# data[].attributes.body
I bought ball bearings, roller bearings, and thrust bearings from ABC Mechanical Supplies on September 15. Each bearing includes inner and outer rings, rolling elements, and a cage. Ball bearings reduce friction and support both radial and axial loads, while roller bearings handle heavy radial loads, and thrust bearings carry axial loads. Their applications vary: ball bearings in motors, roller bearings in gearboxes, and thrust bearings in steering systems.

# data[].attributes.body
Gears are mechanical parts with teeth that mesh together to transmit torque and motion between shafts. Their main function is to change the speed, direction, or force of rotation. There are several common types of gears, such as spur gears, helical gears, bevel gears, and worm gears. Spur gears are simple, efficient, and usually used for parallel shafts. Helical gears have angled teeth, which make them run smoothly and quietly. Bevel gears are used for intersecting shafts, while worm gears provide a high gear ratio and self-locking ability, often used in elevators or conveyor systems. Each type of gear has its own advantages and is applied in different machines depending on the requirements for speed, torque, and space

# data[].attributes.body
CAD (computer-aided design) and manual drafting are two methods of creating technical drawings for various purposes. CAD uses software to create 2D or 3D models that can be easily modified, duplicated, and stored electronically. Manual drafting uses pencil, pen, or marker on paper or polyester film to draw the design by hand. Both methods have their advantages and disadvantages. CAD is faster, more accurate, and more convenient than manual drafting. It also allows for more complex and detailed designs. However, CAD requires expensive equipment, software, and training. It also may lack the originality and creativity of manual drafting. Manual drafting is cheaper, simpler, and more expressive than CAD. It also does not depend on technology or electricity. However, manual drafting is slower, more prone to errors, and less flexible than CAD. It also requires more space and materials

# data[].attributes.body
Solidworks is 3D CAD design software based on parametric methods, running on the Windows operating system. This software has many features and functions to support design, assembly, drawing production, simulation and analysis of 3D products. Some outstanding features of Solidworks are: Can create accurate and detailed 2D and 3D drawings with flexible drawing and editing tools. Mathematical functions and constants can be used in equations to define dimensions and constraints, can simulate and test the physical properties of products such as heat, application, motion. Can interact and collaborate with project team members through solidworks cloud services. Some of Solidworks' priorities are: Intuitive, easy to use and optional interface. Available on multiple platforms and devices. Some disadvantages of Solidworks are: High price, high computer configuration requirements. Complexity for beginners, requires training and guidance

# data[].attributes.body
To make a one-way valve, we need to follow the instructions on the molten iron that will be poured into the mold to shape the valve. The next step is turning, the surfaces that require high precision will be machined to turn the valve. Create compatibility when installing. The third step is to drill holes on the valve surface. These holes are used to install bolts to connect to pipes or other equipment, so they need to be machined accurately. The next step is painting. The paint layer helps isolate the valve's surface from the outside environment, avoiding rust. The fifth step is to install the screws and bolts for the valve and the final step is to test the product, the tester will check whether the valve works well and decide whether it can be put into use or not.

# data[].attributes.body
Plastic is a type of plastic material made from polymers. Plastics have many different properties depending on the type of polymer and additives used in the manufacturing process. Plastics can have different hardness, strength, toughness, heat resistance, electrical insulation, light transmittance and color.

In the past, people could not do many things with plastic because plastic only began to be mass-produced in 1950. Plastic was mainly used to make packaging, household appliances, toys and consumer products. other. Now, people can do a lot of things with plastic such as using plastic to produce electronic components, cars, airplanes, medical equipment and many other fields. The future of plastic is very potential because plastic can be recycled or transformed into new materials.

Plastic has many advantages such as being a light, durable, inexpensive and easily adjustable material. But plastic also has many disadvantages that pollute the environment, affect human and animal health and consume a lot of energy during the production process. Therefore, we need to use plastic reasonably and responsibly.

# data[].attributes.body
The diagram below shows the plastic moulding process, which is a method of producing plastic products by shaping molten plastic into desired forms. The process consists of six steps: extrusion, heating, blowing, moulding, cooling, and ejection. In the first step, extrusion, the plastic is fed into an extruder, which pushes it through a die to form a tube. In the second step, heating, the plastic tube is heated until it becomes soft and flexible. In the third step, blowing, the plastic tube is inflated by air into a mould cavity, which has the shape of the final product. In the fourth step, moulding, the plastic tube conforms to the shape of the mould. In the fifth step, cooling, the plastic tube is cooled down and solidifies. In the sixth step, ejection, the plastic product is removed from the mould and ready for use.

# data[].attributes.body
Plastic injection molding is a widely used manufacturing process that can produce complex and high-quality parts from various thermoplastic materials. However, like any other process, it is not free from problems and defects. Some of the common issues in plastic injection molding are:

• Discoloration: This is when the color of the molded part does not match the desired or expected color, caused by the contamination or degradation of the plastic material during the molding process. To prevent or minimize discoloration, the material should be properly dried, mixed, and stored.

• Warping: This is the distortion or deformation of the molded part, caused by the uneven cooling or shrinkage of the plastic material during the molding process. To prevent or minimize warping, the cooling system and the mold temperature should be uniform and controlled.

• Vacuum voids: These are air pockets or bubbles that form inside the molded part, caused by the insufficient packing or venting of the plastic material during the molding process. To prevent or minimize vacuum voids, the injection speed, pressure, and time should be increased and optimized.

# data[].attributes.body
A lathe is a machine tool that is used for shaping and cutting metal, wood, and other materials. It has a rotating spindle that holds and spins the workpiece, and a fixed cutting tool that can move along different axes to create various shapes and sizes. A lathe can perform operations such as turning, facing, drilling, threading, and knurling. To ensure the lathe is running efficiently and safely, it requires regular maintenance work. Some kinds of maintenance work and their schedule for a lathe are:

Checking the air line pressure gauges to make sure they are within the recommended range. This should be done daily before starting the machine.

Cleaning the chip filters to prevent clogging and overheating. This should be done daily after finishing the work.

Inspecting the coolant levels and topping up oil levels to keep the machine lubricated and cool. This should be done weekly or as needed.

Inspecting the drive belt for any cracks or damage and replacing it if necessary. This should be done semi-annually or as recommended by the manufacturer.

Changing/inspecting the oil in the headstock, gearbox, and apron to prevent corrosion and contamination. This should also be done semi-annually or as recommended by the manufacturer.

These kinds of maintenance work are important to extend the life of the machine, improve the quality of the workpiece, and prevent accidents and injuries.