DRF 104 - Basic Mechanical Design

Credits: 4
Instructional Contact Hours: 8

Developed for students with no drafting experience, less than one year of high school mechanical drafting, or for students with less than a C (2.0) grade in mechanical drafting. Provides instruction and practice to develop skill in spatial visualization, sketching, multiview instrument drawing, section views, design concept presentation, pictorial drawing, and American National Standards Institute (ANSI) conventional drafting and dimensioning standards. Credit may be earned in DRF 104 or DRF 105 but not in both.

Prerequisite(s): None
Corequisite(s): None
Lecture Hours: 15 Lab Hours: 105
Meets MTA Requirement: None
Pass/NoCredit: Yes

Outcomes and Objectives 1. Clearly communicate graphically with sketches and drawings using traditional drafting tools.

A. Identify and demonstrate correct use of traditional sketching and drawing tools.

B. Use square and isometric grid paper to make one view, multiview, and pictorial sketches.

C. Identify and correctly draw conventional line symbols to make sketches and drawings.

D. Neatly place hand-made standard letters and numbers on sketches and drawings.

E. Make free- hand well proportioned sketches of simple machine part shapes to include circle, arc, and polygon plane figures, and
polyhedral solids.

2. Create, record, and communicate design ideas using American National Standards Institute (ANSI) practices.

A. Demonstrate correctly visualized real and imagined objects by making standard drawings and sketches.

B. Read, write, and correctly use the nomenclature of technical design graphics.

C. Correctly demonstrate orthographic projection theory and conventional ANSI practices by reading and making orthographic multiview,
isometric and oblique pictorial, and sectional view representations typical of engineered objects.

D. Execute course work accurately, legibly, neatly, and in a timely manner.

3. Delineate graphic representations of points, lines, and plane and solid shapes using the principles of graphic geometry.

A. Use prescribed geometric methods to:

1. Bisect lines, arcs, and angles,

2. Divide lines, areas, and volumes into equal and proportional parts,

3. Copy, enlarge, or reduce the size of geometric figures in any prescribed orientation,

4. Construct points, lines, polygons, planes, and curves, and

5. Construct lines, arcs, and circles with specified tangent conditions.

B. Use traditional drafting tools and standard methods to make accurate drawings to dimensional specifications. Examples include tools, jigs,
fixtures, injection molds, etc.

4. Read and describe with standard dimensioning practices the size of objects by using various fractional and decimal inch, and metric scales to place and specify conventional numeric dimensions and notes.

A. Correctly demonstrate the ANSI concepts of contour dimensioning and geometric

B. breakdown for giving size and location of various geometric shapes.

C. Identify the features and parts of dimension information.

D. Distinguish between size and location dimensions.

E. Create and read technical drawings at any specified scale.

F. Use ANSI standard practices to place text information to drawings.

5. Follow ANSI conventional practices and use traditional drafting tools to make multiview technical drawings.

A. Interpret, read, and draw any or all of the six standard orthographic views using conventional practices.

B. Correctly transfer height, width, and depth distances between views.

C. Display correct conventional representations of standard geometric features.

D. Identify and correctly display hidden, center, and visible lines in all views.

E. Draw and identify normal, inclined, and oblique lines and surfaces in all views.

F. Correctly draw positive and negative cylinders and cylinder deformations in all views.

G. Plan drawing views to fit properly within the sheet area at the intended scale.

6. Follow ANSI practices for manual drawing to make technical drawings with conventional sectional views.

A. Demonstrate understanding of cutting-plane theory by correctly placing the cutting-plane line within technical

B. drawings.

C. List the names and identify the seven standard types of section views.

D. Demonstrate understanding of standard practices for conventional features.

E. Consistently draw correctly sectioned views when provided two orthographic views.

F. Demonstrate correct hidden line practices for sectioned views.

G. Correctly represent and place conventional break symbols, section-lining, and view identification where necessary.

7. Make pictorial representations of objects using axonometric and oblique drawing methods.

A. Recognize the difference between orthographic projection, isometric drawing, perspective drawing, and oblique drawing.

B. Make sketches on grid paper of objects with normal, inclined, oblique, cylindrical, and

deformations of cylinders when provided two orthographic views.

C. Consistently measure only along the isometric or oblique axes.

D. List the advantages and limitations of orthographic multiview, isometric, and oblique representations of objects.

E. Make isometric and oblique drawings with normal, inclined, oblique, cylindrical, deformations of cylinders, and irregular curves when
provided two orthographic views.