Design for automated manufacturing: what changes?
Within the first design review, we identified six features that could be optimized before automation could reliably build it. This isn’t unusual. Products designed for manual assembly and products designed for automated systems operate under different constraints. The gap isn’t always obvious until you examine how each approach interacts with parts.
Understanding Different Capabilities
Both manual and automated assembly have distinct strengths and limitations that affect manufacturing outcomes. The question isn’t whether one approach is superior, but rather which capabilities best match your manufacturing requirements.
Manual assembly limitations include:
- Difficulty manipulating parts smaller than 1-2mm reliably
- Microscopic handling tasks that require specialized skills, often limited to a subset of operators
- Inherent variability in force application, alignment, and reproducibility between individuals and shifts
- Fatigue during small, precise operations that cannot be sustained over extended periods
- Susceptibility to contamination and restrictions in challenging environments (extreme temperatures, chemical exposure, laser operations)
Automated systems offer complementary capabilities:
- Consistent handling of tiny components with repeatable precision
- Precise force application through torque and force control
- Operation in conditions unsuitable for human workers
- Sustained performance without degradation over time
- Achievement of precision levels difficult to maintain manually
Part Orientation and Presentation
Manual assembly relies on visual and tactile feedback for part orientation. Automated systems require either consistent part presentation or vision systems capable of identifying and correcting orientation. For complex geometries, particularly asymmetric parts smaller than 5mm, this presents engineering challenges.
Design features that enable consistent part presentation include datum surfaces, asymmetric geometry that prevents incorrect orientation, and features that naturally nest parts in the correct position. These considerations simplify both manual and automated processes, though they’re essential rather than optional for automation.
“We’ve worked with customers who modified material specifications or added surface treatments to enable reliable automated handling, then validated those changes through their full regulatory process.”
Material Selection in Automated Handling
Material properties affect automated handling in specific ways. Flexible materials may deform unpredictably under automated grippers. Materials generating static charge can cause parts to adhere to tooling or each other. Surface finishes affect friction coefficients, determining how reliably grippers maintain part control through acceleration and deceleration.
These factors directly impact yield. We’ve worked with customers who modified material specifications or added surface treatments to enable reliable automated handling, then validated those changes through their full regulatory process.
Fastening Strategy Considerations
Assembly methods suitable for manual processes may require adaptation for automation. Tiny screws, for instance, demand precision tooling, torque control, and reliable thread engagement in automated systems while maintaining positional accuracy.
“Organizations that treat automation as a post-design challenge face choices between costly redesign and acceptance of constrained automation performance.”
Alternative approaches that work well in automation include snap fits with specific engagement angles, interference fits with controlled press forces, or adhesive bonding with precise dispensing. The functional requirements remain the same; the assembly method shifts to leverage each system’s strengths. For Class III devices where every joint is critical, this typically requires extensive testing to validate that alternative assembly methods meet the same strength and reliability standards.
Integration Timing Matters
Companies that integrate automation considerations during initial product development build devices that are efficiently manufacturable at scale with validated processes. Organizations that treat automation as a post-design challenge face choices between costly redesign and acceptance of constrained automation performance. For complex devices where design changes trigger extensive revalidation, timing matters significantly.
Design for automated manufacturing recognizes that reliable, high-volume production of life-critical devices benefits from manufacturing considerations influencing design from the beginning. Review your product design through an automation lens. What would need to change? Sometimes the answer is “very little”, but discovering this early provides more options than learning it when you’re already committed to scaling.
Is your product ready for automated precision manufacturing? Bas is ready to take your project steps ahead.
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