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Chapter 2 Sketching, Constraining & DimensioningPowerPoint Presentation

Chapter 2 Sketching, Constraining & Dimensioning

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Chapter 2 Sketching, Constraining & Dimensioning. Chapter 2 - Objectives. After completing this chapter, you will be able to Change the sketch and part options as needed Sketch an outline of a part Create geometric constraints Dimension a sketch

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Chapter 2Sketching, Constraining & Dimensioning

Chapter 2 - Objectives

- After completing this chapter, you will be able to
- Change the sketch and part options as needed
- Sketch an outline of a part
- Create geometric constraints
- Dimension a sketch
- Create dimensions using the automatic dimensioning tool
- Change a dimension’s value in a sketch
- Import AutoCAD DWG data

Sketch & Part - Application Options

- Options
- Customized your preferences
- Settings are global
- Affects all open & new Inventor documents

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
- 3D Sketch

Part - Application Options

- Sketch on New Part Creation
- Parallel view on sketch creation
- Auto-hide in-line work features
- Construction

Units

- Units
- Default unit of measurement
- Part, Assembly & Drawing files
- Template file
- Changing - Overridden
- Edit dimension

Templates

- Templates
- New files created from a template
- Add or Modify templates
- Template directory
- Subdirectory
- New Tab

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

- Sketch plane
- New Sketch
- Active sketch

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 it simple
- Closed vs. Open shape

- Sketch Tools
- Sketching tools
- Expert mode on/off

- Sketching strategies, tools, & techniques

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

Sketch the Outline of the Part

- Automatic Constraints
- Constraint symbols

- Scrubbing
- different constraint applied
- move the cursor so it touches

- Precise Input
- specified length or angle

- Selecting Objects
- individually objects
- multiple objects
- color change

- Deleting Objects
- right-click

Measure Tools

- Analyze
- Sketch
- Part
- Assembly models

- Measure
- Distances
- Angles
- Loops
- Area

Analysis Tools

- Measure
- Additional Options
- Click the arrow in the Measure dialog box

- Additional Options

Constraining the Sketch

- Step 2 - Geometric Constraints
- Apply behavior
- Create relationships
- fully constrain
- fix constrain

- Constraint Types
- 11 geometric constraints

Constraining the Sketch

- Geometric Constraints
- Adding Constraints
- Applying
- Over-constrain
- Duplicate
“Adding this constraint will over-constrain the sketch”

- Snap
- Midpoint, center & intersection
- Coincident constraint

- Adding Constraints

Constraining the Sketch

- Geometric Constraints
- Dragging a Sketch
- Constrained or Not
- Geometry stretches

- Showing Constraints
- To see applied constraints
- Objects change color

- Deleting Constraints
- Right-click
- Show all & Hide all

- Dragging a Sketch

Exercise 2-3

- Adding and Displaying Constraints

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

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

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

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

- Inventor will not allow
- Driven dimension
- Reference dimension
- Parentheses
- Over-constrained dimensions option

- Repositioning a Dimension

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

- Automatically apply

Exercise 2-4

- Dimensioning A Sketch

Opening/Importing AutoCAD Files

- Opening/Importing AutoCAD Files 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)

Applying Your Skills

- Skill Exercise 2-1
- Skill Exercise 2-2

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