Q&A: What Is Engineering Drawing and Why Is It Important?

An isometric drawing is how the object in figure 2 is depicted. This is one of a group of pictorial drawings, which are three-dimensional views. In an isometric drawing, the width and depth planes’ horizontal lines are shown at an angle of 30 degrees to the horizontal, and the object’s vertical lines are drawn vertically. The lines parallel to these three axes drawn in accordance with these rules are at their true (scale) lengths. Lines won’t be their true length if they are not parallel to these axes.

A complete understanding of the object should be possible from the drawing, which is a requirement for any engineering drawing. It is ideal if the isometric drawing can display all information and dimensions on a single drawing. An isometric drawing can contain a lot of information. However, using just one isometric drawing wouldn’t be able to show the hole if the object in figure 2 had one. An orthographic projection may be used to provide a more thorough view of the object.

Intro to Mechanical Engineering Drawing

Why do engineers need to know how to draw?

To accurately communicate building instructions to the manufacturing department, keep track of what they create, and submit patent applications for new inventions, engineers must be able to draw the products they work on. Technical drawings, prints, blueprints, and schematics are other names for engineering drawings. Previously, engineers would create these drawings by hand; today, they do so using CAD software.

Numerous businesses have drafting departments that produce the drawings using specialized software because the majority of CAD software is extremely detailed and industry-specific. Engineers then take these drafts and correct or modify them. These departments typically employ technicians or drafters who have advanced knowledge of CAD software and related systems. Drafting technicians may focus on mechanical, architectural, or civil engineering drawings as well as electrical or electronic drawings.

What is the purpose of drawing in engineering?

Technical illustrations convey crucial information about how to construct or repair something. The engineer gives these drawings to the assembly department to put the parts together, to the manufacturing department to make the parts, and finally to any vendors, archives, or other company departments. The drawings may show the geometry, dimensions, tolerances, functions, finish, hardware, and material of an object or system. Electronic drawings might include which connections to wire or weld. Information about how a system or structure interacts with the topography may be included in architectural or civil engineering drawings.

Drawings also give businesses a great deal of information about how to manufacture a product, such as which components need to be accurate and how much room there is for error overall. Engineering drawings must adhere to certain international conventions in order for engineering professionals to understand the information being conveyed.

What is a projection on a technical drawing?

The projection lets an engineer depict a three-dimensional object on a two-dimensional drawing by describing the angle from which the drawing looks at the object. Different projections are sometimes used in technical drawings to show more detail on a particular side or area, how an object is put together in three dimensions, or to show a cutaway view inside an assembly or building. In order to correctly read the information on a drawing, it’s critical to understand what projection it employs. Here are some common projections used for technical drawings:


The drawing’s bottom left side appears to face the viewer due to the object being presented in an oblique manner. Instead of making the further edges appear shorter than they would in person, this projection shows all lines to scale. This can distort the appearance of an oblique projection.


In an isometric projection, an object is presented at an angle with all of its visible sides facing the viewer. For additional technical insight into a product’s dimensions, these drawings also include all lines drawn at scale. Isometric projections, however, may also deform the appearance in digital form, much like oblique projections.

Multi-view or orthographic

An orthographic projection shows an object from all six directions. The orthographic projection displays what each side of a cube would look like if the object were inside of one. The first and third orthographic projection conventions offer two different arrangements for the side views. The first projection is more frequently applied in international applications, while the third projection is the norm for the majority of uses in the United States.

What are the components of a technical drawing?

Depending on the industry, the component, and the purpose of the drawing, technical drawings may contain a variety of components. These are some components a drawing can have:

How do engineers create technical drawings?

To design and create plans for a variety of applications, including individual parts, buildings, plumbing systems, and electrical systems, engineers and technicians use computer automated design (CAD) software. The actions that come after give you more information about how professionals use engineering drawings:

1. Plan the project

An engineer or draftsman interacts with design teams and gathers all required planning documents before engineers produce technical drawings and blueprints in a CAD program. Before starting, they do extensive research to make sure they are familiar with all the requirements and the project’s function. At this stage of the development process, engineers must identify the features of the product and the functions they employ when using function commands in a CAD program.

2. Establish project files

Following the creation of a product design plan, engineers and drafters create a project file in a CAD program and enter the item’s specifications. The project file may contain specifications like size, unit, and language, depending on the type of engineering design. Additionally, project files may contain digital tools and menus that engineers load into the software to complete the project.

3. Create the product

Within the CAD program, engineers work with drafters and other design experts to start the product development process. Engineers keep an eye on the digital design process while the product is being developed to make sure all the dimensions and materials are accurate. Engineers and designers continuously check the software for problems that might have an impact on the project’s outcome.

4. Input technical information

An engineering drawing includes technical details about a design, such as required materials, product specifications, and dimensions, in addition to the views of the object. Technical drawings may also contain company administrative notes, project completion dates, and project revisions. In a CAD program, engineers enter this data in boxes along the side of the drawing so that other engineers, designers, and business executives can check it for accuracy.

5. Develop proofs

Engineers print and send digital copies of their finished technical drawing projects to management and business executives for approval. Technical drawings, also known as proofs, are typically rough prototypes or sketches of a design; however, smaller proofs may include projects that are almost finished. Before final production, engineers send proofs to get feedback that can help them improve the design.

6. Collect feedback

An engineer or drafter, depending on the project, solicits opinions on the project from other engineers, colleagues, and supervisors. They might send the draft to the client for approval for bigger projects. Before building something at scale or starting mass production, engineering professionals may even test a number of its components to ensure that it functions as intended.

7. Revise drawings

The engineer alters the drawing as necessary in response to the comments. Revisions can include changing materials for better function or aesthetics. If managers or clients request changes in specifications, engineers may also make revisions or modifications to dimensions. Engineers may need to revise their designs if there are significant changes to the project’s scope or budget.

What are engineering drawings used for?

Technical drawings can convey plans for a wide range of applications, such as:

Design and development

Drawings aid in the understanding of project developments, outcomes, and functions by engineers, designers, and clients. Drawings can assist engineers and architects in the early stages of a project by showing how various components work together. Drawings can be used to show customers the final product’s appearance during the approval process. The architect or civil engineer may make the drawings available to the public if the project is substantial or publicly funded in order to solicit feedback and promote the endeavor. These drawings assist project managers in estimating the amount of material required for the construction process and in organizing the steps to complete a project.

Manufacturing and assembly

It is now possible to use CAD files to instruct machines to manufacture a product or part thanks to advances in software and manufacturing technology. This process is computer-aided manufacturing. Since technicians don’t have to manually input the information from the drawings into the machines, the manufacturing process is significantly faster than it would be with paper drawings.

Through computer numerical control, the drawing informs the machine of the product’s dimensions and material. Drawings can assist people in comprehending how to install systems, construct buildings, and put together machines from smaller parts. They can help people who speak different languages understand the same information and can be more effective than written instructions.

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