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Surfaces Overview
Surfaces are a type of geometry with zero thickness. To create surfaces, you use many of the same methods used to create solids, such as extrudes, revolves, and sweeps. Surfaces also use other functions or features such as trim, untrim, extend, and knit. Surfaces have advantages over solids. They are more flexible than solids because you do not have to define the boundaries between the surfaces until the final steps of the design. This flexibility helps product designers work with smooth, extended curves such as those used in automobile fenders or telephone housings. In this lesson, you start with an existing sketch composed of lines, arcs, splines, and sketch points. Then you apply the following surface features to create a nozzle: Next
Lofted Surface - Creating the Base
First, create the base for the nozzle using a surface loft between two arcs. Surface lofts include the same options as solid lofts. You can specify Start/End Tangency types, use Guide Curves , and so on. Click here Open Nozzle.sldprt , or browse to < _install_dir>_ samples \ tutorial \ surfaces \ nozzle.sldprt. (^) lofts sweeps (^) knits fills (^) planar revolve (^) move/copy (^) trim extend (^) untrim thicken Existing sketch Finished nozzle
For clarity, many images display only the sketches relevant to that procedure.
- Click (^) Lofted Surface on the Surfaces toolbar.
- Select (^) Sketch2 and (^) Sketch3 for (^) Profiles in the PropertyManager.
- Under Start/End Constraints : Select (^) Normal to Profile in (^) Start constraint and (^) End constraint. Set Start Tangent Length and End Tangent Length to 0..
- Click OK. Next
Create another swept surface for the exit nozzle.
- Click Swept Surface on the Surfaces toolbar.
- Select Sketch 9 for Profile in the PropertyManager.
- Select Sketch 7 for Path.
- Under Guide Curves : (^) Select Sketch 8 for Guide Curves. Select Merge smooth faces.
- Click OK. Next
Split Lines - Dividing the Exit Nozzle
The Split Line tool divides a face into multiple faces. This allows you to connect the base, the grip, and the exit nozzle with surface lofts. First, split the exit nozzle.
- Click Split Line on the Curves toolbar.
- In the PropertyManager, under Type of Split , select Projection.
- Under (^) Selections : Select (^) Sketch 10 for (^) Sketch to Project. Select the face of the exit nozzle for Faces to Split.
- Click (^) OK. Next
Split Lines - Dividing the Base
Next, split the base.
- Click Split Line on the Curves toolbar.
- In the PropertyManager, under (^) Type of Split , select (^) Projection.
- Under Selections :
- Click (^) OK. Next
Lofted Surface - Surface Bodies (continued)
Next, connect the base to the grip.
- Click Lofted Surface on the Surfaces toolbar.
- Select the edges on the base and the grip for (^) Profiles in the PropertyManager. Check the preview. If the profile is twisted, adjust the connector.
- Under Start/End Constraints : Select Tangency to Face for Start constraint and End constraint. Set (^) Start Tangent Length to (^) 3 , and (^) End Tangent Length to (^) 7. Apply the value of (^) 7 to the side near the grip.
- Under Options , select Merge tangent faces.
- Click OK.
Next
Lofted Surface - Surface Bodies (continued)
Finally, connect the base to the exit nozzle.
- Click Lofted Surface on the Surfaces toolbar.
- Select the edges on the base and the exit nozzle for (^) Profiles in the PropertyManager. If the profile is twisted, adjust the connector.
- Under (^) Start/End Constraints , select (^) Tangency to Face for (^) Start constraint and (^) End constraint.
- Under Options , select Merge tangent faces.
- Click OK.
- Select an edge, right-click and choose (^) Select Open Loop for (^) Patch Boundaries in the PropertyManager. Select Open Loop finds all the edges in a closed loop, creating the surface fill.
- Under (^) Edge settings : Clear Preview Mesh to display only the preview. Select (^) Tangent in (^) Curvature Control. Select Apply to all edges. Why did I do this?
- Click in Constraint Curves , and select Pull Point.
- Click (^) OK. Next
Filled Surface - Enclosing an Open Area (continued)
- Click Front to display the model in profile.
- Click Filled Surface on the Surfaces toolbar.
- Select an edge, right-click and choose Select Open Loop for Patch Boundaries in the PropertyManager.
- Under Edge settings : (^) Select Tangent in Curvature Control. Select (^) Apply to all edges.
- Click in (^) Constraint Curves , and select (^) Pull Point. Select an edge Select Open Loop
Next
Knit Surface - Joining the New Entities
Knit all the surfaces into a single entity.
- Click Knit Surface on the Surfaces toolbar.
- Expand Surface Bodies in the FeatureManager design tree.
- Select all the surface bodies in the folder for Surfaces and Faces to Knit.
- Click (^) OK. The Surface Bodies folder now holds a single surface body.
- Save the model. Next
Revolved Surface
Use the (^) Revolved Surface tool to create a surface that extends the nozzle base.
- Select Sketch13 in the FeatureManager design tree. click and choose Select Open Loop. The four sketch entities on the grip are selected.
- Click OK.
- Click Revolved Surface on the Surfaces toolbar.
- In the PropertyManager, under Revolved Parameters : Select One Direction in Revolve Type. Set (^) Angle to (^) 360.
- Click (^) OK. Next
Move/Copy Bodies - Moving a Surface
Move the revolved surface, and position it below the existing nozzle base with the (^) Move/Copy Bodies tool. This tool moves, rotates, or copies bodies and surfaces, and places the bodies in any position using coordinates.
- Click (^) Move/Copy Bodies on the Features toolbar.
- Select Remove selections.
- Click Pieces to Remove. The pointer changes to. Next
Trim Surface - Removing Surfaces (continued)
- Select the faces shown in the graphics area. You can select the faces for Pieces to Remove in any order. The list that appears in Pieces to Remove is based on your selection order, not on the entity you select. Surface-Knit2 Body-Move/Copy Surface-Knit2 Trim
- Click OK. Next
Extruded Surface - Creating a Trim Tool
With the Extruded Surface tool, create a trim tool at the base of the nozzle. Trimming the surface creates the first notch at the nozzle base. For clarity, switch the display to Hidden Lines Visible.
- Select Sketch. Body-Move/Copy1 Trim Before After
Coordinate System, or Vertex). Line1 is the axis used with Sketch13 to create the surface revolve. (^) Set Angle to 90.
- Click OK. Next
Trim Surface - Creating Cuts - Set 1
Create the first of two cuts at the base of the nozzle with the Trim Surface tool.
- Click (^) Trim Surface on the Surfaces toolbar.
- In the PropertyManager, under Trim Type , select Standard.
- Under (^) Selections : Select Body-Move/Copy2 in the graphics area for Trimming Surface, Plane, or Sketch
Select Keep selections. Select Surface-Trim1-Trim1 in the graphics area for Pieces to Keep.
- Click OK.
- Under Surface-Bodies in the FeatureManager design tree, right-click Body-Move/Copy2 , and select Hide Surface Body. Next
Trim Surface - Creating Cuts - Set 2
