In this Question Line video, Jason answers the following questions about considering form in tolerance stack-up calculations:
I’m analyzing the attached drawing and have two quick questions about datum feature A’s flatness tolerance:
- Should I include its flatness in my stack-up calculation for the maximum/minimum gap between the two surfaces?
- If yes, how do I properly calculate its effect?
In this Question Line video, Jason reviews a submitted drawing where two identical parts are placed back-to-back, creating a gap that the contributor wants to perform a tolerance stack-up analysis on. He first examines the tolerance of the individual part, then walks through the analysis of the assembled condition. Jason also explains how the geometry of the parts can affect worst-case scenarios and whether the flatness tolerance of the mating surfaces should be included in the overall stack-up.
Have a GD&T question? Ask our experts using the link below!
https://www.gdandtbasics.com/share-your-gdt-questions/
If your question is selected, we will notify you when our video answer is posted to our YouTube channel.
* If you are a current student, reach out to us directly and we will get you into contact with your instructor. Active students’ questions receive a direct response within 24-48 hours.
Stop hunting through pages. Get our GD&T Symbols Chart—your quick reference guide with every symbol on one page.
Save it to your desktop or print it out for quick reference. We’ll send the digital chart straight to your inbox. No spam, just helpful GD&T resources.
Get Your Free Chart