Category: Profile

by GD&T Basics on April 12, 2021.

What is the difference between unilateral and bilateral tolerance in a profile of a surface callout? In this post, Brandon explains the difference and gives examples of how they are used. Profile of a Surface When applying a 3-Dimensional tolerance zone around a surface, usually a curved shape but could be any, the Profile of…

by GD&T Basics on April 6, 2021.

This video is in response to a question that we received on our question line from Amar. Amar’s question is as follows: “If we are given a BASIC radius of 10mm, and on the radius, we are applying a Profile of a Line Tolerance of 0.6mm, what will be the max & min size of…

by GD&T Basics on January 13, 2021.

This video is in response to a question that we received on our question line from Brandon.   The question is as follows: “I have profile tolerance on a flat surface of 0.2 mm with respect to 3 datums.  Now measuring with a CMM, I get deviations to the negative and positive side of nominal.  For…

by Seth Elder on October 12, 2020.

In this article, we explain the differences between bilateral, unilateral, and unequally disposed tolerances. What is a Tolerance? Tolerances on technical drawings communicate the amount of variation permitted from a target dimension.  The allowable variation can be visualized as a zone surrounding the ideal surface of the part – what is called “true profile.”  For…

by GD&T Basics on December 18, 2014.

GD&T Symbol:  Relative to Datum: Optional MMC or LMC applicable: No Drawing Callout: Description: Profile of a surface describes a 3-Dimensional tolerance zone around a surface, usually which is an advanced curve or shape. If it is called out on a curved surface, like a fillet on a welded part, the entire surface where the…