In this Question Line video, Jason answers the following question regarding flatness and Rule #1:
I recently completed the GD&T Basics course and passed the exam. There is one question related to flatness that I missed that I’d like to understand better.
The student referred to the following exam question:
Jason shows how to calculate the amount of flatness for the top surface based on the size tolerances and Rule #1. He notes that the top surface is only required to be flat because of Rule #1, and the flatness of the bottom surface has no effect on how much flatness the top surface is allowed.
We want to hear from you! Submit your GD&T question at 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