TECH 104 – Technical Graphics Communication Week 2: Sketching, Text, and Visualization

TECH 104 – Technical Graphics Communication

Week 2:

Sketching, Text, and Visualization

Technical Sketch:


Week 2: Sketching, Text, and Visualization

Pictorial Sketch

Examples of Sketches:



Examples of Sketches:

Multiview Sketch

Sketching used Throughout Design Process:



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

(ISOmetric, Dimetric & TRImetric)(Orthographic)



Sketching Grids:

A. Orthographic grid

B. Isometric grid

C. Perspective grid



Perspective:

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



Parallel:

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”.

Multiview Drawings:Only two of the three dimensions(Height, Width & Depth)can be seen in a single view

Most Descriptive View:

Visualizing a Multiview Drawing:

Six Principle Views:



Extracting “Orthographic” Views of an Object:

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.



Orthographic:

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.



Understanding what Center Lines do…

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!



The “Alphabet of Lines”…

Lines have both style and precedence.

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

Multiviews of Common Objects:



Question!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.



Types of Lettering:

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



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. Darken all arcs and circles first.

4. Then darken straight lines.



#7Practice Problem:



#18

Practice Problem:



#45 Practice Problem:


Week 2:

Sketching Assignments



#17



#22



#30



#35



Week 3:

Multiview Drawings

(In-depth!)

Documents

TECH 104 – Technical Graphics Communication Week 2: Sketching, Text, and Visualization