Tag: Rule #1

Go/No-Go Gaging and Rule #1

by Crystal Bemis on November 14, 2023.

In this Question Line Video, Brandon explains Rule #1 of GD&T (the Envelope Principle) and how Go/No-Go gages are used to verify that Rule #1 is met for a feature of size.

Designing to MMC and LMC

by Crystal Bemis on August 30, 2023.

In the Question Line Video below, Jason answers a student’s question regarding whether a feature of size can be designed to both Maximum Material Condition (MMC) and Least Material Condition (LMC) boundary constraints.

Rule #1 and Derived Median Line Straightness

by Crystal Bemis on May 30, 2023.

"Why doesn’t Rule #1 apply to the straightness of a Derived Median Line?" In this article, we look at both surface straightness and straightness of a feature of size to understand why Derived Median Line Straightness overrules Rule #1 of GD&T.

GD&T Rule #1: Envelope Principle

by Jason Richter on March 3, 2022.

GD&T Rule #1, also known as the Envelope principle, states that the form of a regular feature of size is controlled by its “limits of size." Limits of size, or otherwise known as size tolerances, can be seen in many forms. A few of them are symmetric, unilateral, and bilateral.

Parallelism Feature of Size – Rules for DRF

by GD&T Basics on February 14, 2021.

This video is in response to a question that we received on our question line from Jamee.  Jamee’s question is as follows: “For parallelism of a circular feature of size (axis) can you use two...

Cylindricity – Can you use Material Modifiers?

by GD&T Basics on February 14, 2021.

This video is in response to a question that we received on our question line from Lokesh.  Lokesh asked us if a material modifier can be used with cylindricity.  Geometric Dimensioning and Tolerancing modifiers are...

Circularity, Rule #1, and How to Report

by GD&T Basics on February 12, 2021.

This video is in response to a question that we received on our question line from Amber. Amber asked us if the tolerance value for circularity can be obtained by subtracting the upper limit of...