Engineering involves applying scientific and mathematical principles to invent, design, build, and improve structures, machines, and systems. Mechanical engineering specifically applies these principles to the design, analysis, manufacturing, and maintenance of mechanical systems. Design engineers are involved in various disciplines and work to research user needs, sketch ideas, develop virtual models, and more. Their work includes machine design, product design, industrial design, and mechanical CAD drawings.

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Engineering?
Engineering is the application of mathematics and scientific, economic, social,
and practical knowledge in order to invent, innovate, design, build, maintain,
research, and improve structures, machines, tools, systems, components,
materials, processes, solutions, and organizations.
Design in Mechanical Engineering?
Mechanical engineering is the discipline that applies the principles of
engineering, physics, and materials science for the design, analysis,
manufacturing, and maintenance of mechanical systems. It is the branch of
engineering that involves the design, production, and operation of machinery.
Design Engineer
A design engineer is a general term for a person who may be involved in any of
various engineering disciplines including electrical, mechanical, chemical,
textiles, aerospace, nuclear, manufacturing, civil, systems, and structural
/building/architectural.
What do you do as a design engineer?
Design engineers, also known as industrial designers, typically do the
following: Research who will use the product and the various ways it might be
used. Sketch out ideas or create blueprints. Use computer software to develop
virtual models of different designs.
Machine Design
Machine design is the process of engineering design. A machine is made up of
mechanisms that work together to satisfy the requirements of what the
machine needs to accomplish.
Mechanical Design Engineer
Mechanical engineers are typically involved with the generation, distribution,
and use of energy; the processing of materials; the control and automation of
manufacturing systems; the design and development of machines; and the
solutions to environmental problems.

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Product
Products change functionally and aesthetically, hence the key ingredient for
any product's success is the skill of the Product Design Engineers. Product
Design Engineers have the challenging task of combining creative, aesthetic
and technical design skills, with a background of engineering science.
Product Design
Product design as a verb is to create a new product to be sold by a business to
its customers. A very broad concept, it is essentially the efficient and effective
generation and development of ideas through a process that leads to new
products.
Industrial Design
Industrial design is a process of design applied to products that are to be
manufactured through techniques of mass production.
Work of Industrial Designers
Industrial designers work primarily in offices, but they may travel to the places
where the products are manufactured. Industrial designers develop the
concepts for manufactured products, such as cars, home appliances, and toys.
They combine art, business, and engineering to make products that people use
every day.
Product Engineering
Product engineering refers to the process of designing and developing a device,
assembly, or system such that it be produced as an item for sale through some
production manufacturing process. ... It includes design, development and
transitioning to manufacturing of the product.
Mechanical CAD
In mechanical design it is known as mechanical design automation (MDA) or
computer-aided drafting (CAD), which includes the process of creating a
technical drawing with the use of computer software.
Machine Drawing
In Machine drawing is the indispensable communicating medium employed in
industries, to furnish all the information required for the manufacture and
assembly of the components of a machine.

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CAD
CAD, or computer-aided design and drafting (CADD), is the use of computer
technology for design and design documentation. CAD software replaces
manual drafting with an automated process.
CAD Drawings
CAD (computer-aided design) software is used by architects, engineers,
drafters, artists, and others to create precision drawings or technical
illustrations. CAD software can be used to create two-dimensional (2-D)
drawings or three-dimensional (3-D) models.
Production Drawings
Production drawings (sometimes called working drawings) are complete sets
of drawings that detail the manufacturing and assembly of products (as distinct
from engineering drawings prepared by and/or for production engineers
whose task it to decide how best to manufacture the products).
Assembly drawings
An assembly drawing shows how parts of a product fit together. They are often
used to show how to assemble parts of model kits and flat-pack furniture.
An assembly drawing is a technical drawing that uses action illustrations to
show how parts fit together. Multiple drawings are used together in sequential
sets to give a reader instruction on how a product is assembled.
There are two types:
A fitted assembly drawing shows the parts put together, and can be drawn in
2D or 3D.
An exploded drawing shows the parts separated, but in the correct
relationship for fitting together. Exploded views are usually drawn in 3D.
Cutaway drawing
A cutaway drawing, also called a cutaway diagram is a 3D graphics, drawing,
diagram and or illustration, in which surface elements of a three-dimensional
model are selectively removed, to make internal features visible, but without
sacrificing the outer context entirely.