Chapter 3 Creating 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 Sketch & Part environment Tab changes automatically Commands available for current environment

Model Commands Commands Model environment Model tab Right-click in graphics window Extracting iFeatures and iPart Author have been moved to the Tools Pulldown –due to frequency of use. You may customize the PanelBar through the right mouse context menu item “Customize…” when over the toolbar. Just use the Commands tab in the part category and you may drag the item to the panelbar.

Direct Manipulation Mini-Toolbars In-Canvas Display Sketch Face Edge 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 Extents Direction 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 More Solid Surface Taper Alternate solution Minimum solution Infer iMates Alternate solutions allows the user to choose between two possible logical solutions when multiple solutions to an extrusion exist. The logic of the alternate solution toggles the user between minimum and maximum material results (minimum being the default –top image displayed above).

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 Surface

Revolving a Sketch More Tab Alternate solution Minimum solution Infer iMates Alternate solutions allows the user to choose between two possible logical solutions when multiple solutions to an extrusion exist. The logic of the alternate solution toggles the user between minimum and maximum material results (minimum being the default –top image displayed above).

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) Use natural planar faces of the part or the default Origin planes of the part to create the 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 Select Other is also available through the Context Menu if you don’t want to wait for the time delay during hover or if the glyph does not seem to be appearing.

Slice Graphics Slice Graphics Active Sketch Obscuring the view Plane that is difficult to see Temporarily slice away Parts or assemblies Technical Note The sliced graphics texture can cause performance issues on some machines. Go to Tools>Application Options>Colors and deselect Show Reflections and Textures. This will turn off display of reflections and color styles that use textures.

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 Try to avoid creating projected loops (disjoint) that may merge in later edits –this will lead to the loops failing.

Applying Your Skills Skill Exercise 3-1 Skill Exercise 3-2 Skill Exercise 3-3

Checking Your Skills What is a base feature? True_ False_ When creating a feature with the Extrude or Revolve command, you can drag the sketch to define the distance or angle. Which objects can be used as an axis of revolution? Explain how to create a linear diameter (diametric) dimension on a sketch. Name two ways to edit an existing feature. True_ False_ Once a sketch becomes a base feature, you cannot delete or add constraints, dimensions, or objects to the sketch. Name three operation types used to create sketched features. True_ False_ A cut operation cannot be performed before a base feature is created. True_ False_ Once a sketched feature exists, its extents type cannot be changed. 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.