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nice voice

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really nice. Keep doing your great work 💪💪💪

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The lathe machine is one of the most common and versatile machines used in industries. It can perform various operations such as grooving, turning, and knurling, The main function of the lathe machine is to rotate the workpiece on a spindle against the tool at a certain speed to cut away excess material and produce the desired shape and size for the work.  And for the lathe to work smoothly, we need to carry out regular maintenance for it. we need to check the air pressure every day to make sure the air supply unit is working properly, and the filter chip needs to be checked once a day to ensure that no impurities adhere to and block the flow of the solution. The coolant needs checking every week to prevent damage and keep the engine at the correct operating temperature.  finally, we should inspect the spindle bearing every six months a year to prevent offset of the spindle causing vibration shake and possible machine failure.

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There is a very common type of machine and it appears in most mechanical workshops today. it is a milling machine. it has some outstanding features such as Milling machines can be set up for automated or semi-automated operations. so it is used for plane machining, adding holes, and groove machining, And for the mill to work smoothly, we need to carry out regular maintenance for milling. First, we should clean the machine weekly to remove dust and dirt. Second, the coolant needs to be renewed every three months to prevent damage, keep the engine at the correct operating temperature, and help it warm up quickly in cold weather and got too hot when under stress. Next, the machinery should be lubricated monthly to cut down on friction and heat. Finally, the electrical need to be inspected every e month to prevent the risk of fire.

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This is a process of making a big bottle. There are 6 steps to make a plastic bottle. As you can see in the picture is all pellets od plastic from the hopper are fed into the extruder and heated. Step 2 is screw is rotates to push molten palstic through the nozzle. Step 3 is close two half of mould cavity. Step 4 is that liquids come through the nozzle to the mould cavity . Step 5 is the air hose is open and blow the parison in the mould cavity then the cooling system is start and the liquid of plastic is cooled into right shaped of mould . step 6 is open two half of mould cavity and a product is ejected

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There are 3 common problems in plastic injection moulding is short shot, void and sink mark. First is short shot problem. It is not enough plastic in the shot or plastic pressure loss in the mould is too high. Solution of this is reduce wall thickness and slow down cooling rate  Second problem is sink mark that appear in the thicker regions of moulded objects. And solution for that problem is  is have enough of shot size, reduce mould temperature. Last problem is void that have air pockets” in transparent molding. Most common suggestions would be to increase the shot volume, increase injection pressure, increase screw forward time, reduce melt temperature, or adjust the injection speed.

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Now i will give you some basic information of plastic. as you know, plastic is a synthetic material that uses polymers as the main ingredient, plastic is able to molded or shaped into any form. plastic has the property is versatile, lightweight, and durable and some kinds of plastic are safe to recycle. in the past, we couldn't able to mold plastic into complex shapes. nowadays, manufacturers mold plastic into a variety of complex shapes. moreover plastic possible can replace components in engines with plastic. in the future, soon it will be possible to use eco-friendly bioplastic in a wide range of applications in electronics, telecommunications, aerospace, automotive, and other fields. plastic has the advantages are convenient, lightweight, cheap, durable, reusable, and resistant to outside factors. However, using too much plastic every day, people may face with different problems. First,  plastic can hurt the environment, second, plastic can not be biodegradable, finally, plastic some times can not be recycle.

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As far as i know, now i will talk a bout som types of plastic. There are seven types of plastics. First is pet, this plastic code is 1. Pet plastic could oxygen prevention and recycle so it is mostly used for food and drink packaging. Also. Second, hdpe plastic has code 2, it's much stronger and thicker than pet.  Moreover, it's relatively hard and resistant to impact and can be subjected to temperatures of up to 120° c. Hdpe plastic is used for bags, milk jugs, recycling bins, playground equipment, and shampoo bottles. Third is pvc. It has code 3. It is rigid and flexible so it is used to produce door and window profiles and pipes. Fourth is ldpe. It has code 4. It is flexible, odorless, transparent, and recyclable so it is used to produce plastic containers and wraps. Fifth is pp plastic, it has code 5. It is hard and sturdy so it is used to produce car parts and thermal vests. Next is ps has code 6. It is cheap plastic and easy to create. It can be found everywhere from beverage cups to insulation. Finally is others plastic. It has code 7. It is strong, and tough, and can be used to create lenses for sunglasses, sports, and safety goggles.

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The check valve is made of cast iron. The first step is casting, in this step, the hot liquid material is poured into a container and cooled to make the correct shape of the check valve. The cast iron is then turned, in this step, materials are turned on a machine called a lathe. part of the materials is removed to make the correct shape of the check valve. Next, the holes are made using a drill. After drilling, we painted the check valve, in this step the surface is covered with paint, and the next step is bolting, pieces of materials are joined together using a nut and a bolt.Finally, we complete rechecking carefully a product, This is when we make sure that the part is made properly.

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Unit 5: Manufacturing process || Car Wheel

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Writing 2: Computer-aided Design, abbreviated as CAD in English (computer-aided design), is widely used in computer-aided equipment platforms for engineers, architecture professors, and other professionals. other user design experts. Products range from 2D system platforms to 3D modeling surfaces and shapes.
The features of CAD vary depending on the specific program, but some common features include 3D modeling: CAD allows users to create and edit 3D models of objects and products. 2D drafting: CAD can also be used to create and edit 2D drawings, such as blueprints and schematics. Simulation: CAD software can be used to simulate the performance of products in real-world conditions. Collaboration: CAD software allows users to share and collaborate on projects electronically.  Data management: CAD software can also be used to manage CAD data.
The function of CAD is to Create and edit 3D models
Create and edit 2D drawings, Simulate the performance of products
Collaborate with other users on projects and manage CAD data.
The advantages of CAD are Free and open-source, Powerful features, Easy to use, Widely used in industry, and Good support from the community.
The disadvantages of CAD are Not as well-known as some commercial CAD programs and can be complex to learn for beginners.

CAD is a powerful and versatile CAD program that is well-suited for a wide range of applications. It is free and open-source, easy to use, widely used in industry, and has good support from the community.

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Writing 1: CAD and manual drafting
CAD is a digital method that uses software to create and edit drawings. Manual drafting is a traditional method that uses pencils, rulers, and other tools to create drawings on paper. Functions Both CAD and manual drafting are used to create technical drawings, such as blueprints, schematics, and assembly instructions. However, there are some key differences in how the two methods are used.

CAD is often used for complex drawings that require a high degree of precision. CAD software can also be used to create 3D models of objects and products. Manual drafting is often used for simpler drawings that do not require a high degree of precision.
CAD has several advantages over manual drafting, including Precision, Speed, Ease of editing, and Collaboration. Manual drafting also has some advantages over CAD, including, Cost, Flexibility, and Personal touch. CAD also has some disadvantages, including Complexity, Cost, and Reliance on technology. Manual drafting also has some disadvantages, including Slowness, Accuracy, and Difficulty in editing and collaboration.

CAD and manual drafting are both viable methods for creating technical drawings. The best method to use depends on the specific needs of the project. CAD is a good choice for complex drawings that require a high degree of precision and speed. Manual drafting is a good choice for simpler drawings that do not require a high degree of precision or speed.

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Writing 1: A gear is a rotating machine element with teeth that mesh with another toothed element to transmit power or motion. Bags are used in various machinery, including vehicles, appliances, and industrial equipment. Gears have two main functions: To transmit power from one shaft to another. To change the speed or direction of rotation. Gears can also increase or decrease torque, which is the rotational force applied to a shaft. There are many different types of gears, but some of the most common include Spur gears, Helical gears, Bevel gears, and Worm gears. The features of gears vary depending on the type of gear. However, some common features include Tooth profile; The tooth profile of a gear determines how it meshes with other gears. Module: It is defined as the ratio of the pitch diameter to the number of teeth. Pressure angle: The most common pressure angle is 20 degrees. Gears are used in various applications, including Vehicles, Appliances, and Industrial equipment. Gears are an essential component in many different types of machinery. They allow us to transmit power and motion efficiently and reliably.

Writing 2: There are two main types of drives: belt drives and chain drives. Belt drives use a flexible belt to transmit power from one shaft to another. The belt is typically made of rubber or plastic and has teeth that mesh with pulleys on the two shafts. Chain drives use a metal chain to transmit power from one shaft to another. The chain is typically made of steel or iron and has links that mesh with sprockets on the two shafts. Both belt drives and chain drives are used to transmit power and motion. However, they have different strengths and weaknesses. Materials: Belt drives typically use rubber or plastic belts, while chain drives use metal chains. Operation: Belt drives operate by the friction between the belt and the pulleys. Chain drives operate by the interlocking of the chain links with the sprockets. Slippage: Belt drives are more likely to slip than chain drives. This is because the friction between the belt and the pulleys is less than the interlocking of the chain links with the sprockets. Efficiency: Chain drives are more efficient than belt drives. This is because there is less friction between the chain links and the sprockets than between the belt and the pulleys. Maintenance: Belt drives require less maintenance than chain drives. This is because the belts are less likely to wear out than the chains. Some specific applications of belt drives include Automotive engines, Appliances, Conveyors, and Machine tools. Some specific applications of chain drives include Bicycles, Motorcycles, Industrial machinery, and Agricultural equipment.

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To have a good and effective presentation, we need to prepare carefully. The basic structure of a presentation includes 3 main parts (plus questions): Introduction, Body, and Conclusion. Before the presentation, you should sketch out your presentation, practice your presentation first to be more fluent, etc. Especially, take deep breaths and be confident to achieve good results. Those are the things before presenting, so what should we not do during the presentation? We should not turn our backs to the audience, avoid moving our hands too much,... and especially DO NOT talk and do something simultaneously because it will make the audience feel disrespected. important. We need to know who our audience is, we should create opportunities for the audience to participate in the presentation...After the presentation, if possible, listen and collect opinions from the audience. Please find out how they feel about your speech, listen and improve the weak points. We should not leave that position immediately after finishing the presentation and go the audience there. Those are ways to make presentations more attractive and more effective.

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Writing 1:  A coupling is a machine part used to connect strange parts, transmitting motion from one part to another. In addition, they also act as hinges to open and close the mechanism, prevent overload, help reduce dynamic loads, and reduce eccentricity between connecting shafts... There are two main types of joints: rigid coupling and flexible coupling. The parts of the rigid coupling include the two shafts to be connected, the power transmission part, and the buffer part. Features of the flexible coupling include two connected shafts, spacers, and deflection compensators. The characteristics of the rigid coupling are high rigidity: the rigid coupling does not allow the shaft to rotate misaligned, can withstand large loads, can withstand large loads, and low price: rigid coupling has a low price. The characteristic of flexible coupling is flexibility: flexible coupling allows the shafts to rotate at a certain angle, reducing vibration: flexible coupling can reduce vibration. Rigid couplings are used in applications requiring high rigidity, such as gear drives. Beam matching is used in applications requiring high flexibility, such as automotive transmissions.

Writing 2: Bearing is a machine component used to support load. There are 2 main kinds of bearings: rolling contact bearings and journal bearings. Some examples of rolling contact bearings can be mentioned are ball bearings, straight roller bearings, thrust roller bearing, tapered roller bearing, etc... Ball bearing is a kind of bearing that uses spherical rollers to support radial and axial motion, straight roller bearing uses cylindrical rollers to support radial motion, Thrust roller bearing uses barrel-shaped rollers to support thrust forces, while tapered roller bearing uses conical rollers to support both radial forces and moderate thrust forces. Journal bearings are different from rolling contact bearings because they don’t have rolling parts, the load capacity of journal bearings is high but the load capacity of rolling contact bearings is low to medium.

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Unit2: Couplings and Bearings/ Talk about couplings

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Unit2: Couplings and Bearings / Talk about bearings