or angle.3. Which objects can be used as an axis of revolution?4. Explain how to create a linear diameter (diametric) dimension on a

sketch.5. Name two ways to edit an existing feature.6. True_ False_ Once a sketch becomes a base feature, you cannot

delete or add constraints, dimensions, or objects to the sketch.7. Name three operation types used to create sketched features.8. True_ False_ A cut operation cannot be performed before a base

feature is created.9. True_ False_ Once a sketched feature exists, its extents type cannot be

changed.10.True_ False_ By default geometry that is projected from one feature to a

sketch will update automatically based on changes to the original projected geometry.