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The chosen machine tool for our discussion is the CNC milling machine. This advanced equipment is designed to perform precise and automated cutting, drilling, and shaping of materials such as metal, plastic, or wood. Its features include a computer numerical control system that enables it to execute complex designs with high accuracy and consistency.To ensure optimal performance and longevity of the CNC milling machine, there are several maintenance tasks that should be conducted on a regular schedule. These include routine inspections of components like the spindle, cutting tools, and coolant system, which should be done daily or before every operation. Additionally, lubrication and cleaning of critical parts should be carried out weekly, while more comprehensive maintenance, such as recalibrating the machine and replacing worn-out components, may be necessary monthly or quarterly based on usage.Regular maintenance is essential for the CNC milling machine to function at its best and deliver consistent high-quality results. By conducting these maintenance tasks, we can prevent unexpected breakdowns, reduce costly repairs, and extend the machine's lifespan, ultimately improving productivity and minimizing downtime. Proper maintenance also ensures that the machine operates safely and efficiently, reducing the risk of accidents or errors during operation. (196 words)

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I WILL WRITE ABOUT THE PLASTIC MOLDING PROCESS. PLASTIC MOLDING IS THE MOST COMMONLY USED PRODUCTION PROCESS FOR MAKING PLASTIC PARTS, PRODUCTS, COMPONENTS AND DETAILS. THERE ARE MANY PRODUCTS MANUFACTURED BY PLASTIC MOLDING AND THEY DIFFER GREATLY IN SIZE, COMPLEXITY AND APPLICATION. THE PROCESS OF PLASTIC MOLD INJECTION INCLUDES CLAMP AND INJECTION. FIRST INJURY THE MATERIAL INTO THE MOLD , THE TWO HALVES OF THE MOLD MUST FIRST BE CLOSED TIGHTLY WITH A TIGHT CLAMPING SET THE REMAINING INJECTION IS NORMALLY IN PELLET FORMS THAT ARE PUT INTO THE INJECTION MOLDING MACHINE IN THIS PROCESS THERE IS VERY HIGH HEAT AND PRESSURE THAT IS THE PRODUCTION PROCESS OF PLASTIC INJECTION.

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I will write about the plastic molding production process. There are many types of plastic molding production process, most of which are mold casting. The name of the process is plastic molding. In the production process it has many steps. First we have to prepare a material that is recyclable plastic beads, then we heat it to a temperature where the plastic can melt and then put it on a conveyor belt to let the plastic melt into the mold. In the plastic injection machine, there are 2 mold parts to create the desired shape that we make and there are holes in the mold to let out air. After molding, we dip it in cooling water and take it to the place of consumption.

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Unit 6: Plastic

Plastic is a synthetic material that consists of long chains of polymers. There are seven types of plastic, each identified by a resin identification code (RIC) ranging from 1 to 7. The most common type is polyethylene terephthalate (PET), which is labeled as #1 and is known for its clarity, strength, and lightweight nature. PET is commonly used in the manufacturing of beverage bottles, food containers, and polyester fibers for clothing. It is highly recyclable and widely accepted for recycling. Other types of plastic include high-density polyethylene (HDPE,2), polyvinyl chloride (PVC), low-density polyethylene (LDPE, #4), polypropylene (PP), polystyrene (PS), and other miscellaneous plastics (7). Each type of plastic has distinctive properties and applications, making it suitable for various industries and purposes.(121 Words)

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One popular CAD program is AutoCAD, developed by Autodesk. AutoCAD offers a wide range of features that make it a powerful tool for design and drafting. It allows users to create and modify 2D and 3D designs, with advanced modeling tools, parametric constraints, and easy-to-use editing commands. AutoCAD also provides an extensive library of standard symbols and blocks, making it efficient for creating technical drawings. Additionally, it offers features like automated dimensions, annotation tools, and layers for organizing and managing complex drawings. One advantage of AutoCAD is its compatibility with other CAD software, enabling seamless collaboration and file exchange. Moreover, it provides advanced rendering capabilities, allowing users to create realistic representations of their designs. However, AutoCAD does come with some disadvantages. For instance, it requires a significant initial investment and can be quite complex, requiring proper training to utilize all its functionalities effectively. Additionally, the software may not run smoothly on older or lower-end computer systems.

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Unit 5 Cad Writing Task 6

CAD (Computer-Aided Design) is the use of computer software to create and modify designs, while manual drafting is the traditional method of drawing by hand using drafting tools. CAD allows for the creation of precise, accurate, and complex designs with ease, as it offers a wide range of tools, such as automated dimensioning and geometric constraints. On the other hand, manual drafting requires skilled drafters who possess knowledge of technical drawing principles and must use tools like rulers, compasses, and templates to create drawings. When comparing CAD and manual drafting, CAD offers several advantages over the traditional method. Firstly, it allows for faster design iterations and revisions, as changes can be made easily and quickly. Additionally, CAD provides better accuracy and consistency, eliminating human errors that are common in manual drafting. Furthermore, CAD enables easier sharing and collaboration, as designs can be emailed or shared electronically. However, CAD also has its disadvantages. It requires a significant initial investment in software and training, which may not be feasible for small companies or individuals. Moreover, reliance on technology poses the risk of data loss or software compatibility issues. In conclusion, CAD and manual drafting have different functions and characteristics. While CAD offers speed, accuracy, and ease of use, manual drafting requires skill and precision. The choice between the two methods depends on factors such as project complexity, budget, and personal preference. ( 235 từ)

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Unit 3 Gears and drives

Two common types of drives are belt drives and chain drives. Belt drives use a belt, usually made of rubber, to transmit power between two rotating shafts. They are known for their flexibility and smooth operation, as they can absorb shocks and vibrations. Belt drives also offer easy installation and maintenance and are generally more cost-effective. On the other hand, chain drives utilize a roller chain to transfer power, consisting of metal links connected by pins. They are known for their high strength and durability, making them suitable for heavy-duty applications. Chain drives have higher efficiency compared to belt drives due to less slippage. However, they tend to produce more noise and require regular lubrication for smooth operation. Belt drives find applications in various industries like HVAC systems, industrial machinery, and automotive engines, while chain drives are commonly used in motorcycles, bicycles, conveyors, and industrial machinery that require high torque transmission.

(165 Words)

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Unit 3 Gears and drives

A gear is a mechanical component with toothed edges that mesh with another gear to transmit power and control motion between two or more rotating shafts. Its main function is to transfer torque and change the speed or direction of rotation. There are several common types of gears, including spur gears, helical gears, bevel gears, worm gears, and planetary gears. Spur gears have straight teeth and are used for simple applications with parallel shafts. Helical gears have angled teeth, offering smoother and quieter operation while handling greater loads. Bevel gears have conical-shaped teeth and are useful for changing the direction of rotation between intersecting shafts. Worm gears consist of a threaded screw-like gear and a mating gear called a worm wheel, providing high gear reduction ratios. Planetary gears have multiple interacting gears, resulting in compact design and high torque transmission capabilities. These different types of gears find applications in various industries, such as automotive, aerospace, machinery, and robotics, enabling precise control and efficient power transmission. ( 165 Words)

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Make a short video (1-3 minutes) following the situation below.Situation: Your friend is going to make his/her first presentation in English. He/ She asks for advice. Make a short talk to show him/ her how to make an effective presentation using the following suggested questions:What is the basic structure of a presentation?What should you do before the presentation?What should and shouldn’t you do during the presentation?What should and shouldn’t you do after the presentation?

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Make a short video (1-3 minutes) following the situation below.Situation: Your friend is going to make his/her first presentation in English. He/ She asks for advice. Make a short talk to show him/ her how to make an effective presentation using the following suggested questions:What is the basic structure of a presentation?What should you do before the presentation?What should and shouldn’t you do during the presentation?What should and shouldn’t you do after the presentation?

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There are numerous kinds of bearings that serve various purposes in mechanical systems. Some commonly known types include ball bearings, roller bearings, plain bearings, and thrust bearings. Ball bearings are used to reduce friction while allowing rotational or linear movements. They consist of an inner and outer race, balls, and a cage to separate the balls. Roller bearings, on the other hand, have cylindrical or tapered rolling elements instead of balls, offering higher load-carrying capacity. Plain bearings, also known as bushings or sleeve bearings, provide low-friction support between stationary and moving parts. They typically comprise a cylindrical bore and a shaft running through it. Thrust bearings are designed to handle axial loads and are composed of washers and rolling elements, such as balls or rollers. These different types of bearings find applications in a wide range of industries, including automotive, aerospace, industrial machinery, and medical equipment. They are essential for smooth and efficient motion, reducing friction and wear, and maintaining proper alignment.

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There are several different types of couplings that serve different purposes in mechanical systems.  Some commonly known types include flexible coupling, rigid coupling, beam coupling, sleeve-style coupling.  Flexible couplings are used to connect rotating shafts while having the ability to accommodate deflections, vibrations or shock loads.  They usually consist of two centers and an elastic element.  On the other hand, rigid couplings provide a solid connection between shafts, ensuring precise torque transmission.  They are made of two flanges with a solid piece in the middle.  A beam coupling is a flexible coupling that is made by cutting a spiral shape from one piece of material.  Sleeve-style couplings are the most common rigid couplings.  These diverse types of couplings find applications in industries such as automotive, aerospace, power generation, and manufacturing. (130 Word)

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Wrting                                Write a paragraph (120- 140 words) about how to make an effective presentation using the following suggested questions:What is the basic structure of a presentation?What should you do before the presentation?What should and shouldn’t you do during the presentation?What should and shouldn’t you do after the presentation?                                      

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Wrting                                Write a paragraph (120- 140 words) about how to make an effective presentation using the following suggested questions:What is the basic structure of a presentation?What should you do before the presentation?What should and shouldn’t you do during the presentation?What should and shouldn’t you do after the presentation?                                      

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Presentation is one of the extremely important and necessary skills to convey your thoughts and ideas to everyone.  To make a good presentation, we need many factors.  First of all, you need to know the structure of a good presentation.  A presentation consists of 3 parts: introduction, body and conclusion.  The introduction includes greeting the audience, expressing the purpose, giving the structure, giving the timing and handling questions.  The development part includes introducing visual aids, introducing the next part, giving examples and summarizing before moving to the next part.  The conclusion includes summarizing the whole presentation, closing the Q&A.  Next is the presentation.  Before presenting, you need to read through the content and remember the presentation content.  During the presentation, you should present happily and confidently and have some gestures or side questions to make the presentation better.  You should not cross your arms or stand in one place when presenting.  After the presentation, you need to answer critical questions to absorb the ideas and opinions of other groups.  You shouldn't be conservative or indifferent to people's opinions.

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Unit 6 Plastic

Plastic is a versatile synthetic material that is made from polymers, which are long chains of molecules. It is created through a process called polymerization, where small molecules called monomers are chemically bonded together. Plastic has become an essential part of our daily lives due to its unique properties. It is lightweight, durable, flexible, and can be molded into various shapes and sizes. In the past, plastic was primarily used for everyday items such as utensils, containers, and toys. However, advancements in technology have expanded the use of plastic in numerous industries including packaging, construction, automotive, electronics, and healthcare. Unfortunately, the extensive use of plastic has also led to environmental concerns, such as pollution and waste. Efforts are being made to reduce, recycle, and find alternative materials to replace single-use plastics. The future of plastic lies in developing more sustainable and eco-friendly solutions to minimize its impact on the environment.(150 Word)

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The check valve is made of cast iron. There are 6 basic steps to create a check valve. First, is the valve body casting. This job holds significant importance as it determines the shape of the valve. In the second step, the valve is machined. They use a lathe to turn the workpiece to remove excessive materials. Next is drill holes. Engineers use drills to punch holes in the check valve body. After drilling is painting, that is an important step. The main purpose of valve painting is to protect the valve from rust and corrosion. To prevent corrosion, engineers use highly anti-corrosion paint to cover the valve surface. The next step is bolting. When the paint is dry, the parts are bolted together using nuts and bolts. The last step to complete a check valve is inspection. Engineers check the valve’s durability, material testing, operating pressure, structural check, watertight test. If it passes all the testing steps, we will have a standard check valve.