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The lathe shaft was inspected and compared with the technical drawing. According to the design, the required length is 50 ± 0.25 mm, meaning it should be between 49.75 mm and 50.25 mm. The measured length is 50.40 mm, which is out of the tolerance limit. The required diameter is 6 ± 0.004 mm, but the actual measurement is 6.015 mm, also outside the acceptable range. The hole depth is specified as 10 ± 0.25 mm, and the measured value is 10.12 mm, which is within the acceptable tolerance. Although the hole depth is correct, both the length and diameter are out of tolerance. Because the shaft does not meet two design requirements, it cannot be accepted and must be rejected.

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Based on the provided chart, engineering materials can be classified into two types metals and non-metals.

Metals are further divided into ferrous metals and non-ferrous metals. Ferrous metals contain iron and include cast iron and steel, which are strong and widely used in construction and manufacturing. Non-ferrous metals, such as copper, aluminum, and bronze, do not contain iron and are known for their resistance to corrosion and lightweight properties.

Non-metals include ceramics and plastics. Ceramics such as glass, porcelain, are hard, brittle, and heat-resistant, making them useful in high-temperature applications. Plastics have two main types. They are thermoplastics which can be reshaped when heated and thermosets which retain their shape permanently after heating.

Composite materials are made by combining two or more different materials to create a new material with enhanced properties. Some common examples of composite materials include fiberglass, which is made of glass fibers in a plastic matrix and used in boats and cars and concrete, a mixture of cement, sand, and gravel used in construction.

This classification helps engineers choose the right materials for different applications.

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From: Ngochuan@gmail.com

To: Haiduong@gmail.com

Subject: Study at university.

Hi there Duong,

How are you doing? I hope you’re doing well.

I wanted to share about my university life with you. I’m a second -year student at Hanoi University of Industry now, majoring in Mechatronic Engineering. I've learned many skills in my university, such as problem-solving, time management, and teamwork. My university offers great opportunities, like internships, and career development. However, managing deadlines and balancing studies with personal life can be difficult. I deal with these challenges by staying organized and looking for help from professors and friends when needed.

What I enjoy most is the chance to meet new people and explore new ideas. Again, I hope all is well with you. I’d love to hear about your experiences too!

Much love,

Duong

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Subject: Update on Current Design Process

Dear Duong,

I’m writing to update you on the current process of the new design project. Currently, we’ve successfully completed the preliminary designs and sketches, which gave us a clear foundation for the next steps.

At the moment, we are working on the feasibility study, which will be our focus for the rest of this week. This progress is important to ensure the design meets all technical and practical requirements.

Looking ahead, we still need to develop the detailed designs. These must be completed by the end of the month in time for our scheduled to meet with the client.

Please let me know if you have any questions or require additional information.

Best regards,
Huan

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My robot is called RobotHelper H1. It has the shape of like human with a smooth metallic body, standing about 1.4 meters high and weighing 17 kilograms. The robot is equipped with several key components: a touchscreen display, a camera, ultrasonic sensors, servo motors, and a rechargeable battery. The touchscreen allows users to interact with the robot easily, while the camera and sensors help it detect obstacles and recognize faces. The servo motors control its arms and wheels for movement. RobotHelper H1 can speak, follow commands, navigate positions, and assist with simple tasks like delivering items. It is ideal for homes, offices, or healthcare settings. The total cost to build RobotHelper H1 is approximately $1000. It’s smart, helpful, and user-friendly.

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Last month, I had a problem with the mill machine at the factory where I work. It suddenly stopped in the middle of a job while I was shaping a metal part. The issue happened during the night shift, and I was alone in that section. I noticed a strange noise before it stopped, so I turned off the machine immediately and checked it carefully. I discovered that a belt inside the motor had come loose. The reason was regular wear and lack of maintenance. I reported it to the supervisor and helped the technician replace the belt. After the machine was fixed, I felt satisfied and more confident in handling technical problems. It was a great learning experience.

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My ideal job in the future is to become a design engineer. In this role, I will be responsible for creating new machines and improving existing products to meet customer needs. To work as a design engineer, I will need a bachelors degree in mechanical engineering and strong skills in design software such as AutoCAD and SolidWorks. Good problem-solving ability, creativity, and attention to detail are important qualities for this job. I also need strong communication skills to work well in a team. I expect to have flexible working hours, a competitive salary, and bonuses based on my performance. I hope my job will give me opportunities for professional growth and allow me to work on exciting new technologies.