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Creating Blends by Selecting Parallel Sections

You can create a blend feature by selecting existing sketches or sections or chains or loops, of a model’s existing feature edges.
• A blend feature must contain two or more sections.
• Selected sections are connected using a smooth curve.
• Sections are blended based on selection order.
• You can reorder or remove sections.

Creating Blends by Selecting Parallel Sections 2
Figure 2 – Blending Three Selected Sections

Creating Blends by Selecting Parallel Sections 1
Figure 1 – Blend Feature

Creating Blends by Selecting Parallel Sections 3
Figure 3 – Blend with Twisting Due
Creating Blends by Selecting Parallel Sections to Misaligned Start Points
You create blend features when you need to create models that contain different transitional cross-sections. For example, a blend feature enables you to create geometry that starts as a circular cross-section, but then changes to a square cross-section as you transition along the length of the feature. Blend features can add or remove material.
Selecting the Sections
A blend feature must contain two or more sections. You can select existing sketches or sections, or chains or loops of a model’s existing feature edges.
The sections you select may be non-parallel, although this functionality is not discussed in this topic. By default, the system connects the selected sections together using a smooth curve.
Each section must contain the same number of entities (or vertices). There are two exceptions to this rule:
• The blend can start or end as a single point.
• You can add a number of blend vertex points, each of which counts as an entity. For example, a blend vertex placed on a triangular section enables the system to blend to a square. The system essentially connects the points of each section to create the blend feature.
Section Start Points
Each section has its own start point. The start points should correspond between sections to avoid a twisting effect in the resulting blend feature. You can individually drag the start point for each section to a different vertex in that section. In Figure 3, the start point for Section 2 is in a different location, resulting in the twisting effect. In Figures 1 and 2, the start points are properly aligned.
The start point arrow direction can be flipped, but this does not affect blending.
Manipulating Selected Sections
Consider the following regarding manipulating selected blend sections:
• By default, sections are blended together in the order of selection.
However, you can always move sections up or down in the blend order.
• You can remove sections.
• The offset, or depth, between sections is based on the selected section’s depth with respect to the other selected sections. You cannot specify a
different depth.
• When defining a blend feature, only one section is considered the active section at any time. To set a given section as the active section, you can either select it from the Sections tab in the dashboard, or you can select the section leader note in the graphics window. The selected section then changes color, and all right-click options pertain to this active section. In Figures 2 and 3, Section 2 is the active section


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