Design changes are still landing after the tools are cut

In a launch review you still hear “engineering signed off.” What they signed off is often a CAD model that has never met a fixture, a tolerance stack that assumes a supplier’s process capability from 2019, and a bill of materials purchasing has already had to rewrite. That gap is a schedule.

The firms that are ahead treat design for manufacture as the product, not as a gate at the end. Generative design and topology optimisation are useful. What actually travels between a plant in Penang and a plant in Ohio is one definition of the part: geometry, material, process and inspection, without a week of phone calls to fill the gaps.

First article is a management system

A first-article inspection is supposed to prove that the process, not the hero technician, can make the part. In too many organisations it is a PDF ritual. The plants that are actually fast have folded FAI into the digital thread: the same characteristic the designer dimensioned is the characteristic the CMM reports, and the same characteristic the MES will hold the line to. When that loop is closed, engineering change stops being a negotiation and starts being a release.

If the manufacturing engineers first see the product when the tooling is already cut, the file never left the design office.

The cost of a late change has gone up with every second source, every regional plant, and every customer who wants a full PPAP pack in a week. A chamfer is still cheaper on a screen than on a tool that has already been cut.