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Tooling a multi-part blood separator
A separator assembly where several moulded parts had to fit each other, which made the tools a set rather than four independent projects.
The assembly had multiple moulded components that seal and locate against each other. Tooling them as independent projects would have meant each part hitting its own drawing tolerance while the stack-up of all of them still failed.
The tools were therefore designed as a set, with the fits between parts treated as the controlling dimensions rather than the individual features. Sampling was done on assembled sets, not on loose components.
That approach costs more at the design stage and removes the most expensive failure mode in multi-part moulded assemblies: four parts that each pass inspection and do not work together.
Specifications
| Challenge | Several moulded parts sealing and locating against each other |
|---|---|
| Approach | Tools designed as a set, fits treated as controlling dimensions |
| Sampling | On assembled sets rather than loose parts |
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