6.0
Table Of Contents
- Getting Started with Autodesk® Mechanical Desktop®
- Autodesk® Mechanical Desktop® Tutorials
- Using the Tutorials
- Creating Parametric Sketches
- Constraining Sketches
- Creating Sketched Features
- Key Terms
- Basic Concepts of Sketched Features
- Creating Extruded Features
- Editing Extruded Features
- Creating Loft Features
- Editing Loft Features
- Creating Revolved Features
- Editing Revolved Features
- Creating Face Splits
- Editing Face Splits
- Creating Sweep Features
- Editing Sweep Features
- Creating Bend Features
- Editing Bend Features
- Creating Work Features
- Creating Placed Features
- Key Terms
- Basic Concepts of Placed Features
- Creating Hole Features
- Creating Thread Features
- Editing Hole Features
- Editing Thread Features
- Creating Face Drafts
- Editing Face Drafts
- Creating Fillet Features
- Editing Fillet Features
- Creating Chamfer Features
- Editing Chamfer Features
- Creating Shell Features
- Editing Shell Features
- Creating Surface Cut Features
- Editing Surface Cut Features
- Creating Pattern Features
- Editing Pattern Features
- Editing Array Features
- Creating Copied Features
- Editing Copied Features
- Creating Combined Features
- Editing Combined Features
- Creating Part Splits
- Editing Part Splits
- Using Design Variables
- Creating Parts
- Creating Drawing Views
- Creating Shells
- Creating Table Driven Parts
- Assembling Parts
- Combining Parts
- Assembling Complex Models
- Key Terms
- Basic Concepts of Complex Assemblies
- Starting the Assembly Process
- Creating Local and External Parts
- Applying Assembly Constraints
- Creating New Parts
- Creating Subassemblies
- Completing Assemblies
- Editing Mechanical Desktop Parts
- Reloading External References
- Reviewing Assembly Models
- Creating Bills of Material
- Finishing Drawings for Plotting
- Creating and Editing Surfaces
- Combining Parts and Surfaces
- Surfacing Wireframe Models
- Key Terms
- Basic Concepts of Surfacing Wireframe Models
- Surfacing Wireframe Models
- Creating Trimmed Planar Surfaces
- Joining Surfaces on Complex Shapes
- Creating Swept and Projected Surfaces
- Creating Complex Swept Surfaces
- Using Projection to Create Surfaces
- Using Advanced Surfacing Techniques
- Viewing Completed Surfaced Models
- Working with Standard Parts
- Creating Shafts
- Calculating Stress on 3D Parts
- Toolbar Icons
- Desktop Tools
- Part Modeling
- Part Modeling ‰ New Part
- Part Modeling ‰ New Sketch Plane
- Part Modeling ‰ 2D Sketching
- Part Modeling ‰ 2D Constraints
- Part Modeling ‰ Profile a Sketch
- Part Modeling ‰ Sketched Features
- Part Modeling ‰ Placed Features
- Part Modeling ‰ Work Features
- Part Modeling ‰ Power Dimensioning
- Part Modeling ‰ Edit Feature
- Part Modeling ‰ Update Part
- Part Modeling ‰ Part Visibility
- Part Modeling ‰ Options
- Toolbody Modeling
- Assembly Modeling
- Surface Modeling
- Surface Modeling ‰ AutoSurf Options
- Surface Modeling ‰ Swept Surface
- Surface Modeling ‰ Loft U Surface
- Surface Modeling ‰ Blended Surface
- Surface Modeling ‰ Flow Wires
- Surface Modeling ‰ Object Visibility
- Surface Modeling ‰ Surface Display
- Surface Modeling ‰ Stitches Surfaces
- Surface Modeling ‰ Grip Point Placement
- Surface Modeling ‰ Lengthen Surface
- Surface Modeling ‰ Extract Surface Loop
- Surface Modeling ‰ Edit Augmented Line
- Surface Modeling ‰ Wire Direction
- Scene
- Drawing Layout
- Mechanical View
- Index
276 | Chapter 12 Creating Parts
4 Create a horizontal dimension between the centers of the left and right arcs.
Select first object: Specify the left arc center (1)
Select second object or place dimension: Specify the right arc center (2)
Specify dimension placement: Place the dimension (3)
Enter dimension value or [Undo/Hor/Ver/Align/Par/aNgle/Ord/Diameter/pLace]
<0.9797>: Press
ENTER
5 Dimension the distance between the centers of the top and left arcs.
Select first object: Specify the left arc center (1)
Select second object or place dimension: Specify the top arc center (4)
Specify dimension placement: Create a horizontal dimension (5)
Enter dimension value or [Undo/Hor/Ver/Align/Par/aNgle/Ord/Diameter/pLace]
<0.5135>: Press
ENTER
6 Press ENTER to exit the command.
In this case, you do not change the values while you create the dimensions.
While a sketch is underconstrained, dimension changes can cause it to dis-
tort, and you may not be able to recover its correct shape.
Creating Constraints Between Features
The sketch geometry is now completely defined. However, to position the
sketch symmetrically on the base feature, you need to constrain the sketch to
the work plane and the work axis because they serve as centerlines for the part.
You use the project (PR) constraint to project points onto objects (similar to the
NEA object snap) and the concentric (C) constraint to force two arc or circle
centers to be coincident.
As you determined when you first analyzed the part,
■ The left and right arcs of the sketch form the lugs for the saddle bracket.
The arc centers must lie on the work plane.
■ The top and bottom arcs of the sketch form the base for the boss, in the
exact center of the part. The centers of both top and bottom arcs are coin-
cident with the intersection of the work plane and the work axis.
2
3
1
4
5