Chapter 3 Creating and Editing Sketched Features.
-
Upload
garry-ross -
Category
Documents
-
view
235 -
download
3
Transcript of 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.