How Should Engineers Design for Manufacturability?

A component can look perfectly straightforward on a CAD drawing and become considerably more complicated once it reaches the workshop.

Designing for manufacturability means considering how a component will actually be produced while it is still being designed. Small decisions involving tolerances, materials, threads and surface finishes can affect machining time, tooling requirements, inspection and ultimately the cost of the finished part.

For engineers working with bespoke components, these considerations become particularly important when parts need to perform reliably in demanding environments.

 

Why Should Manufacturing Be Considered During the Design Stage?

Problems are much easier to address before production begins. For example, specifying a very tight tolerance across every dimension may appear to improve precision. However, each tighter tolerance can require additional machining and inspection.
If only one particular surface controls how the component fits into an assembly, applying the same tolerance everywhere may add time without improving performance.

Early conversations with our manufacturers can identify these issues before drawings are finalised.

This is particularly useful for high performance fasteners, where dimensions, material properties, and the intended operating conditions all need to work together. Canmec manufactures bespoke fasteners from customer drawings as well as producing components to recognised standards such as DIN, ASTM and BS.

 

How Do Tolerances Affect Manufacturing Cost?

Every manufactured component needs acceptable limits within which its dimensions can vary. The difficulty begins when tolerances are tighter than the application genuinely requires. Achieving them may involve slower machining, additional operations or more detailed inspection.

Consider a bolt with a specially machined shoulder. If that shoulder locates precisely within another component, its diameter may require close control. The overall length of the same bolt might have considerably more freedom.

Identifying which dimensions are genuinely critical allows the manufacturer to concentrate precision where it matters.

For high performance bolts, this can also help ensure that the manufacturing specification reflects the stresses the component will experience rather than adding unnecessary complexity to unrelated features.

 

Why Does Material Selection Affect Manufacturability?

Material selection impacts project success, but is often driven by strength, temperature, corrosion resistance, and the environment in which the component will operate. It also affects how easily the part can be manufactured.

Some high-strength or corrosion-resistant alloys are harder to machine and may wear cutting tools more quickly. Others may require specialist heat treatment or finishing after machining.

This does not mean those materials should be avoided. Where the operating environment demands them, their properties may be essential. The important step is identifying the requirement early enough for the manufacturing process to be planned around it.

Canmec produces custom bolts and fasteners in materials including stainless steels, high-tensile alloys, and corrosion-resistant grades for demanding industrial applications.

 

Can Standard Features Make Bespoke Components Easier to Manufacture?

A bespoke component does not necessarily need every feature to be unique. Using established thread forms, standard material sizes, and commonly available tooling where the design allows can simplify manufacturing and future replacement.

A completely unusual thread, for example, may require specialist tooling. If a standard thread provides the required strength and fit, using it can make production more straightforward.

The same principle applies to high-performance fasteners. The component may have a bespoke head, shoulder, or overall length while retaining a recognised thread specification.

 

Why Should Finishes Be Considered Before the Drawing Is Finalised?

Protective coatings and finishes can change the final dimensions and behaviour of a component. Plating adds material to the surface, which may matter where threads or fitted diameters have close tolerances. Some finishes are selected to improve corrosion resistance, while others can affect friction, conductivity or behaviour at high temperatures.

At Canmec, we offer specialist finishes including silver plating for fasteners and machined components where properties such as reduced friction, conductivity and corrosion resistance are required.

For high performance bolts, specifying the finish early helps ensure allowances can be included in machining rather than discovering after treatment that a critical dimension has changed.

 

When Should Engineers Involve the Manufacturer?

Sharing drawings early can help identify machining challenges, material availability, inspection requirements, and features that could be simplified without changing how the component performs.

This becomes particularly valuable for prototypes and small production runs, where one avoidable machining operation can represent a noticeable proportion of the overall cost.

Good manufacturability usually comes from balancing what the component needs to achieve with a realistic understanding of how it will be made.

 

FAQs

What Does Designing for Manufacturability Mean?

It means designing a component while considering the manufacturing processes, materials, tolerances and tooling required to produce it efficiently and reliably.

 

Do Tight Tolerances Always Improve a Component?

No. Tight tolerances are valuable where precise dimensions affect fit or performance, but unnecessary tolerances can increase manufacturing and inspection requirements.

 

When Should Material Selection Be Discussed With a Manufacturer?

Ideally during the design stage, especially where strength, corrosion resistance, temperature or specialist machining requirements are important.

 

Can Bespoke Parts Still Use Standard Features?

Yes. A custom component can often use standard threads, materials or other features while retaining bespoke dimensions where they are actually required.

 

Why Should Surface Finishes Be Specified Early?

Coatings and plating can affect dimensions, friction and corrosion resistance. Specifying them early allows the manufacturing process and tolerances to account for the finished condition of the component.