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 Use the Autodesk Inventor browser to edit parts 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

Browser Autodesk Inventor Browser Displays the history of the file Create, edit, rename, copy, delete, and reorder features or parts Expanded or Collapsed

Using the Browser for creating and editing Autodesk Inventor Browser Dependent features Parent-child relationship Filter out object types Funnel icon

Using the Browser for creating and editing Autodesk Inventor Browser Default names Extrusion1 Locate parts and features Resized while docked Close Browser Right-click Double-click

Switching Environments Sketch & Part environment Automatically Tools available to current situation

Part Features Feature Tools Part environment Panel Bar icons 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.

Extruding a Sketch Extruding a Sketch Depth along Z-axis Preview Extrude dialog box Shape & More tabs Values & options Shape Profile Multiple closed profiles

Extruding a Sketch Extruding a Sketch Operation Extents Termination Join = adds Cut = removes Intersect = common Extents Type & Distance Termination How sketch will extrude Distance To Next From To To All

Extruding a Sketch Extruding a Sketch Output More Solid Surface Taper Alternate solution Minimum solution 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 Extents Full Angle Output Solid Surface

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 type For base features, everything can be changed except join operation Feature Priority

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 Move Feature Move a face of a part 3D Grips Triad move

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 Undo Sketch Doctor

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 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

Project Exercise – Chapter 3 Creating and Editing Sketched Features In Appendix A

Checking Your Skills What is a base feature? True_ False_ When creating a feature with the Extrude or Revolve tool, 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 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 termination cannot be changed. True_ False_ Geometry that is projected from one feature to a sketch that defines another feature will update automatically based on changes to the original projected geometry.