Guide to Mechanical Design for a Quality Project
Guide to Mechanical Design for a Quality Project
Mechanical design is the beating heart of any industrial product.
Whether it’s a precision component destined for an Oil & Gas plant or a pressure vessel that will operate under extreme conditions, the quality of a mechanical design is determined long before the first chip falls on the machine tool.
It is decided on paper — or rather, “on screen” — through a structured, rigorous, and multidisciplinary process.
This guide covers the fundamental principles of mechanical design: from operational phases to reference standards, through to the software tools every design engineer should know.
What Is Mechanical Design and What Are Its Key Elements?
Mechanical design is the process through which the shape, structure, materials, and functional behavior of a mechanical component or system are defined. The objective is not simply to create something that works, but to create something that operates reliably, safely, can be manufactured efficiently, and remains maintainable over time.
A quality mechanical design rests on a number of indispensable elements: a clear understanding of functional requirements, well-reasoned material selection, tolerance control, structural verification, and consistency with manufacturing constraints.
In more demanding industrial contexts, these are complemented by compliance with international standards and regulations that define the boundaries within which the design must operate.
Mechanical design is not a siloed activity: it is in constant dialogue with manufacturing, quality, procurement, and — increasingly — electrical and software engineering, in an integrated approach that reduces risk and accelerates time-to-market.
What Are the Phases of Mechanical Design?
The phases of mechanical design follow a logical progression that transforms a need into a validated product. Shortcutting or skipping them is one of the most costly mistakes a technical office can make.
- Requirements analysis: this is the starting point of any serious project. Operating conditions, expected loads, geometric constraints, customer specifications, and regulatory limits are all defined here. An incomplete analysis at this stage will be paid for with expensive revisions in the phases that follow.
- Conceptual and preliminary development: design alternatives are generated, evaluated on technical and economic grounds, and the most suitable solution is selected. This is the most creative phase, but also the one where decisions with the most significant impact on the entire product lifecycle are made.
- Detail design: geometries, tolerances, materials, surface treatments, and the bill of materials are defined. The technical drawings produced at this stage serve as the contractual document with manufacturing.
- Prototyping and simulation: before physical construction begins, FEM simulation allows structural integrity to be verified, critical areas to be identified, and the design to be optimized without the cost of a physical prototype. Once a prototype is built, the process moves into experimental testing and validation.
- Validation and release: the product is verified against the initial requirements, non-conformities are addressed, and technical documentation is consolidated for handover to production.
Reference Standards and Regulations in Mechanical Design
Mechanical design regulations are not a bureaucratic obstacle: they are the shared language that guarantees product safety and market acceptance worldwide. Ignoring them or treating them superficially exposes a company to legal risk, certification delays, and, in the worst case, non-compliant products that put people at risk.
Key references that every mechanical design engineer must be familiar with include:
- PED Directive 2014/68/EU (Pressure Equipment Directive): mandatory for pressure vessels and pipework intended for the European market, it defines essential safety requirements and conformity assessment procedures.
- ASME Standards (American Society of Mechanical Engineers): an essential reference for access to North American markets and for Oil & Gas applications globally, with dedicated sections covering pressure vessels, piping, and welding.
- UNI/ISO Standards: covering dimensional tolerances, surface finishes, materials, testing, and calculation methods, they form the technical foundation on which any professional technical drawing is built.
- Machinery Directive 2006/42/EC (currently being updated with Machinery Regulation 2023/1230, which will become mandatory from 20 January 2027): defines essential safety requirements for machinery placed on the European market, with direct implications for the design of mechanical systems and sub-systems.
Operating in certified environments — as we do at Baglioni — means these mechanical design regulations are not optional: they are the starting point of every project.
The Best CAD Programs and Tools for Mechanical Design
Choosing the right CAD software is one of the most strategic decisions a technical office can make. It is not merely a matter of personal preference: it affects model quality, team collaboration, and the ability to integrate with downstream design systems.
The leading tools used in professional mechanical design include:
- SolidWorks is arguably the most widely used software among Italian and European industrial SMEs: intuitive, powerful, and equipped with an integrated simulation ecosystem (SolidWorks Simulation) that makes it suitable for a broad range of applications.
- CATIA (Dassault Systèmes) is the benchmark in the automotive and aerospace sectors, where managing complex assemblies and collaborating on large digital models are non-negotiable requirements.
- Creo (PTC) stands out for its advanced parametric design capabilities and its robust integration with PLM tools, making it particularly well-suited to environments with intensive revision cycles.
- Autodesk Inventor is valued for its accessible learning curve and its natural integration with the Autodesk ecosystem, including AutoCAD for 2D drafting.
On the simulation front, tools such as ANSYS and Abaqus represent the state of the art in advanced FEM analysis — indispensable when safety margins are tight and the loads involved are significant.
An increasingly relevant consideration is interoperability between MCAD and ECAD systems: in complex projects, mechanical and electrical design must communicate efficiently to avoid physical interferences, manage cable routing, and ensure the overall coherence of the digital model. Formats such as STEP and IGES, together with PLM platforms, are the tools on which this integration depends.
Baglioni Partners with the Politecnico di Milano and Politecnico di Torino
Mechanical design can be learned from textbooks, but it is only truly understood when you engage with a real problem — with the constraints of an actual project and the questions that only arise from working inside a technical office.
This is why we chose to bring Baglioni directly into the lecture halls of the Politecnico di Milano and Politecnico di Torino.
The initiatives we have developed with these universities over time operate on several levels:
- Lectures and tech talks, in which our engineers present real-world cases in the design and certification of pressure vessels, demonstrating how international standards — from PED to ASME — translate into concrete design decisions.
- Company visits, which allow students to see first-hand the products, manufacturing processes, and organization of an industrial group with a global presence.
- Career Service events, such as the one organized by PoliMI in 2023, where direct engagement with students highlighted the strong interest in industrial automation and pressure systems.
- With the Politecnico di Torino, in 2024 we also organized two dedicated sessions on the design and certification of pressure vessels — covering topics that rarely find space in traditional academic programmes.
During our sessions with students, we always make a point of exploring a theme that is central to our work: mechanical design cannot be separated from mechanical calculation and structural verification.
At our company, the design engineer does not stop at CAD modelling — they must be able to interpret real loads, constraints, and operating conditions, translating them into solutions that are reliable, safe, and certifiable.
Alongside technical skills, we firmly believe in people’s attitude. Proactivity, curiosity, listening skills, initiative, and a willingness to challenge oneself are qualities that, in day-to-day work, make it possible to approach complex projects with an open mindset and a commitment to continuous improvement.
We believe the future of mechanical design is also built this way: through the sharing of expertise, the drive to explain why certain choices are made, and the ability to recognize talent when you encounter it.
Are you a student or recent graduate looking to build a career in this field?
