Parametric Modeling

3D Modeling Steps - Sketch Step 1 Sketch Geometry (use the “line” tool today) You are making a four-sided shape that is not necessarily a square at first. Next, you will use the “parallel” and “perpendicular” GEOMETRIC CONSTRAINT TOOLS to make it a rectangle.

Sketch Geometry Line Sketch Tool

3D Modeling Steps - Constrain Step 1 Sketch Geometry Step 2 Constrain Geometry A. Apply Geometric Constraints (try perpendicular and parallel)

Geometric Constraints Applied First Geometric Constraint Tools What do you think we do next?

3D Modeling Steps - Constrain Step 1 Sketch Geometry Step 2 Constrain Geometry A. Apply Geometric Constraints B. Apply Dimension Constraints

Dimension Constraints Applied Second Dimension Constraint Tool

The geometry that has been constrained is a profile of an object.

3D Modeling Steps - Extrude Step 1 Sketch Geometry Step 2 Constrain Geometry A. Apply Geometric Constraints B. Apply Dimension Constraints Step 3 Extrude the Object from the Profile A. Change View to Isometric (Home)

Profile Changed to Isometric Right mouse click, select Home View or use shortcut key F6 or Click on Home icon by View Cube

3D Modeling Steps - Extrude Step 1 Sketch Geometry Step 2 Constrain Geometry A. Apply Geometric Constraints B. Apply Dimension Constraints Step 3 Extrude the Object from the Profile A. Change View to Isometric (Home) B. Switch to Features Environment

Features Environment Select Finish Sketch to switch to Features Environment From this To this

3D Modeling Steps - Extrude Step 1 Sketch Geometry Step 2 Constrain Geometry A. Apply Geometric Constraints B. Apply Dimension Constraints Step 3 Extrude the Object from the Profile A. Change View to Isometric (Home) B. Switch to Features Environment C. Preview the Extrusion

Extrusion Parameters Set Extrusion Dialogue Box Select Extrude from Create panel

3D Modeling Steps - Extrude Step 1 Sketch Geometry Step 2 Constrain Geometry A. Apply Geometric Constraints B. Apply Dimension Constraints Step 3 Extrude the Object from the Profile A. Change View to Isometric (Home) B. Switch to Features Environment C. Preview the Extrusion D. Apply Extrusion

Profile Extruded Choose color here

Summary Step 1 Extrude Constrain Geometry Sketch Step 3 Step 2 Steps in Parametric Modeling

Part 2 Parametric Modeling

Adding a Feature to a Solid Model Step 1: As we have practiced, we can add a Sketch Plane to the surface on which some additional geometry will be sketched by clicking on that surface and choosing “new sketch”

Create New Sketch Plane Sketch plane selected with left mouse click Sketch Button

Steps for Adding a Feature Step 1:Add Sketch Plane Step 2:Sketch Geometry… We can use the line tool again to draw the desired shape.

View Face Sketch Geometry Normal View selected with View Face tool or by clicking on front of View Cube

Steps for Adding a Feature Step 1:Add Sketch Plane Step 2:Sketch Geometry Step 3:Constrain Geometry… We can dimension from any location on any object line (a POINT) to another location (different point) on another object line

Constrain Geometry

Steps for Adding a Feature Step 1:Add Sketch Plane Step 2:Sketch Geometry Step 3:Constrain Geometry Step 4:Create Feature

Feature Parameters Set Isometric (Home) view selected, Extrusion dialog box set Choose cut operation here

Feature Created

Summary Step 1 Create Sketch Plane Constrain Sketch Geometry Step 3 Step 2 Create Feature Step 4 Adding a Feature to a Solid Model

Let’s see it again … This time we will create a hole feature. We will use a POINT (or center point) as an anchor for the hole we will draw.

Rotate Model Dynamic Rotation View Cube Rotate model with Dynamic Rotation tool or View Cube

Step 1 Create New Sketch Plane

Step 2 Sketch Geometry This tool used to… …create center point geometry

Step 3 Constrain

Step 4 Create Hole Feature Hole Feature selected from Modify panel

Completed Hole Feature

Model with Hole Feature (skip this step?) Model in Isometric view with hidden edges displayed Hidden Edge Display

Summary Step 1 Create Sketch Plane Constrain Sketch Geometry Step 3 Step 2 Create Feature Step 4 Adding a Feature to a Solid Model

Why Parametric Modeling? Determine the shape and size of the geometry at any time during the design process. This part should be 5 in. long, not 3 in. How can we fix this without redrawing it?

Why Parametric Modeling? Benefits –Shape before size –Geometric and dimension constraints used to capture design intent –All files can be quickly updated –Existing data can be used for new designs –Quick design turn around

Show your teacher… Show your teacher your final model You may be asked to demonstrate something using Inventor Complete your conclusion questions Put your complete assignment in the correct place before you leave class and ask for permission to begin the SketchPlaneCube assignment