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Get access to files anywhere through secure cloud storage and file backup for your photos, videos, files and more with Google Drive.

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Various kinds of bearings cater to different mechanical needs across industries. Common types include ball bearings, roller bearings, and plain bearings. Ball bearings, comprising metal balls between two rings, facilitate smooth rotation and reduce friction. Roller bearings use cylindrical or tapered rollers to distribute load more evenly, suitable for heavy-duty applications. Plain bearings lack rolling elements, utilizing a sliding surface, and are adept at handling oscillating or slow rotational movements. Bearings find applications in diverse machinery, from automotive components to industrial machinery, enabling efficient motion and load distribution. Their components include outer and inner rings, rolling elements, and cages, each designed to fulfill specific functions and enhance overall bearing performance in various operating conditions.

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The manufacturing process of a check valve involves sequential steps to ensure optimal functionality. Firstly, raw materials undergo casting to form the valve body. After casting, the surfaces undergo polishing to achieve smoothness. Subsequently, drilling is performed to create necessary openings. Bolting comes next, involving the assembly of various components. Before completion, a thorough inspection is conducted to ensure quality and adherence to specifications. This sequence, starting with casting and culminating in inspection, guarantees a well-crafted check valve ready for use in diverse applications, maintaining a balance between precision and efficiency throughout the manufacturing stages.

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Two commonly used types of drives are belt drives and chain drives. Belt drives function by transferring power through flexible belts, usually made of rubber or other materials, while chain drives utilize interlinked metal chains for power transmission. Belt drives are known for their smooth and quiet operation, but they may experience slippage under high loads. On the other hand, chain drives are more robust and efficient, with minimal slippage, but they tend to produce more noise during operation. In terms of maintenance, belts are generally easier to replace than chains. Belt drives are commonly found in applications where noise reduction and smooth operation are crucial, such as in some automotive systems. Chain drives, known for their durability, are often used in heavy machinery and industrial settings where high torque and efficiency are essential.

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Nguyen Dinh Hoan 2021607021 writing unit6

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Nguyendinhhoan 2021607021 tack 1 unit4 writing 2

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Gears are mechanical components designed to transmit motion and power between rotating shafts. They function by meshing with one another to alter the speed, torque, and direction of rotational movement. There are several common types of gears, including spur gears, helical gears, bevel gears, and worm gears. Spur gears are straight-toothed and provide straightforward speed reduction or increase. Helical gears have angled teeth, offering smoother and quieter operation but are more complex to manufacture. Bevel gears have conical shapes and are often used to change the direction of rotation. Worm gears consist of a worm screw meshing with a worm wheel, providing high torque with reduced speed. These gears find applications across various industries, from automotive transmissions and industrial machinery to household appliances, showcasing their versatility in meeting specific mechanical requirements.

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UNIT 1 SPEAKING