3D Product Prototyping and Testing 2 — Questions and Answers
Question 1: What is a 'foam core model' used for in industrial product design?
- A quick, inexpensive 3D form study to evaluate proportions, scale, and ergonomics before committing to CAD (Correct answer)
- A thermal insulation prototype for temperature testing
- A buoyancy test model for marine products
- A mold core made from foam for casting
Correct answer: A quick, inexpensive 3D form study to evaluate proportions, scale, and ergonomics before committing to CAD
Foam core models (made from blue or pink urethane foam) allow rapid 3D form exploration at full scale, giving designers a physical sense of proportion and ergonomics.
Question 2: What is 'DFT' (Design Freeze) in a hardware product development timeline?
- The milestone when the product design is locked and no further changes are made before tooling investment (Correct answer)
- A cold-temperature performance test
- A digital file transfer protocol for design files
- The final firmware build for mass production
Correct answer: The milestone when the product design is locked and no further changes are made before tooling investment
Design freeze is the formal milestone at which the product design is approved and locked — any changes after this point incur significant time and cost penalties on tooling.
Question 3: What is 'heuristic evaluation' in product usability testing?
- Expert reviewers assess a product's interface against established usability principles without end users (Correct answer)
- A scientific lab test requiring specialized equipment
- User testing with a minimum of 100 participants
- An AI-automated accessibility scan
Correct answer: Expert reviewers assess a product's interface against established usability principles without end users
Heuristic evaluation has 3–5 UX experts inspect a product interface against Nielsen's 10 usability heuristics, rapidly identifying usability problems without recruiting end users.
Question 4: What is 'FMEA' (Failure Mode and Effects Analysis) and when is it used in product development?
- A structured analysis that identifies potential failure modes, their causes, and effects to prioritize risk mitigation before production (Correct answer)
- A post-launch failure report from field returns
- A supplier quality audit process
- A simulation tool for structural finite element analysis
Correct answer: A structured analysis that identifies potential failure modes, their causes, and effects to prioritize risk mitigation before production
FMEA systematically catalogs every way a product can fail, rates each by severity, occurrence, and detectability, and drives design and process improvements to reduce risk.
Question 5: What is a 'T1 sample' in the injection molding process?
- The first parts produced from a new production mold, used to evaluate dimensional accuracy and surface quality (Correct answer)
- A material test coupon cut from a titanium billet
- The first color variant approved in CMF review
- A tolerance sample sent to the quality lab
Correct answer: The first parts produced from a new production mold, used to evaluate dimensional accuracy and surface quality
T1 (Tool Trial 1) samples are the first shots from a new injection mold — evaluated against drawings to identify required mold modifications before production approval.
Question 6: What is 'A-surface' and 'B-surface' in product design terminology?
- A-surface is the customer-visible, cosmetically critical exterior; B-surface is the interior, hidden functional side (Correct answer)
- A-surface is the top face; B-surface is the bottom face of a part
- A and B surfaces refer to two mold halves in injection tooling
- A-surface is Class A finish; B-surface is a textured finish
Correct answer: A-surface is the customer-visible, cosmetically critical exterior; B-surface is the interior, hidden functional side
A-surface receives full cosmetic finishing and is held to tight appearance standards; B-surface is unseen and only needs to meet functional and structural requirements.
3D Product Prototyping and Testing 2
What is a 'foam core model' used for in industrial product design?