AUTOMOTIVE ENGINEERING GLOSSARY
Stack-up direction
The signed relationship showing whether each dimension increases or decreases the functional result.
Why it matters in automotive product engineering
A clearance stack must distinguish dimensions that add to the gap from those that reduce it.
Related learning page
Definitions are educational summaries. Always use the applicable customer specification, approved engineering procedure and current standards for programme decisions.
COMMON QUESTIONS
Frequently asked questions
Clear answers to help you understand the topic and its learning value.
What does Stack-up direction mean in automotive engineering?
Stack-up direction is an engineering term used to describe a specific concept, feature or process. Its exact meaning should be interpreted in the context of the component, drawing, specification or development activity.
Why is Stack-up direction important?
Understanding Stack-up direction helps engineers communicate design intent, assess requirements and make decisions that support product function, manufacturing and quality.
Where is Stack-up direction used during vehicle development?
It may be considered during component design, engineering reviews, manufacturing planning, inspection or validation, depending on the system and programme requirements.
What should an engineer check when working with Stack-up direction?
Check the applicable drawing, specification, functional requirement, interfaces and acceptance criteria. Confirm assumptions with the responsible engineering or quality team.
How can I learn Stack-up direction with a practical example?
Use a representative component or drawing, identify the requirement, explain the engineering purpose and document the checks or evidence needed. Keep learning examples separate from confidential customer information.