What is a detailed drawing?

A detailed drawing, also known as a detailed manufacturing drawing, is a technical document that fully shows the structure and shape of a single part or describes the assembly of many parts. This type of drawing provides a clear, intuitive view, from general to detailed, helping users easily understand and apply.

In the mechanical field, detailed drawings contain important technical parameters, playing a fundamental role in the process of machining and manufacturing machinery. The ability to read, create and edit technical drawings is a mandatory requirement for engineers and workers.

If the basic principles are not mastered, errors in drawings can occur, leading to technical errors in manufacturing, directly affecting product quality, business reputation and competitiveness in the market.

Uses and contents of detailed drawings

A detailed drawing is an important technical document, containing all the necessary information to support the processing and manufacturing process of the part. This is an effective way of exchanging information between the designer and the manufacturer, ensuring consistency and accuracy from the design stage to production at the factory.

A detailed drawing not only helps to clearly visualize the product structure but also plays an important role in conveying necessary technical parameters and requirements.

A detailed drawing usually includes the following main contents:

Demonstrations:

- Including projections such as plan view, main view, side view.

- In some cases, 2D or 3D projections are added to help viewers easily visualize the structure and shape of the part.

- Cross-sections are also clearly shown to indicate important positions inside the part.

Title block:

This is where basic and important information is provided about:

• Name of the part.
• Material used for machining.
• Geometric tolerances.
• Ratio of drawing to actual size.
• Name of designer and number of parts to be manufactured.

Dimensions:

- Shows in detail and accurately the required dimensions of each part in the machine part.

- Ensures the reasonableness and accuracy of the machining and testing process.

Technical requirements:

- Includes parameters such as surface smoothness, dimensional tolerances, geometric tolerances.

- Heat treatment requirements or machining and testing notes are also clearly stated.

This section requires the implementer to have specialized knowledge to understand and apply correctly.

Today, detailed drawings are not only commonly used in the field of mechanical engineering but also widely applied in many other industries, from simple to complex projects.

Main components of detailed drawings

Detailed drawings are important technical documents, helping to ensure that products are manufactured according to technical specifications and achieve the highest level of completion. Below are the main components that should be included in a standard detail drawing:

1. Title

The title provides basic information such as:

Name of the detail.

Material of manufacture.

Finishing requirements.

Drawing scale and technical tolerances.

In addition, the title also indicates the function of the product and the applicable drawing standard (ISO/DIN).

2. Part image

The 3D image of the product helps the operator easily visualize the overall and better understand the shape of the detail.

3. Main view of the part

- The main view describes the geometry of the product in 2D form, accurately sketching the shape when viewed from the outside angles.

- Normally, 2 to 3 main projections (plan view, front view, side view) are enough to describe the entire geometry of the detail.

4. Part Section

- Section shows the internal structure of the part that cannot be shown in normal projections.

- The cutting line on the drawing indicates the viewing direction and section projections are usually aligned with the front projection.

5. Detail View

- Detail views highlight complex or difficult-to-see areas.

- These views are usually circular, marked with a letter (A, B, C…), and may use a different scale than the rest of the drawing.

6. Drawing Notes

Notes provide additional information such as symbols, signs, or special requirements that help the manufacturer better understand the product.

7. Hole Notes

Machined holes are often indicated by symbols and clear notes, such as:

Flat hole (⌴).

Flare hole (⌵).

Hole depth (↧).

8. Thread Notes

If the part requires threads, the drawing must clearly state the thread size according to the standard (e.g., M4) rather than just the thread diameter.

9. Tolerance

Tolerance ensures that the part is machined accurately within the allowable range.

Common types of tolerance include:

- Bilateral tolerance: Symmetrical deviation around the base size.

- Unilateral tolerance: Deviation only in one direction.

- Interference tolerance: Ensures a tight fit between the mating parts.

Understanding and correctly applying the components in the detailed drawing not only helps the product manufacturing process go smoothly but also ensures quality, aesthetics and competitiveness in the market.

Why is it necessary to equip yourself with knowledge of technical drawings?

In the era of rapid economic, social, and technological development, knowledge of technical drawings has become an important factor, not only in production but also in daily life. Here are the reasons why you need to equip yourself with this skill:

Technical drawings are an important way of exchanging information between designers, manufacturers, and consumers. They help to accurately convey design ideas, ensuring that manufactured products meet standards and specifications.

Learning and using technical drawings not only enhances geometric imagination but also promotes logical thinking, supporting other scientific and technical subjects. This subject has been taught for a long time, providing an important foundation for future professions.

In the field of engineering, drawings are a tool to ensure accuracy in production and fabrication of details. It helps to avoid errors, optimize processes and meet increasingly high requirements for product quality.

Sequence of reading detailed drawings

Reading detailed drawings requires skills and professional understanding, especially for beginners. Below is a sequence of steps to read detailed drawings in an easy-to-understand and effective way:

To understand detailed drawings, you need to perform 5 basic steps:

Step 1: Read the content in the title block, including:

• Name of machine part.
• Drawing symbol.
• Manufactured material.
• Drawing scale.

Understanding this information is the premise for accurately interpreting the drawing.

Step 2: Analyze the projections and sections, including side projections, front projections, and section positions to clearly visualize the shape of the part.

Step 3: Determine the general and specific dimensions of each part, including parameters such as diameter, length, and distance between parts.

Step 4: Read technical requirements such as machining instructions, surface treatment, and tolerance standards.

Step 5: Describe the structure, shape, and function of the part based on analysis information from the drawing.

However, reading the drawing is not easy, understanding the drawing is even more difficult. Therefore, to understand it clearly, you need to be a person with extensive professional knowledge and the necessary skills.

For example: Read the drawing of the bushing detail as follows

- Title frame: Need to read the following contents: + Tên gọi chi tiết: Ống lót

+ Detail name: Bushing

+ Material: Steel

+ Scale: 1:1

- Representation:

+ Detail name: Side view

+ Section position: Section in vertical view

- Dimensions: General dimensions of the detail and dimensions of the parts of the detail:

+ 028, 30

+ Outside diameter 028

+ Hole diameter 016

+ Length: 30

- Technical requirements:

+ Processing: blunt edge

+ Surface treatment: Zinc plating

- Summary:

+ Description of shape and structure of the detail: Round cylindrical tube

+ Use of the detail: Used to line between different details.

Step-by-step guide to creating a detailed drawing

To create a complete detailed drawing, you need to perform the following steps:

Step 1: Arrange the representation and title block

- Use the axis lines and contour lines to position the representation.

- Determine the position of the title block on the drawing.

Step 2: Sketch the shape of the detail

- Draw the inside and outside shape of the detail with light lines, including cross-sections, sections, etc.

- Use a pencil or erasable pen for easy editing.

Step 3: Check and edit

- Carefully check the entire drawing, ensure the technical parameters are correct.

- Correct errors, then highlight the lines.

Step 4: Note and complete

- Fill in all information such as dimensions, technical requirements, and content in the title block.

Detailed drawings are a common type of mechanical drawing, requiring precision and understanding of each component. Regular practice of setting up and reading drawings will help you improve your skills and optimize your working time. Above is an overview of detailed drawing rotation information compiled by Intech Group experts. Applying this knowledge in the design of conveyors, conveyor belts and smart warehouses will bring outstanding benefits proven in practice. For more information, please contact hotline: 0983 113 387 - 0966 966 032 for 24/7 consultation and support

See more:

What is CAD/CAM/CNC technology?

What is a technical drawing?