GD&T Articles

by GD&T Basics on February 14, 2021.

This video is in response to a question that we received on our question line from Tim. Tim’s question is as follows: “We tend to use true position on threaded holes.  Is this valid?  If so, what is the proper way to measure it, and what is it “actually” measuring?  Is it the true position…

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 surfaces perpendicular to each other (that are both parallel to the feature axis) as datum references within the FCF to…

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.  GD&T modifiers are maximum material condition, or MMC, and least material condition, or LMC.  The MMC and LMC modifiers cannot be used with cylindricity, but according…

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 diameter from the lower limit of diameter and dividing it in half. The short answer is no; that method does not…

by GD&T Basics on February 12, 2021.

Orthographic views allow us to represent a 3D object in 2D on a drawing. Orthographic views can show us an object viewed from each direction. How the views are laid out on a drawing depends on whether 3rd angle or 1st angle projection is being used. You can tell which angle projection is used by the symbol…