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  Design & Tech CAD 

Level 1

Modelling 

Introduction

to 3D

CAD

modelling 

Design

Intent 

Sketching 

Intro to

Creo

through

the

Extrude

feature 

Editing the

Model 

Managing

the Model 

Robust

Modelling 

Revolve 

Blend 

Sweep 

Swept

Blend 

Engineering

Features 

Edit

Features 

Swept blend utilising reference geometry 

The Swept Blend creates a feature which is defined by two or more cross sections positionealong a trajectory - the resulting form is influenced by the sections and the trajectory. 

In the example below, the edge of the model is used as the trajectory and three different sections aplaced along the trajectory. 

In the above example the dimensions of the 'L' shaped lip change as it sweeps around the top edgethe base feature - these dimensions are controlled by the 3 sections positioned around the edge. 

Common Considerations:

  As with a blend, each cross section must have the same number of vertices (points), or inother words, be made up of the same number of lines. This defines how one section isconnected to another. 

  Try and plan the feature so that the section are not swept around the inside of any curves the trajectory - problems can occur if the section has to be ‘compressed’ inside a tight curv

  The cross sections and the trajectory can be sketched or  selected from existing edges or

reference geometry. 

Pick the Swept Blend icon from the right toolbar. The system defaults 

External Sketches 

Creating your trajectory and sections as separate features is a more efficient strategy as you will nolose your construction geometry if the features is deleted 

Trajectory 

Select a sketch or solid edges to define the trajectory. If your trajectory is made up of multiple edgelements then you will have to create a 'chain' of edges. DO NOT use CRTL to pick multiple edge

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Reference

Geometry 

Helical

Sweep 

Level 2

Modelling 

Level 3Modelling 

Assemblies 

EngineeringDrawings 

CNCMachining 

Simulation 

Rendering 

Others 

as this will select multiple trajectories. 

To create a chain of edges: 

  Select the first edge   Press and hold SHIFT   Pick the first selected edge again - this changes the selection method to chain   Still holding SHIFT, select the other edges which make up the chain 

Sections 

Under the section options change to Selected Sections. Pick your first sketch, then pick Insert toadd to the list and then pick the next sketch along the trajectory. Continue to pick Insert and selec

the relevant sketch for all your sections. 

If the previewed solid is twisted because the start points are not aligned, simply drag the start pointmarker to the appropriate vertex. 

Tangent end conditions 

If the feature is joined to a suitable geometry you can use the end condition markers to set tangenc

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In the below example some simple control surfaces were created prior to the sweptblend feature toenable setting tangency. 

Loughborough Design School. © Sean Kerslake 2011

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