Cost-Driven Design Exploration for a Pharmaceutical Rotary Filler Link Family

The Part

A titanium nozzle actuation link from a high-speed rotary liquid filler, coupling a servo-driven cam to a reciprocating nozzle carrier for precise volumetric dosing. The component cycles at 2 to 3 Hz over service lives exceeding 10^8 cycles, in a GMP environment requiring full CIP/SIP chemical resistance. Ti-6Al-4V was the only material satisfying both very-high-cycle fatigue performance and cleanability requirements simultaneously.

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The Challenge

The legacy design was structurally sound. The pressure driving redesign came from two directions.

Procurement needed the cost-optimal manufacturing route validated at concept stage, before any tooling commitment. At the same time, the OEM's customers increasingly track reciprocating moving mass as a TCO and ESG metric, given its direct relationship to lifetime servo energy draw.

A third constraint compounded both: the same link topology covers 16 variants across 4 machine platforms and 4 nozzle configurations, and redesigning each variant independently was accumulating 32 weeks of engineering lead time per family cycle.

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The Approach

The engineering team evaluated three manufacturing routes simultaneously at concept stage, with manufacturing constraints, structural validation, and cost modeling running in parallel rather than in sequence. The route selection outcome was not the one procurement initially anticipated.

The case study details the full multi-process exploration setup, the cost model logic that drove the final route decision, and the workflow architecture that makes the remaining 15 family variants regenerate in a fraction of the original lead time.

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Key Results

• -12% recurring cost per part, manufacturing route confirmed at concept stage
• -14% moving mass, with a stronger safety factor than the legacy design
• 4x faster full-family engineering lead time, across 16 variants

The case study includes the complete before/after metrics table, FEA validation data, and NRC amortization breakdown.

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Why It Matters

This project illustrates what changes when cost, performance, and manufacturability are evaluated together at concept stage, rather than sequentially after geometry is already fixed. The implications extend beyond this specific part family.

Download the case study to see the full workflow, route selection logic, and results breakdown.