# Chapter 13 - PowerPoint PPT Presentation

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Chapter 13. Orthographic Sketching. Describing an Angle Bracket. Orthographic Projection. Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner. Orthographic Views.

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Chapter 13

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## Chapter 13

Orthographic Sketching

### Orthographic Projection

• Orthographic drawings represent three dimensional objects in three separate views arranged in a standard manner.

### Orthographic Views

• You can adequately describe most objects with three orthographic views.

• Front

• Top

• Right

### Line Types

Visible Line

Hidden Line

Center Line

Dimension Line

Construction Line

### Engineering Drawing Skills

• Lettering

• Line Types

• Orthographic Views

• Patience

See the example drawings in the notes.

### Engineering Drawing Rules

• Always use a Pencil.

• Make all lettering the same size.

• Use Engineering or Drafting Paper.

### Orthographic Views

• You can adequately describe most objects with three orthographic views.

• Front

• Top

• Right

### Sketching techniques

• Use very light construction lines

• “Box in” the rough outline of the object

• Darken only the lines you wish to keep

• Clean up the edges and rough spots

### Orthographic Projection

• 2 Dimensional projections on Orthogonal planes

• Show lines based on change of plane or change of material

• Use multiple linetypes

• Visible

• Hidden

• Center

### Describing an Angle Bracket

• A relatively simple object

• Pictorial view may be difficult

### Glass Box concept

• Envision the object surrounded in a glass box

• Project the views out onto the pieces of glass

• Each pane shows a 2D projection of the object

### Projection Planes

• The three panes of glass represent the principal orthographic planes

• Horizontal

• Frontal

• Profile

• Each plane illustrates two of the principal dimensions: Height, Width, and Depth

### Class Exercise

• As a team you have 3 minutes to discuss the following:

• What dimensions are contained on each of the principal projection planes?

### View Selection

• If the object has an obvious top, then it must be the top view

• Minimize the number of hidden lines

• Use the most descriptive view as the front view

• Conserve space by choosing the depth to be the smallest dimension

### Construction of Views

• Must align orthographic views

• Width appears in Top and Front

• Height appears in Front and Side

• Depth appears in Side and Top

• Height and width project directly

• Depth must be projected via a 45° angle

### Step 1 - Lightly Block Three Views

Use very light lines for drawing in the construction lines

### Think-Pair-Share

• In the next 1 minute as an Individual

• if you could ask a question . . . specifically what don’t you understand about today’s topic what would it be. [at least 3 items should be listed]

• Now take 2 minutes

• to merge your list with the person sitting next to you AND add 1 new item to the list

• In the next 5 minutes

• share the results with the other half of your team, delete questions that you can answer for each other, AND prioritize the remaining questions your list

### Team Exercise

• Complete three orthographic views of the object shown on the next slide.

• Include visible, hidden, and center lines where appropriate.