The Difference Between A Great Design And A Great Product

Design for manufacturability is one of the most important principles in modern engineering, yet it’s often overlooked until production begins.

Every engineer has seen it. A component looks perfect on the CAD model. Every dimension is correct and every feature has been carefully considered. The design meets the specification and performs exactly as intended but then somebody tries to manufacture it and suddenly, questions begin to appear.

The Moment Theory Meets Production

• Can the cutting tool actually reach that internal corner?
• Will the material distort during fabrication?
• Are those tolerances genuinely necessary?
• Could this be produced more efficiently using a different manufacturing process?

These aren’t manufacturing problems. They’re design problems that only become visible during production.

This is exactly what design for manufacturability seeks to prevent. Rather than treating manufacturing as the final stage of product development, it considers how a component will actually be produced from the very beginning.

For organisations working in sectors such as defence, aerospace, industrial engineering and power systems, this approach often determines whether a project progresses smoothly or becomes an expensive exercise in redesign, rework and delay.

Design Doesn’t End At CAD

Modern CAD software allows engineers to design almost anything. Manufacturing doesn’t.

Features that look straightforward on a computer screen may require specialist tooling, multiple machining operations or complex workholding once they reach the shop floor. Something as simple as a deep pocket, a sharp internal corner or an inaccessible fixing point can significantly increase manufacturing time and cost.

This is why experienced engineers think beyond the drawing itself. They consider how the component is cut, held during machining, inspected and how it’s assembled.

Good design is never just about geometry. It’s about ensuring every stage of production can be completed efficiently without compromising quality or performance.

Engineering Insight: The easiest component to manufacture is often the one that was designed with manufacturing in mind.

The Most Expensive Problems Are Often Designed In

Many studies suggest that the majority of a product’s lifetime cost is effectively determined during the design phase, long before the first component reaches production.

A seemingly minor design decision can influence machining time, tooling requirements, inspection methods, assembly complexity and even future maintenance.

Imagine a simple aluminium mounting bracket. On the CAD model, it includes several deep internal pockets, extremely tight tolerances across every surface and sharp internal corners.

None of these features appears particularly problematic. Until manufacturing begins.

Specialist cutting tools become necessary and additional machining operations are introduced. Inspections also take longer, lead times increase and costs start to climb.

Now imagine the same bracket after a conversation between the design engineer and the manufacturing team.

• The internal corners are given practical radii.
• Only critical dimensions retain tight tolerances.
• A pocket depth is reduced slightly without affecting performance.

Nothing changes from the customer’s perspective but everything changes for production.

This is the real value of design for manufacturability. Rather than redesigning parts after problems appear, it removes unnecessary complexity before production ever begins.

Good Design Makes Manufacturing Easier

Design for manufacturability isn’t about limiting creativity. It’s about applying engineering knowledge where it has the greatest impact.

For example, engineers are increasingly looking for opportunities to reduce unnecessary part count. Combining several components into a single manufactured part can remove fasteners, simplify assembly and reduce the number of opportunities for variation.

Material selection is equally important. Choosing materials that suit both the application’s performance requirements and the intended manufacturing process often improves consistency while reducing unnecessary waste. As explored in our previous article on Why Material Selection in Engineering Matters More Than You Think, these early decisions frequently influence every stage of production.

Tolerances also deserve careful consideration. Specifying unnecessarily tight tolerances across an entire component increases machining time, inspection requirements and manufacturing costs. Experienced engineers understand that precision should be applied where it genuinely matters, not everywhere by default.

None of these changes alters the function of the finished product. They simply make it easier to manufacture reliably, consistently and economically.

Design for Manufacturability Starts With Collaboration

One of the biggest misconceptions in engineering is that a design should be completed before manufacturing specialists become involved. In reality, the opposite is often true.

The earlier manufacturing expertise is introduced, the more opportunities there are to simplify production, reduce costs and eliminate unnecessary risk.

A conversation that lasts thirty minutes during the design phase can save weeks during production.

Manufacturing engineers may identify a more suitable material. A machinist might recommend changing a corner radius to improve tool access. A fabrication specialist may suggest splitting a complex assembly into more manageable sections. Even a small adjustment to a hole position or fixing method can make assembly quicker and more repeatable.

For more information on The Difference Between A Great Design And A Great Product talk to PRV Engineering Ltd