UNIT 8 - GEAR DESIGN DRAWINGS

I. OBJECTIVES - Upon the completion of this step, the student should be able to:

A. List and describe the appearance and use of the nine major kinds of "gears";
B. Calculate the velocity of a gear using the "pitch diameter";
C. Describe the three methods for calculating "gear ratios";
D. Define the basic terminology associated with "gears";
E. Find the "diametral pitch" of a "gear";
F. Find the "center-to-center distances" between two "gears";
G. Describe the information needed for representing and creating gear teeth;
H. List the basic methods for making gears;
I. List two sources of information for the "design of gears";

II. REFERENCES - The following list contains textbooks, reference books, pamphlets, audio-visuals, and hand-out sheets that will help you learn about this step:

A. Goetsch, Nelson, Chalk, pp. 535-549.
B. Jensen & Helsel, pp. 444-480.
C. Spence, pp. 470-482.
D. Giachino & Beukema, pp. 559-600.

III. ASSIGNMENTS - The following list of activities and problems will help you understand the objectives for this step and provide practical applications to help you acquire the skills needed to continue with the next step:

A. Access the "Tech Draw Server" to down load a copy of the Study Questions for Step 8. You may printout the Study Questions for Step 8 and write in the answers or you may save the file to complete using a computer.

B. Complete a Division Sheet for Step 8. Include the title of the step, step number, your name, and illustrate the basic and major terms used to describe a gear. See SAMPLE.

C. Prepare a"Detail Drawing" with"Cutting Data " for a gear that you have not worked on to date for your project. (Reference Prob. 16-1, p. 550 in textbook)

D. Prepare a"Detail Drawing" for a part that you have not worked on to date for your project. Include Change Block, ECR, and ERO for extra credit.

E. Prepare an additional"Detail Drawing" with"Cutting Data" for a gear or gear train that you have created for your project. (AC credit only)