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china latest news about 42 basic knowledge of mechanical drawing

42 basic knowledge of mechanical drawing

March 5, 2024

7. When drawing, it is advisable to use the proportion of the original value as much as possible. If necessary, enlarged or reduced proportions can also be used, where 1:2 is the reduction ratio and 2:1 is the enlargement ratio. Regardless of which ratio is used, the actual size of the machine ...
china latest news about 42 basic knowledge of mechanical drawing

42 basic knowledge of mechanical drawing

March 4, 2024

1. Paper formats can be divided into 5 types according to size. The drawing format codes are A0, A1, A2, A3, and A4. There must be a title bar in the lower right corner of the picture frame. The direction of the text in the title bar must be consistent with the direction of viewing the picture. 2. ...
china latest news about Characteristics and applications, advantages and disadvantages of HDPE plastic materials

Characteristics and applications, advantages and disadvantages of HDPE plastic materials

March 3, 2024

Scientific name High density polyethylene, low pressure polyethylene. monomer Ethylene - a gas produced in petroleum refining. Colour High density polyethylene (HDPE) is an opaque white waxy material that is lighter in weight than water, soft and resilient, but slightly harder than LDPE and can also ...
china latest news about Characteristics and uses, advantages and disadvantages of PS plastic materials

Characteristics and uses, advantages and disadvantages of PS plastic materials

March 2, 2024

Scientific name Polystyrene Monomer Styrene - a colorless liquid synthesized from petroleum. Colour Polystyrene is a transparent, glass like material with a specific gravity of 1.05, which is basically the same as water. It is rigid and brittle, and when struck, it emits a metallic "ding dang" sound...
china latest news about Is it better to tighten the bolts as tightly as possible?

Is it better to tighten the bolts as tightly as possible?

March 1, 2024

The tighter the bolt, the better? Is it better to tighten and reverse half a turn? A tightened bolt is subjected to two forces, one downward and the other upward. The bolt rotates along the thread and generates a downward axial force during contact with the thread. There is also an upward force ...
china latest news about What is material certification?

What is material certification?

February 29, 2024

1. Material certification: test data on the material composition, content, and related physical and chemical properties of the raw materials used in CNC machining. 2. MSDS (Material Safety Data Sheet) is a comprehensive legal document used for the production and sale of chemicals. Its main purpose ...
china latest news about Characteristics and uses of NORYL plastic materials, advantages

Characteristics and uses of NORYL plastic materials, advantages

February 28, 2024

Scientific name Modified polyphenylene ether Advantages The mechanical properties of NORYL are similar to PC, but it has several obvious advantages over PC: 1. PC is easily decomposed by water, but NORYL has no change in mechanical properties after repeated sterilization in boiling water and steam. ...
china latest news about Characteristics and applications, advantages and disadvantages of PMMA plastic materials

Characteristics and applications, advantages and disadvantages of PMMA plastic materials

February 27, 2024

Commonly called Organic glass, acrylic. Scientific name PMMA. Colour PMMA is a colorless transparent particle with a specific gravity of 1.19, heavier than water. The surface has a high gloss, and the product has characteristics of toughness, hardness, and rigidity. Combustion characteristics It is ...
china latest news about Characteristics and uses, advantages and disadvantages of PC-PBT hybrid plastic materials

Characteristics and uses, advantages and disadvantages of PC-PBT hybrid plastic materials

February 26, 2024

PC-PBT is a blend material of PC and PBT. It is usually blended and supplied in the form of pellets. If the two materials are simply mixed and then injected directly, the effect will be very poor and delamination will occur. The advantage of PC is that it is rigid and tough at room temperature, but ...
china latest news about The characteristics and applications, advantages and disadvantages of LDPE plastic materials

The characteristics and applications, advantages and disadvantages of LDPE plastic materials

February 24, 2024

Scientific name Low density polyethylene, high-pressure polyethylene. Monomer Ethylene - a gas produced in petroleum refining. Colour Polyethylene natural color is a semi transparent white waxy material with a lighter specific gravity than water, soft and resilient, slightly elongating, non-toxic, ...
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