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TECH 104 – Technical Graphics Communication. Week 2: Sketching, Text, and Visualization. Here’s what we talked about last time: Lines may be defined as……. TECH 104 – Technical Graphics Communication. A series of points in space organized in a rational order

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tech 104 technical graphics communication

TECH 104 – Technical Graphics Communication

Week 2:

Sketching, Text, and Visualization

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Here’s what we talked about last time:

Lines may be defined as…….

TECH 104 – Technical Graphics Communication

  • A series of points in space organized in a rational order
  • 2. The shortest distance between two points
  • 3. The geometry created by the intersection of two planes or surfaces
  • 4. A set of points organized that have length and direction, but no thickness

Week 2: Sketching, Text, and Visualization

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The “Alphabet of Lines”…

TECH 104 – Technical Graphics Communication

Lines have both style and precedence.

Object (visible) lines are the MOST important…then hidden lines…then center lines…etc.

Week 2: Sketching, Text, and Visualization

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Examples of line use and layout:

TECH 104 – Technical Graphics Communication

Note:

The center line has many variations.

It’s job is to show the theoretically perfect center of arcs, holes, circles, and cylinders.

Week 2: Sketching, Text, and Visualization

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TECH 104 – Technical Graphics Communication

Examples of Sketches:

Week 2: Sketching, Text, and Visualization

Multiview Sketch

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Examples of Sketches:

TECH 104 – Technical Graphics Communication

Pictorial Sketch

Week 2: Sketching, Text, and Visualization

NOTE: There are also “technical sketches” used in industry which may include notes, and several versions that show motion.

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Sketching Grids:

TECH 104 – Technical Graphics Communication

  • Orthographic grid
  • Isometric grid
  • C. Perspective grid

Week 2: Sketching, Text, and Visualization

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Sketches use “proportion”, not scale!

TECH 104 – Technical Graphics Communication

Proportion allows the designer to use approximate values to create a balanced looking object.

Sketches are…accurate freehand drawings which use single lines to represent edges and features.

Multi-line sketching is NOT used in engineering design. (Scribbling!)

Week 2: Sketching, Text, and Visualization

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Classification of Sketches:

TECH 104 – Technical Graphics Communication

Each classification of sketch has a particular purpose from production use…to technical illustration.

Week 2: Sketching, Text, and Visualization

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Question!

TECH 104 – Technical Graphics Communication

How do you know when a sketch or CAD drawing is complete?

ANSWER: When the production people can make the part without having to ask you any questions!

Most drawings not only have views of the object, but also I include written notes and dimensions to aid in its production.

Week 2: Sketching, Text, and Visualization

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Types of Lettering:

TECH 104 – Technical Graphics Communication

Simple gothic is used for engineering design. Notice that it is “san serif” (no hats or shoes!)

Week 2: Sketching, Text, and Visualization

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Types of Lettering:

TECH 104 – Technical Graphics Communication

Inclined Gothic is often used for architectural drawings, and various types of technical illustrations.

(All the lettering used in these presentations is inclined gothic.)

Week 2: Sketching, Text, and Visualization

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Projection types:

TECH 104 – Technical Graphics Communication

Drawings use various types of projection (how we view the object), to enhance our ability to visualize what we are being asked to see or understand.

Let’s look at the various styles of projection used…

Week 2: Sketching, Text, and Visualization

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Projection types:

TECH 104 – Technical Graphics Communication

Week 2: Sketching, Text, and Visualization

Here’s how the same object may look using different projection styles.

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Projection types:

TECH 104 – Technical Graphics Communication

Projection type is defined by the “line of sight” from the observer.

Let’s look at some of these…..

Week 2: Sketching, Text, and Visualization

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Perspective:

TECH 104 – Technical Graphics Communication

Week 2: Sketching, Text, and Visualization

The line of sight is cone-shaped - which makes objects far away appear smaller to our view. Objects are not “true shape and size”.

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Parallel:

TECH 104 – Technical Graphics Communication

Week 2: Sketching, Text, and Visualization

The line of sight is always parallel regardless of how far away the object is from our view. This allows surfaces to be drawn “true shape and size”.

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Orthographic:

TECH 104 – Technical Graphics Communication

Ortho means “at 90 degrees”, and is a form of parallel projection.

Orthographic projections are used to show several views of the same object in one drawing set.

Week 2: Sketching, Text, and Visualization

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Orthographic:

TECH 104 – Technical Graphics Communication

The “principle views “ should be chosen to show the most detail of the object with the least number of hidden lines.

Here, the TOP, FRONT, and RIGHT SIDE were chosen.

Week 2: Sketching, Text, and Visualization

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Understanding what Center Lines do…

TECH 104 – Technical Graphics Communication

Center lines show the theoretical perfect center of arcs, holes, and cylinders. They can be used to show symmetry, or used to aid in dimensioning an object.

Center lines NEVER start or stop on another line!

Week 2: Sketching, Text, and Visualization

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Steps in creating a 3-view sketch…

TECH 104 – Technical Graphics Communication

Step 1:

Layout the 3 principle views you have chosen with even margins between views and the outside border of your drawing area.

Step 2:

Rough out the general shape of each view.

Week 2: Sketching, Text, and Visualization

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Steps in creating a 3-view sketch…

TECH 104 – Technical Graphics Communication

Step 3:

Transfer any data from one view to its neighbor using “reverse construction”. This can be done by using a “miter line”.

Step 4:

Add hidden and center lines to the necessary views.

Week 2: Sketching, Text, and Visualization

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Steps in creating a 3-view sketch…

TECH 104 – Technical Graphics Communication

Step 5:

Erase all unnecessary lines and “snap” the lines on your views.

“Snapping” adds weight to the lines in each view and makes the drawing easier to read.

Step 6:

Add notes and/or dimensions to complete your drawing.

Week 2: Sketching, Text, and Visualization

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TECH 104 – Technical Graphics Communication

Here’s some tips on creating a multi-view drawing:

1. Lightly sketch all the information that you know first.

2. Use reverse construction to locate lines that may be

unknown such as compound angles.

3. Add all circles and other arcs to your drawing.

4. Snap all arcs and circles first, and then straight lines.

Week 2: Sketching, Text, and Visualization

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TECH 104 – Technical Graphics Communication

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TECH 104 – Technical Graphics Communication

Week 3:

Multiview Drawings

(In-depth!)

Week 2: Sketching, Text, and Visualization

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