Outline of mechanical design
C. L. LIU 2006.6.9
1. Text book: Robert L. Mott, Machine Elements in Mechanical Design, international 4th edition, Pearson Education International 2004
2. Credit: 3 compulsory
3. Schedule and weighting of the course
(a) Week 1-4: Principles of design and stress analysis, Chapter 1-6 (260 p)
Week 5: Midterm examination (I), open book, 5 hrs, 20%
(b) Week 6-11: Design of mechanical drive, Chapter 7-14 (400 p)
Week 12: Midterm examination (II), open book, 5 hrs, 30%
(c) Week 13, 15: Design details and other machine elements, Chapter 16-23 and appendices (260 p)
Week 18: Final examination, open book, 3 hrs, 20%
(d) Design competition project: 30%
Week 14: design draft handed in and oral presentation, 5%
Week 16: manufactured parts and pre-test presentation, 5%
Week 17: Project final competition, 15%
Week 19: Project final report handed in, 5%

4. Design competition project:

(a) A small windmill with rotating diameter 600mm and rotating axis 1000mm elevated from ground surface is required to be designed and manufactured by 3- student team.
(b) Blades, hub, and frame should be disassembled in separate parts.
(c) The test site provides 3 pieces of M12x30L bolt and nut equally spaced in a 400mm pitch circle that can fix the windmill frame securely.
(d) A 148 Dia x 15L steel flywheel with a 12.5 Dia. central hole weighs 2kg will be fixed at the shaft tail of the windmill by a nut for test run.
(e) The shaft tail will provide: 12 Dia x 35L with shoulder; M12 x1.75p x 25L.
(f) The competition will be marked in four items with equal weighting factor:
Light weighted
Styling
Revolutions in one minute free from flywheel
Revolutions in one minute with flywheel
(g) Each team will be marked in a ranking number for each competition item.
(h) The least total of the ranking numbers of the four items is the best team and vise versa.
(i) An electrically powered fan of 300W and 600 mm rotating diameter blows horizontally. The height of the flow axis is 1000mm above ground. The windmill will be placed 1500mm apart from the electric fan.
(j) All materials and standard parts can be used. But a well-made product or semi-finished product can not be used such as a fan blade or transmission assembly.