GD&T Maximum Material Condition (MMC) Formula and Visualization

This is an excerpt from our GD&T Advanced Course. To learn more visit https://www.gdandtbasics.com/gdt-training. One of the most powerful tools in GD&T is the Maximum Material Condition (MMC) modifier. This allows you to specify a "Virtual Condition" boundary on your part where you can guarantee 100% assembly and interchangeability. You essentially have a variable geometric tolerance that depends on your size tolerance. The closer your size tolerance is to a beneficial assembly condition, the more geometric error you are allowed in your part.