A good prototype is built to learn. It answers the important questions quickly: does the idea work, is the architecture sound, and can we get the performance we need? That usually means accepting things you wouldn’t accept in production. Parts may be machined instead of molded. Assemblies may be built by the engineers who designed […]
A good prototype is built to learn. It answers the important questions quickly: does the idea work, is the architecture sound, and can we get the performance we need?
That usually means accepting things you wouldn’t accept in production. Parts may be machined instead of molded. Assemblies may be built by the engineers who designed them. Test procedures may be informal. Components may have been selected because they were available in quantities of ten, not a thousand.
That’s fine. The prototype did its job.
The mistake is assuming that once the prototype works, most of the engineering is finished. Moving from prototype to production requires both the product and the process used to build it to mature.
Manufacturability shouldn’t first appear as a DFM review after the design is finished.
Manufacturing process, assembly, sourcing, testability and expected production volume all affect engineering decisions. An enclosure designed for machining is different from one designed for molding. A circuit board that works perfectly may still be difficult to assemble or test. A tolerance that’s easy to hit on a prototype machine may add unnecessary cost or scrap in production.
That doesn’t mean treating an early prototype like a production unit. Early development should move quickly, and some decisions are better left open while the team is still learning.
What matters is having people involved who understand the downstream consequences. As the design matures, the level of rigor increases and more of those decisions get locked down. That is how we approach DFM services: manufacturing input that starts early and gets more detailed as the design settles.
As the design settles down, informal decisions need to become deliberate ones.
Materials and processes move toward production intent. The bill of materials has to work at the quantities being purchased, with lead times, availability and supplier risk understood. Assembly needs to work without relying on the engineer who designed the product knowing all of its quirks.
Test changes too. During development, testing is mostly about learning whether the design works. In production, it also has to determine efficiently whether each unit was built correctly. Fixtures, test software, acceptance limits and traceability become part of the production system.
Tooling and documentation mature along with the product. Tolerances get tied to measured process capability. Work instructions replace tribal knowledge. Fixtures make difficult or variable operations repeatable.
Eventually the design is stable enough to commit to production. But that doesn’t mean the learning is finished. (For the most common pitfalls along the way, see our guide to the expensive mistakes teams make going from prototype to production.)
The first production builds expose things that prototypes rarely do.
Assembly time stops being an estimate. Supplier variation shows up. Operators find awkward assembly steps. Yield becomes measurable. Test coverage gets challenged. Fixtures that worked well for a handful of units get used over and over.
Keeping engineering close to manufacturing makes those lessons easier to act on.
A problem found during a build might require a design change. Or the right answer might be a fixture, a supplier correction, a different assembly sequence or a better test. When the people who understand the design are still involved, the team can make that distinction quickly without reconstructing months of engineering history.
That is the strongest argument for building early production close to the engineering team. It’s also why we keep low- and mid-rate production in-house: the feedback loop between engineering and manufacturing stays short while both the product and the production process continue to improve.
For many products, that’s also where they should stay.
Specialized equipment and complex products serving focused markets may spend their entire lives at low or middle production rates. Those products still change. Components become obsolete, suppliers change, costs need attention and field experience leads to improvements. (We cover this stage in more depth in our piece on small-scale manufacturing.)
Keeping engineering connected to manufacturing stays useful long after the initial launch.
Some products eventually reach volumes where a larger contract manufacturer is the better place to build them. High-rate factories have equipment, supply chains, purchasing leverage and automation that don’t necessarily make sense at lower volumes.
Moving production at that point sounds straightforward. It often isn’t.
Different contract manufacturers can propose substantially different ways of building the same product. Their assumptions about tooling, labor, automation, inspection, test coverage, yield, rework and process control aren’t always easy to see in a quotation. Two similar piece prices can represent two different production systems.
Those differences are especially painful to discover after tooling is committed and production is ramping.
Having already manufactured the product gives us something concrete to work from. We know where the difficult assembly steps are. Labor and yield data come from units already built, and we know which tolerances matter, where supplier variation causes problems and what needs to be tested.
That gives the customer a much better basis for evaluating how a contract manufacturer proposes to build the product. Instead of comparing quotes in isolation, we can compare the proposed manufacturing approach with a process that has already produced shipping units.
A high-rate manufacturer shouldn’t necessarily copy our process step for step. Different equipment, volumes and economics will drive different choices. What matters is understanding those changes before committing to them.
Once a contract manufacturer is selected, we can stay involved through the transfer and ramp. The new manufacturer gets the benefit of what has already been learned instead of having to rediscover it while production is coming up to speed.
Treetown Tech was built to keep engineering and manufacturing connected through the life of a product. We may join while the architecture is still being developed, inherit a working prototype that needs more hardware product development, help a product that’s struggling to get into production, or take over manufacturing of something already built elsewhere. Products that stay at low or middle rates can stay with us for manufacturing and ongoing engineering changes. Products that outgrow that range get our help moving to a high-rate factory.
The manufacturing knowledge stays with the product, wherever it’s built.
By maturing the product and the process used to build it together. Materials and processes move to production intent, the bill of materials is sourced at purchase quantities, assembly and test stop depending on the engineers who designed the product, and work instructions replace tribal knowledge. Early production builds then expose assembly time, supplier variation and yield, and the team fixes what they reveal in either the design or the process. Scaling goes best when engineering stays close to manufacturing through that whole stretch.
Early enough to influence decisions that will be expensive to change later. That doesn’t mean applying production-level rigor to an early prototype. It means considering process, assembly, sourcing and testability while the design is still flexible.
Yes, and at low and middle volumes it is often the better arrangement. If the team that engineered a product also builds it, problems found on the line get sorted quickly into design fixes, fixture changes, supplier corrections or test updates. Treetown Tech works this way, building products in-house at low and middle rates and helping move them to a high-rate contract manufacturer if volume later calls for it.
It means the design and production process are mature enough to build the product repeatably at the intended rate and quality. What that requires depends on the product, its risk and its production volume.
When the volume, equipment, supply chain or economics favor a factory built for higher-rate production. Before moving, compare how each contract manufacturer proposes to build the product against data from units already built, so differences in tooling, test and yield assumptions surface before tooling is committed.
Whether it’s an early concept, a working prototype or something already in production, tell us where it stands and what it needs next.
We can help engineer it, build it, or both.
Do you have a demanding application? Treetown Tech can turn your ideas into real-world solutions. Tell us more about your project, and we’ll help you identify risks, manufacture prototypes, validate designs, and even provide production support.
