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A hardware product rarely moves directly from a concept sketch to a production line. Between those two points are a series of engineering decisions that determine whether the product will perform as intended, whether its components can be assembled efficiently, whether the selected manufacturing process is appropriate, and whether the design can be produced consistently at the required volume. A CAD model is an important part of that process, but it is only one part. A product can have a complete 3D model and still have problems with material selection, tolerances, assembly access, manufacturability, structural performance, or production economics. Those problems become progressively more expensive to address as development moves from concept to prototype, tooling and production. In practice, many manufacturing problems are not caused by a single major design error. They often come from small decisions made early in development—an inaccessible fastener, an unnecessarily tight tolerance, an unsuitable datum, a difficult-to-machine feature, or geometry that complicates tooling. This is where hardware product engineering becomes important. Rather than treating CAD, prototyping, DFM, validation and manufacturing support as disconnected activities, product engineering brings them together around the requirements of the finished product. The objective is not simply to create geometry that works in CAD. It is to develop a product whose design, materials, tolerances, assembly method and manufacturing process work together under real production conditions. Almost 70% of manufacturing costs are determined during the design phase and yet, most product teams only begin thinking about manufacturing after the design is finalized. This is a profound problem in product development. Manufacturing Cost Is Often Shaped Early This is why manufacturing considerations need to be introduced early in the product development process. Decisions about materials, tolerances, part geometry, manufacturing processes, assembly methods and tooling can significantly influence the final cost and production feasibility of a product. Addressing these factors during design can help identify potential manufacturing and cost issues before they become expensive changes later in development. Need Engineering Support for Your Hardware Startup? Whether you are refining a concept, developing your first prototype, or preparing an existing design for manufacturing, the right engineering support can help you make better decisions earlier. Explore Engon’s Mechanical Product Engineering Support → 1. Why Product Engineering Decisions Matter Before Manufacturing Product Engineering at a Glance The objective is not simply to create geometry that works in CAD. It is to develop a product whose design, materials, tolerances, assembly method and manufacturing process work together under real production conditions. Requirements Architecture Mechanical Design Prototype Validation DFM Production Product engineering connects early design decisions with the realities of manufacturing, assembly, validation and production. Many of the decisions that influence downstream manufacturing problems are made before a product reaches production. Understanding those relationships early can help prevent expensive changes later. 2. Define the Product Architecture Before Detailed CAD What Needs to Be Defined Early · Product dimensions and packaging constraints · Electronics and component interfaces · Material requirements · Environmental conditions · Expected production volume · Market-specific compliance requirements · Manufacturing processes · Assembly requirements · Serviceability · Performance and testing requirements  Engineering Scenario: Compact Industrial Monitoring Device Consider a compact industrial monitoring device containing a PCB, battery, connectors, and mounting hardware. Before detailed CAD begins, engineers must determine how these elements will fit together, how the electronics will be installed, how the housing will be assembled and serviced, and which manufacturing process will support the expected production volume. Validation: Engineers evaluate these requirements together before finalizing the mechanical architecture and detailed CAD. Engineering Insight: Early architectural decisions can affect manufacturing, assembly, serviceability, and downstream component design. Key Takeaway: Defining these relationships early helps prevent costly redesigns later. 3.Design the Product Around Its Manufacturing Process Once the architecture is established, mechanical engineering turns the requirements into physical components and assemblies. This includes 3D CAD, component design, assemblies, interfaces, material selection, tolerances and engineering drawings. Production Consideration Production volume can change what constitutes an appropriate design. A geometry suitable for a low-volume CNC prototype may need to be reconsidered when the product moves toward injection molding. The important distinction is that mechanical design should be developed with the eventual manufacturing process in mind. Designing for CNC Machining For CNC machining, engineers may need to consider tool access, internal corner radii, feature depth, workholding and the number of machining setups. Manufacturing Process Design Considerations Injection molding Draft, wall thickness, ribs, bosses, undercuts, parting lines, gate locations and ejection strategy CNC machining Tool access, internal corner radii, feature depth, workholding and number of machining setups Sheet metal Bend radii, bend sequence, material thickness and feature placement Design Decision The manufacturing process should influence the geometry before detailed CAD is finalized—not be treated only as a downstream decision. At the prototype stage, keeping these elements separate may make development and design changes easier. As production requirements become clearer, however, engineers need to evaluate whether the current design is appropriate for the intended manufacturing process. 4. Small Design Decisions Can Create Major Production Problems Snap-Fits A snap-fit can eliminate screws and simplify assembly, but its suitability depends on the material, geometry, deflection, assembly force and expected use. For a plastic enclosure, a snap-fit that appears functional in CAD may still require engineering evaluation for repeated assembly, stress concentration and manufacturing limitations. Engineering Scenario: When a Snap-Fit Works in CAD but Not in Practice A plastic enclosure uses snap-fits to reduce screws and simplify assembly. The feature works in CAD, but prototype testing shows that it requires excessive assembly force and may not withstand repeated opening and closing. Engineers review material behaviour, allowable deflection, stress concentration, assembly direction, operating temperature, and moulding constraints before finalizing the feature. Validation: Physical testing confirms whether the snap-fit can be assembled consistently and perform reliably under expected use. Key Insight: A feature that works geometrically in CAD may still require changes when real material behavior, manufacturing variation, and actual use are considered. Before Engineering Review Production Decision Prototype design: separate components may make early iteration easier. Evaluate consolidation, wall thickness, draft, fastening, material and assembly. Consolidate components only where the overall

A Design Review is one of the most important checkpoints in any Product Development Process. When engineering, manufacturing, and quality teams sit down to evaluate a design before it moves forward, they have a rare opportunity to catch problems while changes are still cheap. Companies across industries often partner with experts in mechanical product engineering in the US and Europe to validate manufacturability, identify design risks, and ensure products are ready for production before significant investments are made. A thorough Product Design Review can mean the difference between a smooth launch and a production line that grinds to a halt. The cost of finding design issues after tooling or production begins is dramatically higher than catching them during review. A flaw discovered on paper might cost a few hours of rework. The same flaw discovered after a mold has been cut, a fixture built, or a production batch run can cost tens of thousands of dollars and weeks of schedule slip. Effective reviews reduce redesign, delays, and manufacturing risk across the board. This article walks through 10 of the most common design review mistakes companies make and explains how to avoid them, so your next Engineering Design Review can catch critical issues before they reach the shop floor. Overview A Design Review brings cross-functional teams together to evaluate a product before it advances to tooling or production. Common mistakes, such as skipping early-stage reviews, ignoring tolerancing, or overlooking material availability, can delay production, raise engineering costs, and reduce product quality. Structured, cross-functional reviews that include manufacturing, quality, procurement, and supply chain input can improve manufacturability and significantly reduce overall project risk. 1. Skipping or Rushing Early-Stage Design Reviews (PDR/CDR) The Preliminary Design Review (PDR) and Critical Design Review (CDR) are two of the most valuable checkpoints in the Product Development cycle, yet they are often rushed when schedules tighten. The Preliminary Design Review (PDR) confirms that the overall design approach is sound before detailed engineering work begins, while the Critical Design Review (CDR) verifies that the design is ready for release to manufacturing. Skipping or compressing these milestones makes it much harder to identify technical and manufacturing risks before design freeze. Once a design is frozen, the cost of late design changes rises sharply because tooling, fixtures, supplier commitments, and production planning may already be in motion. Early stakeholder alignment during PDR and CDR helps prevent unexpected problems from surfacing downstream, when they are far more expensive and time-consuming to fix. 2. No Cross-Functional Team Involvement A Mechanical Design Review that only includes engineers misses critical perspectives. The strongest reviews bring together Engineering, Manufacturing, Procurement, Quality Assurance, Supply Chain, and Service & Maintenance teams, each contributing a different lens on the same design. A cross-functional design review brings together stakeholders with different responsibilities and decision-making priorities, helping teams identify technical, manufacturing, sourcing, quality, and service risks before they become production problems. Manufacturing flags process limitations before they become production blockers. Procurement identifies sourcing constraints early in the cycle. Quality Assurance raises inspection and tolerance concerns early in the process. Supply Chain flags lead-time and component risk. Service & Maintenance teams highlight long-term serviceability needs. These assembly and serviceability considerations can significantly affect production efficiency and cost; learn more about design decisions that reduce assembly time and manufacturing costs → The benefit of collaborative decision-making is that issues surface while they are still inexpensive to fix, rather than after commitments have already been made. When these perspectives are included early, teams can make better-informed design decisions and reduce the likelihood of costly redesigns, production interruptions, and late-stage changes. 3. Poor Version Control and Engineering Change Management (ECM) When multiple versions of a drawing circulate without clear labeling, different teams end up working from different versions of the design. This creates a serious risk of manufacturing errors, incorrect purchasing decisions, and costly rework. Production might be machining to Rev C while procurement ordered materials against Rev B specs. This mismatch often isn’t caught until parts fail to fit or an inspector flags a discrepancy, by which point time and material are already lost. Engineering Change Orders (ECO) An ECO is the formal instruction to implement an approved change, whether it’s a dimension update, material substitution, or process revision. It typically documents what’s changing, why, who approved it, and the effective date. A well-controlled ECO process ensures that engineering changes are formally reviewed, approved, documented, and communicated before they affect production. Without a proper ECO process, changes get made informally through emails or verbal instructions, which are easy to miss and impossible to audit later. Engineering Change Notices (ECN) While an ECO authorizes a change, an ECN communicates that a change has happened. It’s the notification that pushes updated information out to everyone affected, manufacturing, quality, purchasing, and suppliers, so no one is left working from stale data. This communication step is critical because an approved engineering change is only effective when every affected team receives and implements the updated information. Skipping this step is a common reason outdated drawings keep resurfacing even after a design has already been revised. Drawing management This covers how drawings are stored, labeled, and retrieved so the current revision is always easy to identify. Simple conventions, like consistent revision blocks, clear naming, and restricted edit access, prevent the everyday mix-ups that cause the biggest downstream headaches. A controlled drawing management process should also make it clear which revision is approved for manufacturing and prevent obsolete drawings from being used accidentally. PLM/PDM systems Product Lifecycle Management and Product Data Management systems give this process real teeth by centralizing files, enforcing revision control, and tracking approval history automatically. Rather than relying on individuals to remember which version is current, the system itself controls access and visibility, cutting down on human error significantly. These systems also provide traceability, making it easier to identify when a change was made, who approved it, and which teams or suppliers need to act on the updated information. Preventing outdated files from reaching production The final safeguard is making sure obsolete drawings simply cannot reach the shop