Part Modeling > Base Features > Blends > Rotational Blends > To Create a Rotational Blend by Sketching the Sections
To Create a Rotational Blend by Sketching the Sections
1. Click Model > Shapes > Rotational Blend. The Rotational Blend tab opens.
2. Click to create a solid feature, or click to create a surface feature.
3. To use an internal or external sketch as the first section, click , or select Sketched sections on the Sections tab.
4. Create the first section by performing one of the following procedures:
Sketch an internal section:
1. Click the Sections tab, and click Define next to the Sketch collector. The Sketch dialog box opens.
2. To define the sketch plane for the first section, select a planar surface or datum plane. Define the section orientation, and click Sketch. The Sketch tab opens.
3. Sketch the first section. If desired, click Sketch > Centerline to create a geometry centerline. Click OK. The Sketch tab closes.
Select a sketched datum curve.
5. If the sketched section does not contain a geometry centerline, click the collector or the Axis of revolution collector, and select a linear reference to use as the axis of revolution.
6. To create another section:
If the first section is an internal or external sketch, the rest of the sections in the blend must be internal sketches.
All the sections must lie in planes that intersect at the same axis.
a. Click the Sections tab, and click Insert.
b. To define the sketch plane for the section, perform one of the following actions:
To offset from another section in the blend:
1. Select , or select Offset dimension on the Sections tab.
2. Select the section from which to offset the new section in the list on the Blend tab or in the Offset from list on the Sections tab.
3. Type an angular offset value between -120° and 120° next to the selected section.
To select a reference to define the sketch plane:
1. Select on the Blend tab, or select Reference on the Sections tab.
2. Select a planar reference, a point, a vertex, or the end of a curve.
c. Click Sketch and create the section. Click OK to close the Sketch tab.
7. If required, sketch more sections by repeating the previous step.
8. To remove material along the blend to create a cut, click . Click to remove material from the other side of the sketch.
9. To add thickness to the section, click , and type a thickness value. Click to toggle the thicken direction to one side, the other side, or both sides of the sketch.
10. Click the Options tab and select the method for connecting the sections:
Straight—Connects the blend sections with straight lines and connects the edges of the sections with ruled surfaces, or
Smooth—Creates smooth lines and connects the edges of the sections with spline surfaces.
When you sketch the sections for a smooth rotational blend, all the section geometry must be sketched on the same side of the axis of revolution.
11. To create a closed solid shape in which the first section of the blend is also the last section, click the Options tab, and select the Connect end and start sections check box.
12. Click the Tangency tab, and select a tangency condition for each start and end section.
13. Click .