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If you are wondering how to make an effective presentation. You will find tips and tricks to help your presentation better in this paragraph. This paragraph contains 4 main parts: the basic Instructure, What should and shouldn't you do before, during and after the presentations. Firstly, about the basic structure, it is divided into three parts: Introduction, body and Conclusion. Next is the things you should do before the presentation. You should be prepared and organized, know your audience , choose a presentation style and outline the plan what you want to present. Besides, you also should write down the presentation , practice and visualize your success. Oh, turn of the phone and check the equipment before presenting also are things you need do. Next, During the presentation. In order to make an effective presentation, you should use more gestures, facial expressions and make eye contact with the audience. Please don't just look at he paper and read, you also shouldn't look at the t floor or ceiling, put your hand on your hips or pockets. Finally 1 After the presentation, you need to thank the audience and try to answer your questions. I hope that my. tips can help your presentation is more effective

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https://drive.google.com/file/d/11GIrhzgE8gYE4dE2l4OFKfzf9tbiccpY/view?usp=sharing

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Couplings are the mechanic items. The functions. of them are to connect the shaft and transmit power from one to another. There are 2 types of  couplings : Rigid couplings and flexible couplings Beam couplings is a typical type of flexible couplings and sleeve - style coupling is the most common of Rigid coupling Beam coupling or flexible couplings are used when there is a slight misalignment. Sleeve -style coupling or Rigid couplings are used to hold the shaft in perfect alignment. Beam couplings are often cut in a spiral shape and they are to reduce noise and unwanted vibrations Sleeve style couplings are used to maximize performance and efficiency of the machine and reduce wear on machines.

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https://drive.google.com/file/d/13bmLws_m4sGynpbs1Qd16IqtLn3X0wsQ/view?usp=sharing

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Bearings are the mechanic item. They contain Rolling Contact Bearing and Journal Bearings, Rolling content Bearings one use rollers to support loads. They are consists of 3  main parts: Rod Rollers, Inner race rotates with the shaft and the outer race remains stable relative to the shaft . There are 4 main types of rolling contact bearings:

+ ) Ball bearings are used to support radial and axial load using spherical rollers

+) Straight roller bearings use cylindrical rollers to

support radial motion ..

+) Tapered roller bearings are used to support radial

forces and moderate thrust forces using conical rollers .

+) Thrust roller bearings use barrel-shaped rollers to support thrust motion.

The second type of bearing is Journal Bearings. It is a bearing that uses a lubricated sleeve and has no rolling parts. They are used when the load - carrying capacity is high.

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https://drive.google.com/file/d/17A3MBpICv66KwCInF7Z0XwbT98M-vZna/view?usp=sharing

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Gear is a rotating circular component machine with teeth , which mesh with another toothed part to some of The main functions of gears are to the power and motion between machine components transmit torque and change the speed, torque and direction of a power source. There are five types of gears: Spur gears, helical gears, worm and worm gear rack and pinion, and bevel gears. Spur gears have teeth projecting towards or away from the center using in low -speed applications but they can not control noise at high speed. Helical gears have their teeth cut in a spiral shape, they are used in high speed applications, large power transmission Next is worm and worm gear, A worm has just one continuous tooth and it pairs with a worm gear, they are used for reducing speed. About rack and pinion, they consist of a circular gear on the pinion engaging a linear gear or the rack  to convert rotational motion into linear motion. Finally is bevel gear, they have a conical form and can be used to transmit rotational power through shafts at an angle, normally 90 degrees.

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As I know there are two types of Drive: Belt drive and chain drive. Belt drive is used to transmit motion and power from One shaft to another by means of friction between belts and pulleys while chain drive is for transmitting motion and power between successive chains with sprocket special toothed Wheels. They have some differences. Belt drive is made by rubber, plastic. Chain drive are different from Belt drive because it is made of metal. Belt drive reduces noise and vibration during operation, Unlike belt drive, chain drive causes these problems. Slippage occurs in belt drive but it doesn't occur in chain drive. While belt drive has low efficiency due to frictional loss, chain drive has high efficiency (above 95%). The belt tension of belt drive is affected by atmospheric condition and temperature. Unlike belt drive, chain drive is not. Belt drive requires minimum maintenance except for belt re-tension while chain drive requires regular lubrication. About some application of each type, chain drive is applied in Bicycle, motorcycle, agricultural and textile machinery and material handling equipment while belt drive is used in flour mills, coolant pump, lubricant pump, AC, cam shaft alternator, lath machines and a lot of other machines.

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https://drive.google.com/file/d/1Dj42FMH_qeRhUjE5hidpcTmlN8dTI51I/view?usp=sharing

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https://drive.google.com/file/d/1DkGuvaGWLRDMrJuXPWQ7RJqIlHvuCSIG/view?usp=sharing

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Writing: Compare CAD and manual drafting

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Writing: Compare CAD and manual drafting

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Computer - aided design (CAD) is the creation and handling of pictures on a computer to assist engineers in design and drafting. Manual Drafting is the practice of creating drawings by hand with pencil or ink on a media such as paper or polyester film using drafting equipment. While CAD has a quick layout of a preliminary design and necessary change, manual drafting has the capability to create single detailed drafting (by hand with pencil or ink). CAD needs operation skills (in minimum) and Analytical skills. Unlike CAD, manual drafting requires designing skills and explanation skills. CAD has high accuracy (in representation) and has error (in explanation). Manual drafting is different from CAD, it is easy misreading because of ambiguity and drawing errors . CAD is easy to use and flexible so designers make changes or modifications easily. Unlike CAD manual drafting takes time consuming because drafter has to start from the beginning to make changes.

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Writing: Describe a specific a CAD program

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Writing: Describe a specific a CAD program

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I want to introduce a CAD program I know. It is

Solid Works. SolidWorks was first released in 1997 and now it has become one of the most used programs in professional settings across the globe. It has lots of functions but designers often use it to sketch out ideas, experiment with features and dimensions. SolidWorks also has the capability to produce models and detailed drawings. Some pros of this CAD program are that it is easy and intuitive to use from the beginning, easy to use for 3D modeling. It's also quick and easy to create parts, add them to assemblies and create drawings. Besides pros, SolidWorks has some cons. This program is expensive. It also contains some unnecessary features for the common user.

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Speaking: Compare CAD and manual drafting

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Speaking: Compare CAD and manual drafting

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https://drive.google.com/file/d/1IxWfbHnuff3TIHdc0nuUE4ux6Bz9KZSt/view?usp=sharing

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Speaking: Describe a specific a CAD program

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Speaking: Describe a specific a CAD program

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https://drive.google.com/file/d/1IzDWgdqH9_iZ40qhdQcU0k8iBULuO2Hd/view?usp=sharing

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The check valve is made of cast iron. There are 6 steps you need to follow when manufacturing a checked value. The first step is casting . In this step hot liquid of cast iron is poured into a container and then cooled to make the correct shape. The cast iron is then turned on a lathe to remove excessive parts. Next step is drilling, holes are made using a drill. After the drilling process, the next step is painting, the surface is covered with paint. Next step is punching, in this step holes are punched in a material. The final step is inspection, in this step, the product is checked carefully.

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Speaking: Manufacturing process of a car wheel

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Speaking: Manufacturing process of a car wheel

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https://drive.google.com/file/d/1P_pPxRc3O97kJzpDW_PGnqyPFSXywZ0e/view?usp=sharing

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Speaking: Manufacturing process of a gear

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Speaking: Manufacturing process of a gear

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https://drive.google.com/file/d/1PaEulSrLGBPqxUhKNujtp9mXAdbd7TgG/view?usp=sharing

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Writing: Write a paragraph about basic information of plastic

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Writing: Write a paragraph about basic information of plastic

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As far as I know, plastic is a synthetic material. It is versatile, safe, lightweight, durable, chemically unreactive and cost-efficient. So, what can people do with plastic? In the past, about 100 years ago, manufacturers could produce modern synthetic plastics. We couldn't mold plastic into complex shapes. Nowadays, manufacturers can mold plastic into a variety of complex shapes. At present, it is possible to replace components in engines with plastics and plastics can be used in manufacturing to help designers reduce weight in aircraft. In the future it will save money and increase efficiency by using smart plastic coatings on manufacturing components. Soon, it will be possible to use eco-friendly bioplastics in a wide range of applications in electronics telecommunications, aerospace, and automotive. In the near future, we will be able to make plastics from any kind of plant materials. Using plastic brings us a great number of benefits. It is convenient (shopping plastic bags), lightweight (plastic bottles) and cheap posting - (packaging and wrappings). It is also durable and resistant to all kinds of adverse outside factors (heavy rain, storms). However, using too much plastic every day people may face with different problems. First, plastic can hurt the environment. Second, it can not be biodegradable. Finally, plastic cannot be recycled.

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Writing: Write a paragraph about your understanding of plastic. You should mention the seven types of plastic and their codes, a common type of plastic with its properties and its applications.

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Writing: Write a paragraph about your understanding of plastic. You should mention the seven types of plastic and their codes, a common type of plastic with its properties and its applications.

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As far as I know, there are 7 types of plastic. Number 1 is PET - polyethylene terephthalate. Number 2 is HDPE high - Density Polyethylene . Number 3 is Polyvinyl chloride -  PVC. Number 4 is Low Density Polyethylene - LDPE. Number 5 is PP - Polypropylene. Number 6 is Polystyrene (PS) and Number 7 is others plastics. In the 7 types of plastics, Number 1 - PET is the most common type of plastic. It hold the number 1 spot because of its widespread utility. It is mostly used for food and drink packaging purposes due to its properties: oxygen prevention and widely recycled.

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Speaking: Talk about basic information of plastic

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Speaking: Talk about basic information of plastic

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https://drive.google.com/file/d/1U8YY67PWx5ZNZE2zNe2H932_k7x84mPR/view?usp=share_link

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Speaking: Talk about a common type of plastic with its properties and its applications.

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Speaking: Talk about a common type of plastic with its properties and its applications.

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https://drive.google.com/file/d/1U8y79A-UtUnKsDg0gvG517dMe-fKe_aG/view?usp=share_link

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Speaking Unit 6: a common type of plastic with its properties and its applications..mp4

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Writing: Write a paragraph (120-140 words) to describe the following plastic moulding process

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Writing: Write a paragraph (120-140 words) to describe the following plastic moulding process

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As I can be seen in figure 1, this is the process of extrusion molding. There are 6 steps in this process. In Step 1 , we move the polymer pellets from the hopper to the cylinder. Next, An electric motor turns to the screw in the extrusion molder. After that, the cord polymer pellets move along the cylinder. In the next step, Heaters warm the polymer pellets to turn them into a liquid. Next, the warm, soft molten polymer moves along the cylinder. Finally, the machine pushes the molten polymer out into the mould.

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Writing: Write a paragraph (120-140 words) about typical problems typical problems of plastic injection moulding and explain causes and solutions to these problems.

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Writing: Write a paragraph (120-140 words) about typical problems typical problems of plastic injection moulding and explain causes and solutions to these problems.

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In plastic injection moulding there are 2 typical problems : void and sink mark. Void is a phenomenon when a pocket of air is trapped within or close to the surface or an infection moulded prototype. Void is caused by plastic shrinkage (a hole suddenly develops in a thick section during cooling). In addition, plastic volume changes when plastic is heated or cooled. To solve this problem, you need to increase the injection pressure to force more material into the mould and reduce shrinkage, reduce wall thickness, slow down cooling rate and increase gate size and locate it at the thick part of the moulding. Next problem is the sink mark. It is a phenomenon in which the surface of the finished part has holes in the thicker area of the injection molded. The main causes of sink mark are the internal stress is too high and the part has too low a surface rigidity. To solve this problem, we need to have enough shot size, increase holding pressure and holding time, Moreover, we also need to reduce mould temperature and all reduce wall thickness for faster cooling.

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Speaking: Make a short video (1-3 minutes) to describe the following plastic moulding process

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Speaking: Make a short video (1-3 minutes) to describe the following plastic moulding process

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https://drive.google.com/file/d/1_M_uvoGz4Aiw1edbNYSjErTMTPNL_PCD/view?usp=share_link

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Speaking unit 7 describe the following plastic moulding process.mp4

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Speaking: Make a short video (1-3 minutes) to talk about typical problems typical problems of plastic injection moulding and explain causes and solutions to these problems.

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Speaking: Make a short video (1-3 minutes) to talk about typical problems typical problems of plastic injection moulding and explain causes and solutions to these problems.

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https://drive.google.com/file/d/1_P2ztIyZjB-TeEKPh5QoWA7GTlNhdiqz/view?usp=share_link

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Speaking unit 7: Make a short video (1-3 minutes) to talk about typical problems typical problems of plastic injection moulding and explain causes and solutions to these problems..mp4

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My job is a lathe maintenance worker. my job is to check the line pressure gauge, check the air pressure and increase the spindle speed. In addition I clean the chip filter I do the above work every day. As for things like checking all the filters, checking the coolant level, checking the oil and changing the oil, I do it weekly. As for the main bearing inspection, belt drive inspection, oil change and oil check, I do it every half a year. That's my whole job.

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This is a high performance cutter. it can cut with very high productivity and the product output is 3 times that of ordinary cutter. This machine is specialized for cutting solid cylindrical iron ingots. because of operating in conditions with a lot of chips, iron dust, high engine and blade temperature. In order for the machine to function properly and avoid breakdowns, regular maintenance is required. First of all, it is necessary to sweep the chips daily after work to prevent dirty chips from sticking to the engine causing the engine to overheat leading to a short circuit. Check weekly and add enough coolant to prevent damage to the workpiece and cutting edge. working . monthly, check the machine shaft for cracks or open circuit to avoid accidents while working.

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https://drive.google.com/file/d/1dOfAqnaN7FqroiPm9VIOYSZNRQY3ystC/view?usp=share_link