How can novices read mechanical drawings?

How do novices understand mechanical drawing?

I have seen the materials and structural parts before making, but the drawings are very informative. Almost all the information of the machine is on the drawings, and there are thousands of pages in the mechanical design manual. The dimensions on the drawings are all shown, and all kinds of performance are particular.

Knowing the relationship between the views on the drawing can basically understand the general shape of the product represented by the drawing. According to the projection principle, objects can be placed in any quadrant. Generally, the object placed in the first image is called a projection, which is the so-called "first angle projection method", that is, the second, third and fourth angle projection methods.

Most drawings can visually represent all dimensions, and some need 6 views. The three views correspond to the front view, the left view and the top view, respectively, mainly according to the requirements of the size and shape and position tolerance of the parts, to formulate a reasonable processing scheme and processing steps, with emphasis on the technical requirements and processing technology on the drawings. If forging or casting is needed, heat treatment, turning and milling are needed. Grinding and other processing techniques must be clear. Otherwise, it will lead to quality problems in the program. If the ruler has tolerance requirements, please note that the dimensions are consistent with the drawings.

Step 1: Analyze the topic.

The essence of mechanical drawing exists in mechanical drawing, including material, name, quantity, proportion and other functional parts.

Step 2: Observe and analyze.

By analyzing different views, the structure and function of each component can be summarized. It sounds simple, but it is a bit difficult and imaginative to do.

Step 3: Size analysis.

It is very important to see the size clearly, especially the drawings of mechanical accessories, which seriously affects the normal use of mechanical drawings.

Step 4: Technical requirements.

Functional analysis of dimensional tolerance, heat treatment and surface roughness. The function and shape of the parts are further analyzed.

Step 5: Summarize.

Summarize the first four steps, and the basic parts drawing will be in your mind.

Skills of reading mechanical drawings;

1, with professional mechanical knowledge, which is needed for mechanical drawing. There are many skills and methods in mechanical drawing and foundation.

2. Knowing the basic processing technology can make you have a clearer understanding of the processing method and size of the parts, and it is easier to understand the contents of the drawings.

3. Have a rich imagination. On the contrary, there is no axonometric drawing on the drawing, and the part mechanism will give people an intuitive feeling.