Everyone loves a surprise. That unexpected bonus, that bottle of wine from your colleagues for your birthday. But when it comes to outsourcing electronics manufacturing, it’s fair to say you want as few surprises as possible. That’s why you should always ‘Design for Excellence (DfX).
DfX (otherwise known as Design for Excellence) are the systems you use to 'bake' value and quality into products during their design phase.
DfX helps you optimise products for performance, reliability and efficiency as you plan and specify them, rather than having to improve and iterate in post-production.
The ‘X’ stands for excellence, but it also refers to the different elements involved in creating quality products which you can address systematically within the design process. These include DfMA (Design for Manufacturing and Assembly), DfT (Design for Testing), DfQ (Design for Quality), DfP (Design for Procurement), DfE (Design for Environment) and so on.
Famously, 80% of costs are locked into a product at the design phase. In other words, once you’ve started manufacturing there’s not much you can do about any waste you identify later on. And this is a problem, as there’s a lot of waste about in manufacturing. The Lean institute say 95% of process activities associated with manufacturing ultimately add no value to the customer. Meanwhile, HCL Technologies say 70% of the engineering changes which delay production are due to brands trying to retrospectively correct issues with design to deal with assembly, cost & quality problems.
DfX tackles the potential for procurement problems, over-specification and over-processing that can impact quality and make your products uncompetitive.
DfX ensures:
And it does it from the start, as you plan and specify your products - and the way they should be made.
Design for Manufacturing and Assembly (DFMA) is the optimisation of a part, product, or component’s design to create it more cheaply and easily without compromising compliance or expected performance.
DfMA looks to:
A comprehensive test strategy should be developed concurrently with your product design. This approach will result in a cost-effective test process with the best possible test coverage.
DfT ensures you have designed your products so you can test them appropriately.
Successful design for testing requires designating important test points in your PCB design files, which your EMS will then use for a variety of tests.
The testing strategies you choose to deploy will require different design input levels and incur different levels of expenses. You need to optimise your design to ensure the right tests can be conducted to ensure the level of quality you require. These strategies may include:
A DfQ strategy identifies potential product and process failure risks as early as possible to ensure they are ‘designed out’ of the product.
DfQ ensures quality by:
Using a DfQ approach can also prevent you from getting locked into compliant but not necessarily cost-effective designs. If a design has proceeded to the prototype stage and been validated for regulatory compliance, you may be committed to manufacturing a product in a certain way for a lengthy period. It might not make sense to re-submit your design to regulators at that point - so your ROI and customer value could be severely impacted.
DfQ takes a holistic approach so that the best value and quality outcomes for customers are always achieved.
You can usefully factor in procurement and cost control expertise at the design stage, too. Done properly, this will help you focus on balancing cost and quality:
BOM (Bill-of-Material) cost is usually a significant portion of the total product cost, so exploring total cost of materials against quality requirements and considering possible alternatives could save you from expensive redesigns in the post-launch phase.
Ensure best value is always sought: For example, understanding that parts can be purchased at a lower price if you choose a particular colour or material will help the design team select the correct product and save cost.
Avoid using materials/components that are about to become obsolete: OEMs specify a particular chip in their design, which may be about to be phased out or become more difficult to source. Thinking about the availability of materials and components and drawing on supply chain expertise within the procurement team is vital.
Product designs can often have unintended environmental consequences, including:
By bringing expert manufacturing teams into your design process you can ensure, from the outset, you are following best practice laid out in various environmental codes, including these standards and regulations:
A strong DfX team will coordinate efforts internally to ensure nothing is missed in the search for cost and quality control in manufacturing.
Bringing manufacturing expertise into your design process early on (as part of a DfX strategy) will ensure your product will be designed and then built in the most efficient and cost-effective way possible.
It will ensure you don’t waste time transferring unoptimised designs to Electronics Manufacturing Services (EMS) providers, but instead have all the required procurement, tooling, testing and logistics plans in place to shift to an optimised NPI without missing a beat.
Even after a product is launched, there are always opportunities to make improvements. DfX principles can be applied at any stage to reduce manufacturing costs or complexity - while adding value for end users.
During the COVID-19 pandemic, Pfizer's cold chain partner, Controlant, collaborated with ESCATEC on just such a project. Their goal was to reduce the cost and improve the performance of the IoT temperature loggers they were using to monitor the condition and stability of the vaccine in transit.
As Pfizer prepared to roll out billions of vaccines, Controlant was equipping millions of shipping containers with the second generation of these data loggers.
The NPI team at ESCATEC applied DFM (Design for Manufacturing) strategies to isolate multiple enhancements to their designs that accelerated assembly lines and reduced the costs of vaccine delivery around the world.
Traditional engineering approaches often focus on vision and functional requirements first, while future product life-cycle and manufacturability concerns are addressed later on.
Design for Excellence, on the other hand, considers all these aspects as an integral part of the design process, so that the each iteration of your product is as efficient, cost-effective, easy to assemble and future-proof as it possibly can be.
If you choose to work with an EMS provider on a DfX strategy it should save you the time, effort and expense of adjusting designs when you meet the hard realities of production. Ultimately, it should prevent you from having to spend time and money re-engineering failing products in the future.