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Chapter 2 Sketching, Constraining & Dimensioning. Chapter 2 - Objectives. After completing this chapter, you will be able to do the following: Change the sketch and part options Sketch an outline of a part Create geometric constraints Use construction geometry to help constrain sketches

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Chapter 2 sketching constraining dimensioning l.jpg
Chapter 2Sketching, Constraining & Dimensioning


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Chapter 2 - Objectives

  • After completing this chapter, you will be able to do the following:

    • Change the sketch and part options

    • Sketch an outline of a part

    • Create geometric constraints

    • Use construction geometry to help constrain sketches

    • Dimension a sketch

    • Create dimensions using the automatic dimensioning tool

    • Change a dimension’s value in a sketch

    • Import AutoCAD DWG data


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Sketch & Part - Application Options

  • Options

    • Customized your preferences

    • Settings are global

    • Affects all open & new Inventor documents


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Sketch - Application Options

  • Constraint Placement Priority

  • Display

  • Overconstrained Dimensions

  • Snap to Grid

  • Edit dimensions when created

  • Autoproject edges during curve creation

  • Autoproject edges for sketch creation and edit

  • Autoproject part origin on sketch create

  • 3D Sketch


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Part - Application Options

  • Sketch on New Part Creation

  • Construction

  • Auto-hide in-line work features

  • Auto-hide in-line work features

  • Auto-consume Work Features and Surface features


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Part - Application Options

  • 3D Grip Dimensional Constraint Relocation

  • 3D Grip Geometric Constraint Relocation


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Units

  • Units

    • Default unit of measurement

    • Part, Assembly & Drawing files

    • Template file

    • Changing - Overridden

    • Edit dimension


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Templates

  • Templates

    • New files created from a template

    • Add or Modify templates

    • Template directory

    • Subdirectory

      • New Tab


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Creating a Part

  • From the Open dialog box click the Standard.ipt icon in the Open dialog box

  • From the New file drop list on the Standard toolbar


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Creating a Part

  • Sketches & Default Planes

    • Sketch plane

      • 2D objects are sketched

      • Active sketch

      • Three planes

        • XY,YZ, and XZ

      • Three Axes

        • X, Y, and Z

      • Center

        • Origin - point at the intersection

      • Browser

  • New Sketch

    • Active sketch


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Sketch the Outline of the Part

  • Step 1 - Sketches Overview

    • Sketching strategies, tools, & techniques

      • Outline

      • Draw to finished size/shape

      • Visual Guide – distance & angle

      • No overlaps & gaps

      • Keep shape simple

      • Closed vs. Open shape

    • Sketch Tools

      • Sketching tools

      • Expert mode on/off


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Sketch the Outline of the Part

  • Using the Sketch Tools

    • Visual feedback

  • Line Tool

    • Powerful tool

    • Endpoint - Arc

  • Inferred Points

    • Dashed lines

    • Endpoints

      • horizontal

      • vertical

      • perpendicular


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Sketch the Outline of the Part

  • Automatic Constraints

    • Constraint symbols

  • Scrubbing

    • different constraint applied

    • move the cursor so it touches

  • Selecting Objects

    • individually objects

    • multiple objects

    • color change

  • Deleting Objects

    • right-click


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Measure Tools

  • Measure

    • Distances

      • Points

      • Edges

      • Faces

      • Parts

    • Angles

    • Loops

    • Area

    • Region Properties


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Analysis Tools

  • Measure

    • Additional Options

      • Click the arrow in the Measure dialog box


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Exercise 2-1

  • Creating A Sketch with Lines

Exercise 2-2

  • Creating a Sketch with Tangencies


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Constraining the Sketch

  • Step 2 - Geometric Constraints

    • Apply behavior

    • Create relationships

      • Status Bar

      • Fully constrain

      • Fix constrain

    • Constraint Types

      • 11 geometric constraints


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Constraining the Sketch

  • Geometric Constraints

    • Adding Constraints

      • Applying

      • Over-constrain

    • Constraint Visibility


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Constraining the Sketch

  • Geometric Constraints

    • Dragging a Sketch

      • Constrained or Not

      • Geometry stretches

    • Showing Constraints

      • Show all & Hide all F8 and F9

      • To see applied constraints

      • Objects change color

    • Deleting Constraints

      • Right-click or Delete key


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Construction Geometry

  • Standard toolbar

  • Add dimensions and constraints

  • Not visible when a feature is created

  • Always available in the sketch


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Exercise 2-3

  • Adding and Displaying Constraints


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Adding Dimensions

  • Step 3 – Adding Dimensions

    • All dimensions created are parametric

    • Control & change size of geometry

    • General Dimensioning

      • Create linear, angle, radial, or diameter

      • Automatically snap

      • Extension lines

      • Preview image

    • Dimensioning Lines

      • Endpoints - two

      • Length

    • Dimensioning an Angle

      • Two lines


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Adding Dimensions

  • Dimensioning Arcs and Circles

    • Circumference

    • Arc = radius

    • Circle = diameter

  • Diametric Dimensions

    • Revolved part

    • Represent a quarter outline

    • Linear diameter

    • Axis of rotation

  • Dimensioning to a Tangency

    • Arc or circle

    • Constraint symbol changes

    • Two quadrants


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Adding Dimensions

  • Entering and Editing a Dimension’s Value

    • Automatically appear

    • Change the value

    • Edit Dimension option

    • Default value

    • To change double-click

    • Enter exact value

    • Accurate to six decimal places

    • Smallest dimensions first


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Adding Dimensions

  • Entering and Editing a Dimension’s Value

    • Repositioning a Dimension

      • New location

      • Origin points cannot be moved

    • Over-Constrained Sketches

      • Inventor will not allow

        • over-constrain

        • duplicate constraints

        • conflict with another constraint

    • Driven dimension

      • Reference dimension

      • Parentheses

      • Over-constrained dimensions option


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Adding Dimensions

  • Auto Dimension

    • Automatically apply

      • Dimensions

      • Constraints

    • State number of dimensions or constraints required to fully constrain the sketch

    • First apply critical constraints and dimensions

    • Will not override or replace existing constraints or dimensions


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Exercise 2-4

  • Dimensioning A Sketch


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Opening/Importing AutoCAD Files

  • Copy to clipboard within AutoCAD and Paste in Inventor

  • Open/Import AutoCAD & AutoCAD Mechanical Files

    • New Drawing

    • New Part

    • Title Block

    • Border

    • Symbol

    • 2D and 3D

  • Import 2D geometry to an active sketch (part or drawing)


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Move and Scale Tools

  • Move

    • Move the objects to another location

  • Scale

    • Scale sketch


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Importing Other File Types

  • SAT

  • STEP

  • PRO/E up to Version 20

  • DXF

  • IGES

    • Construction Environment

    • Toolset


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Exercise 2-5

  • Inserting an AutoCAD File


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Applying Your Skills

  • Skill Exercise 2-1

  • Skill Exercise 2-2


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