How to learn to read mechanical drawings

Question 1: Teach you how to quickly understand mechanical drawings (super practical version) and read object information. Although the drawings will be different for everyone and every company, they follow the national drawing standards. A drawing is made for people to see. If there are too many special places and others cannot see it, it will lose its meaning. . First, look at the object name, number, quantity, material (if any), proportion, unit and other information in the title bar (lower right corner). The location of this information can be found in the relevant parts of the manual.

Determine the view. If it is a non-standard drawing such as a schematic diagram, there is no strict concept of view. Standard drawings have at least one view. The concept of view comes from the projection of drawing geometry. You can also read the relevant content in the manual for this knowledge. Simply put, according to our country’s drafting standards, an object is called the main view when viewed from the front, and the main view when viewed from the left. It is the left view (placed on the right side of the main view), the top view is called the top view (placed below the main view), and the sectional view and many other view concepts. Reflected in the drawing, the view is just a piece of thing. There are no dimensions, text, lines, etc. between the blocks to connect them. There is a blank space in the middle. People with architectural and other viewing abilities will be familiar with these concepts, and they are all universal.

Distinguish between main body and annotation. After determining how many views there are and what they are, we need to distinguish the main body (let’s call it that for now, I invented this word). The main body is the lines that describe the mechanical parts (in the actual two-dimensional world of parts, these are the Lines), which can be distinguished based on the thickness of the line (thin lines are all marking lines). The main lines only have thick solid lines (thickness can be judged by relative comparison, and there are also standard thicknesses in the standard), thick dotted lines and section lines .

Restore the actual appearance of parts from the main body. This is the key point of the view. Everything else can be done by reading books and flipping through manuals. Only this requires accumulation and spatial imagination. If you cannot restore the appearance of the actual parts, you will have that joke about digging a well but building it. A chimney. If you have difficulty when restoring, you can carefully determine what view each view is (including expression methods such as section views), and auxiliary dimensions (for example, R represents radius, and that line is an arc (surface). These annotations are in the manual. Yes, it is relatively simple.

Determine the size of the parts. You can just take a look at it and have a rough idea. If you are a manufacturer, you can check it again when you use it.

The dividing line between outsiders and outsiders. At this point, as long as you have read the drawings and studied the content expressed in the drawings in the mechanical design manual, you can be regarded as a layman who understands the drawings, just like you look at a house. After reading the drawings, you know the structure and size of the house. If you don’t want to go into details, you can stop here. However, the mechanical drawing information is far more than that.

Get into mechanical drawing reading. (What is mentioned here are standard diagrams, schematics, etc. without introduction) It expresses the structure, size, material, accuracy, etc. of a part or component or a machine, etc. All design data used in the mechanical industry, which has been After seeing the material and structure parts, I will talk about other information later. Since almost all the mechanical information is in the drawings, and the mechanical design manual alone has thousands of pages, so I cannot share all my experiences here, only my experience in the industry.

Accuracy. Mechanical dimensions (such as the diameter of a cylinder) are not just a dimension. Whether the tolerance is marked (±0.XX) or the size is not marked, it is a range. This is Mechanical (dimensional) accuracy must always be a concept. Because mechanical parts are generally produced in large quantities, precision is required to control the size of each part (they cannot be the same size, there will be errors) within a certain range. .Similarly, parts also have geometric tolerances (they exist whether marked or not). The unmarked accuracy (tolerance) is stipulated in the national standards, and some drawing technical requirements will state that the accuracy is the mechanical zero. The soul of the component requires a certain amount of accumulation. You can learn the accuracy information on each drawing by referring to the manual.

Roughness: Roughness determines the usage requirements and also limits the processing method requirements.

Accuracy: For example, the size, position, shape tolerance and roughness requirements of an element (an inner hole for bearings) will imply processing technology requirements (grinding) for it.

Heat treatment: Heat treatment makes processing feasible and the performance meets the usage requirements.

Surface treatment: Surface treatment is generally stated in the technical requirements. ...>>

Question 2: How to learn to read mechanical drawings the fastest? Compare the parts with the drawings. I believe it will be soon.

Question 3: How to learn to read mechanical drawings and master CAD in a short period of time 1. You can start with simple drawings and start to understand dimensions and tolerances from a geometric perspective.

2. Find a better mechanical forum, such as the 3D forum. See if other newbies’ questions are worth learning from. After you have a certain understanding, if you encounter something you don’t understand, please post for advice in a timely manner.

3. For getting started with CAD, you can watch Tiger Studio’s CAD video tutorial. After you become proficient, use the left-hand key.

I had a similar experience before, switching from electronics to machinery. The conclusion is to spend more time choosing appropriate textbooks. Never choose a bunch of thick textbooks to learn CAD unless you have enough time and patience. Nowadays, when training new employees without any mechanical foundation, the above three items are followed. Finished in 1-2 weeks. Especially CAD, you can get started quickly after getting started.

Question 4: How to understand CAD mechanical drawings? Machinery is a very broad definition. If you want to enter this industry, reading and drawing are the most basic and basic knowledge that must be mastered. Otherwise, you can't even understand the drawings, let alone other things.

First of all, you need to learn "Mechanical Drawing" or other drawing books, but I recommend learning this one. It is mechanical. If you just want to learn CAD and just be a draftsman, these are enough. Yes, because it basically allows you to show pictures, but the machinery industry is a very comprehensive industry, and you also need to know other professional knowledge, such as materials, processes, tolerances, cutting tools, design, etc., so that you can go deeper Go one level inside the machinery industry.

Many parts of manufacturing machinery are automated or semi-automated. You need to understand new processing techniques, operating principles, maintenance, etc.; design is more about using software, and it is no longer the manual setting out like before. , so you also need to know 3D software.

This industry requires experience, and many things can only be understood through practice, so whether you want to learn CAD or are already working, if you want to learn mechanics well, you must do a good job in the next step. It took a lot of mental preparation.

I hope you can learn mechanics well!

Question 5: How can I learn to read drawings if I don’t know how to read them? There seem to be a lot of places or symbols that I don’t understand at first, but if you look through more drawings and summarize them, you will actually find commonly used ones that you really don’t understand. Just ask those who study mechanics. That's it. This is the fastest way. Of course, you can also read mechanical drawing textbooks and you can basically understand... If you want to really You can quickly imagine the shape of the space and the basic craftsmanship when you see the drawings. You need experience. You can finish it in a week and be familiar with it. Of course, you also need to know something about machinery and read more. If you don’t understand, just ask. Just go check the information. Since you can use CAD to draw, I guess learning is enough. You can borrow a book from a mechanical school graduate. Question 6: I want to learn to read mechanical drawings. What do I need to do? For 5 points, you have to learn mechanical drawing. Only then can you learn to read the drawings. If you really can't, buy a book and read it carefully, and then look for some drawings to look at.

Question 7: What do you think of basic mechanical drawings? The main responsibility of this mechanical drawing is to allow others to draw physical drawings and manufacture products based on what they can imagine! To reach this level, you must at least learn the knowledge points of the books "Drawing Geometry" and "Basics of Mechanical Drawing", so that you understand how the picture is drawn and why it is drawn like this (this is mechanical Industry rules) As long as you understand the principles, read more, think more, and draw a few pictures with your own hands, it’s easy to see a few mechanical drawings. Just give me these suggestions. If you don’t understand, you can still ask!