The term "Machine elements", literally, refers to the elements responsible for the functions required in the machine as well
as configure the machine. The machine elements have diverse functions to play such as fixation, supporting, guiding, transmission,
control, seal, and lubrication. These functions should have in common a variety of products. For this reason, the mechanical
element has been developed as a component that can be used in common when performing the mechanical design, and is still evolving
now.
Understanding the machine element is an element of machine design, because a mechanical designer must understand the basic structure and operating principle of the machine elements and must select a suitable element. On the other hand, to learn about the history, type, production process, design method and selection method and evaluation method of machine elements themselves are also useful in the design of a variety of industrial products as well as machinery.
In other words, understanding of the mechanical elements, not end to the understanding of the machine parts, it leads to increase the ability of understanding and designing a machine.
This class will focus on various mechanical elements and their actual use. To learn what are and how to use such machine elements systematically will be the basis of mechanical design. It also becomes the basis for understanding the novel machine elements and machines. In addition, long history and diversity of the four machine elements will help understand the product design in a broad sense.
Understanding the machine element is an element of machine design, because a mechanical designer must understand the basic structure and operating principle of the machine elements and must select a suitable element. On the other hand, to learn about the history, type, production process, design method and selection method and evaluation method of machine elements themselves are also useful in the design of a variety of industrial products as well as machinery.
In other words, understanding of the mechanical elements, not end to the understanding of the machine parts, it leads to increase the ability of understanding and designing a machine.
This class will focus on various mechanical elements and their actual use. To learn what are and how to use such machine elements systematically will be the basis of mechanical design. It also becomes the basis for understanding the novel machine elements and machines. In addition, long history and diversity of the four machine elements will help understand the product design in a broad sense.
This course deals with the history, types, usage and installation method and applications of machine elements to help students
obtain a broad understanding of them that helps general product design.
It also covers with mechanical principles, strengths and safety of such four kinds of machine elements to help students obtain a deep understanding of them that helps basic machine design.
It also covers with mechanical principles, strengths and safety of such four kinds of machine elements to help students obtain a deep understanding of them that helps basic machine design.
- Students should be able to describe the relationship of the mechanical elements, machinery, and mechanical design.
- Students should be able to explain the history, applications, and how to use machine elements.
- Students should be able to select a machine element and to assess whether the chosen machine elements meet the required specifications.
| Class schedule | HW assignments (Including preparation and review of the class.) | Amount of Time Required | |
|---|---|---|---|
| 1. | Introduction to machines, machine elements, and machine design. ○Syllabus overview ○Definition and significance of machine elements ○Design processes Some prerequisites of mechanical design ○Precision and tolerance ○Materials for machines ○Exact constraints design |
Textbook Section 1.1~1.4 | 190minutes |
| 2. | Some prerequisites of mechanical design ○Precision and tolerance ○Materials for machines ○Exact constraints design |
Textbook Section 1.5, 2.4 ~ 2.7 | 190minutes |
| 3. | Screws ○Types of screws and threads. ○Mechanics of screws ○Design of bolted joints |
Textbook Chapter 3 | 190minutes |
| 4. | Shafts ○Types of shafts (axles, spindles). ○Determination of shaft diameter based on strength and stiffness. ○Critical speeds ○Types and selection of couplings |
Textbook Chapter 4 | 190minutes |
| 5. | Bearings ○Definition and characteristics of bearings ○Ball bearing lifetime calculation ○Plain bearings/self-lubricating bearings |
Textbook Chapter 4 | 190minutes |
| 6. | Linear guides ○Types of linear guides ○Calculation of lifetime ○Applications Design of 1-axis table (1): Basic design ○Basics in Cartesian robot and linear actuators ○Specifications and lifetime ○Selection of ball linear guides |
Textbook Section 5.5 Textbook Section 9.1 ~ 9.2 |
190minutes |
| 7. | Ball screws ○Types of ball screws ○Efficiency and Preloading ○Speed and load limits Design of 1-axis table (2): Selection of ball screws ○Specifications, precision ○Speed limit ○Axial load limit |
Textbook Section 6.4 Textbook Section 9.3 ~ 9.5 |
190minutes |
| 8. | Mid-term exam | Review the contents learned by now. | 130minutes |
| 60minutes | |||
| 9. | Gears ○Definitions of gears/teeth dimensions ○Contact ratio ○Strength of gear teeth ○Backlash and profile shift |
Textbook Chapter 5 | 190minutes |
| 10. | Gear mechanisms ○"Glue" method to determine reduce ratio ○Differential gears ○Planetary gears ○Harmonic drive |
Textbook Section 6.2.13 | 190minutes |
| 11. | Transmissions ○Various wrapping transmissions ○Design of toothed belt transmission Design of robot arms ○Basics in robot arms ○Concept and basic design ○Selection of toothed belts |
Textbook Section 6,2 ~ 6.3 | 190minutes |
| 12. | Actuators ○Types of actuators ○Structures and characteristics of a DC motor. ○AC motors (Induction & PM) ○Stepper motors Design of gear reducer (1): Selection of a motor and reducing ratio ○Modeling of a gear reducer ○Computation of motor torque and reducing ratio ○Determination of teeth numbers |
Textbook Chapter 8 | 190minutes |
| 13. | Design of 1-axis table (3): Selection of Actuators ○Estimation of moment of inertia ○Selection of coupling ○Evaluation of torque ○Selection of motor |
Textbook Section 9.6 | 190minutes |
| 14. | Term-end exam | Review the contents learned by now. | 300minutes |
| Total. | - | - | 2770minutes |
| Mid-term Exam | Final Exam | Total. | |
|---|---|---|---|
| 1. | 10% | 10% | 20% |
| 2. | 10% | 20% | 30% |
| 3. | 20% | 30% | 50% |
| Total. | 40% | 60% | - |
The final grade will be calculated according to short-term exam (40%) and term-end exam (60%).
This course will give a pass mark (60 points) to students who have successfully found methods for engineering calculation from the textbook and literature and have provided appropriate design values with appropriate bases.
This course will give a pass mark (60 points) to students who have successfully found methods for engineering calculation from the textbook and literature and have provided appropriate design values with appropriate bases.
- There will be a time open for discussion after each class (10 ~ 20 min).
- Course that cultivates a basic problem-solving skills
| Work experience | Work experience and relevance to the course content if applicatable |
|---|---|
| Applicatable | Experience in development of lab apparatus, and product development in a startup company. |
- 8.DECENT WORK AND ECONOMIC GROWTH
- 9.INDUSTRY, INNOVATION AND INFRASTRUCTURE
Last modified : Sat Jun 20 04:17:54 JST 2020