{"id":29348,"date":"2025-05-08T09:15:00","date_gmt":"2025-05-08T08:15:00","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=29348"},"modified":"2025-05-07T11:18:03","modified_gmt":"2025-05-07T10:18:03","slug":"engineering-at-the-micron-level","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/engineering-at-the-micron-level\/","title":{"rendered":"Engineering at the micron level"},"content":{"rendered":"\n


One thing has become increasingly clear over the years, no matter how advanced the equipment or how skilled the technicians, the long-term success of any micro molded product is determined before the first shot of resin ever hits the mold. It begins with thoughtful, collaborative design which is discussed by Brett Saddoris<\/strong><\/p>\n\n\n\n

In product development, the concept of ‘design for manufacturing’ (DfM) is well established. It is a guiding principle that ensures a product\u2019s geometry, material selection, and feature set are compatible with the realities of manufacturing. But when you scale that concept down to the micro level for plastic parts \u2014 which can weigh less than a fraction of a gram and feature tolerances are measured in microns \u2014 DfM evolves into something far more nuanced \u2014 Design for Micro Molding (DfMM).<\/p>\n\n\n\n

And at this scale, the margin for error is virtually non-existent.<\/p>\n\n\n\n

At Accumold, we\u2019ve spent decades mastering the art and science of micro injection molding. But one thing has become increasingly clear over the years, no matter how advanced the equipment or how skilled the technicians, the long-term success of any micro moulded product is determined before the first shot of resin ever hits the mold. It begins with thoughtful, collaborative design.<\/p>\n\n\n\n

Rethinking design fundamentals for micro scale<\/strong><\/p>\n\n\n\n

DfMM demands that engineers rethink some of the most basic assumptions that apply at the macro scale. Traditional part design strategies \u2014 gate placement, draft angles, parting lines, even wall thickness \u2014 do not translate directly. They must be reinterpreted for a world where a 0.005-in shift can render a feature unusable or make a part unmoldable altogether\u200b.<\/p>\n\n\n\n

For example, gating options at the micro level are drastically reduced. Typical gate diameters might range from 60 to 200 microns\u200b. Ejector pin placement \u2014 an afterthought in many traditional mold designs \u2014 becomes a critical constraint, as pins must be not only tiny (sometimes as small as 0.25mm) but strategically placed to avoid damaging fragile features or interfering with part function.<\/p>\n\n\n\n

Even the choice of materials is not as simple as it might seem. Engineers often consult datasheets and choose materials that perform well in macro applications \u2014 PEEK, Ultem, LCP, carbon-filled nylons, and others. But many resin data sheets are based on test bars molded in large-scale tools with large gates. That data is often misleading when you are trying to push high-temperature polymers through a 0.1mm gate into a micro-scale cavity with extreme aspect ratios\u200b\u200b.<\/p>\n\n\n\n

That is where true DfMM begins \u2014 with deep, early collaboration between designers and micro molding experts.<\/p>\n\n\n\n

The case for early engagement<\/strong><\/p>\n\n\n\n

If there is one universal truth in micro molding, it\u2019s this. The earlier the micro moulder is brought into the product development conversation, the better the results will be.<\/p>\n\n\n\n

At Accumold, we often say we are not just manufacturers \u2014 we are consultants. We do not just build tools and run parts; we partner with design teams to guide them through the micro manufacturing process, from CAD file to finished, validated part. That partnership starts with candid, pragmatic design reviews that assess part feasibility, material compatibility, mouldability, and downstream processing implications like assembly and inspection\u200b\u200b.<\/p>\n\n\n\n

Designs can \u2014 and should \u2014 be challenged at this stage. Sometimes, we will work with customers who are convinced their design is un-moldable. But with a few subtle changes to wall thickness, draft, or gating, we can turn a problematic concept into a manufacturable part. Other times, we will encounter features that are simply impossible to mould or measure. In those cases, early engagement allows us to recommend changes before they cascade into tooling rework or program delays.<\/p>\n\n\n\n

This design-stage collaboration is not just useful \u2014 it is mission critical.<\/p>\n\n\n\n

DFMM as a risk mitigation strategy<\/strong><\/p>\n\n\n\n

From the outside, it can be easy to underestimate just how much risk is embedded in micro-scale product development. The parts may be small, but the stakes are large \u2014 especially for medical, aerospace, and microelectronics applications where failure is not an option.<\/p>\n\n\n\n

Each stage of development \u2014 from part design and tooling, to moulding, validation, and metrology \u2014 can introduce variability that jeopardises the success of the project. One of the best ways to mitigate those risks is through comprehensive DfMM that bakes in quality from the start\u200b.<\/p>\n\n\n\n

Consider tooling. A micro moulding tool is not a scaled-down version of a conventional mold. It is an entirely different engineering challenge. Core pins, for example, can be thinner than a human hair and must withstand extreme pressures without deflecting. Without precision tooling \u2014 fabricated in-house under tight control \u2014 even the best part design cannot be realised with any consistency\u200b.<\/p>\n\n\n\n

Or take measurement. In many cases, the features we mold are too small to be measured with conventional tools. Validating parts at this level requires specialised metrology equipment and techniques that must be planned for at the design stage. If the part is not designed to be measurable, it is not manufacturable \u2014 at least not in a way that instills confidence.<\/p>\n\n\n\n

Beyond the part<\/strong><\/p>\n\n\n\n

It is also important to recognise that DfMM does not end with geometry and material selection. It extends to the moulding process, automation strategies, and even the people involved in the project.<\/p>\n\n\n\n

Scaling a part from prototype to production is not a plug-and-play exercise. At micro scale, the smallest process variations \u2014 residence time, melt temperature, injection velocity \u2014 can influence shrinkage, flash, or parting line mismatch. If the design hasn\u2019t accounted for these sensitivities, problems emerge when volumes ramp up\u200b.<\/p>\n\n\n\n

That is why vertical integration matters so much in micro molding. At Accumold, our engineers, toolmakers, quality specialists, and automation experts work under the same roof, in constant collaboration. This allows us to test, refine, and perfect the process early \u2014 not after a program is already in crisis.<\/p>\n\n\n\n

And it enables us to take projects from single-cavity prototype tools to 16- or 32-cavity production molds that run millions \u2014 or even billions \u2014 of parts per year, all while maintaining tight quality controls\u200b.<\/p>\n\n\n\n

If you are developing a product that will rely on micro injection molding, the message is clear, DfMM is not optional. It is the foundation upon which your program\u2019s success will rest.<\/p>\n\n\n\n

The most sophisticated mould designs, the most advanced moulding presses, the cleanest cleanroom \u2014 none of these assets can compensate for a flawed design that wasn\u2019t engineered for micro manufacturing from the outset.<\/p>\n\n\n\n

That is why partner selection is so important. When evaluating a micro molder, do not just ask about press size or ISO certifications. Ask about their ability to support DfMM. Do they have in-house toolmakers? Can they simulate flow and optimise part design? Can they validate, automate, and scale? Do they see themselves as a partner \u2014 or just a vendor?<\/p>\n\n\n\n

At Accumold, we believe the answer should be clear. Because in this business, success is not measured in parts molded. It is measured in parts delivered \u2014 consistently, cost-effectively, and with the confidence that they will perform exactly as designed.<\/p>\n\n\n\n

So, if your next innovation hinges on micro moulding, remember: do not just design for function. Design for micro manufacturing. The difference may be measured in microns \u2014 but its impact is enormous.<\/p>\n\n\n\n

Brett Saddoris is Technical Marketing Manager at Accumold<\/a><\/strong>.\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

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