# Review a part design for manufacturability before release

A design for manufacturability (DFM) review that flags features driving cost, scrap, or long lead times, with suggested changes ranked by impact.

- Topic: Product & UX Design
- Framework: Few-Shot
- Level: Advanced
- Tags: Analyze, Code, Fill-in Template
- Source: https://www.thinkwithprompt.com/prompts/review-a-part-design-for-manufacturability-before-release

## Prompt

```text
Review a part or assembly design for manufacturability (DFM/DFA) before it is released.

**Part or assembly:** [description, function, and where it fits in the product]
**Manufacturing process planned:** [e.g. CNC machining, injection molding, sheet metal, casting, PCB assembly, additive]
**Material:** [SPEC]
**Key features and tolerances:** [PASTE drawing notes, critical dimensions, GD&T callouts, surface finishes, wall thicknesses, hole sizes]
**Annual volume and target cost:** [NUMBERS]
**Our in-house capabilities or supplier limits:** [machines, max part size, typical achievable tolerances]

Review the design for:
1. Tolerances tighter than the function needs, and the cost or capability impact (compare with typical capability for the process).
2. Process-specific issues, for example: molding (draft angles, uniform walls, undercuts, sink, gate location); machining (deep pockets, small internal radii, thin walls, number of setups, non-standard hole sizes); sheet metal (bend radii, hole-to-bend distances, flat pattern); casting (shrinkage, parting line).
3. Assembly: part count, fasteners that could be eliminated, parts that can be installed wrong (error-proofing by design), access for tools.
4. Inspection: can every critical feature actually be measured with the gauges available? Are datums clear?
5. Material and finish choices that add lead time or cost.
6. Standardization: can we use existing parts, fasteners, or material sizes?

Return a table: Feature | Issue | Risk (cost/scrap/lead time/quality) | Suggested change | Impact (high/medium/low) | Needs design engineer approval? Then the top 3 changes to make first.

Do not change any requirement that affects function or safety without design engineering approval. Mark assumptions about process capability [CONFIRM WITH SUPPLIER].
```

## What to fill in

- description, function, and where it fits in the product
- SPEC
- NUMBERS
- machines, max part size, typical achievable tolerances
- CONFIRM WITH SUPPLIER

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