From Prototype to Production: What Changes and What Should Not

A common frustration for hardware teams: the production parts do not quite match the prototypes. Understanding what changes between prototype and production — and what must not — helps you prevent that.

In prototyping, speed dominates. Parts may be made with general-purpose setups and inspected individually. In production, repeatability dominates: fixturing, process planning, and inspection sampling are designed so part five hundred matches part five.

What should change: process planning, fixturing, batching, and inspection strategy all mature for production. Value engineering input is most valuable at this transition, when small design adjustments can reduce cost for the life of the program.

What should not change: the part's function-critical dimensions, materials, and finishes. A first-article inspection at the start of production formally verifies that the production process produces parts matching the drawing — before the full release runs.

Working with one manufacturer from prototype through production removes the riskiest step: transferring knowledge between suppliers. The lessons learned in prototyping carry directly into production planning.