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 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.

This video is in response to a question that we received on our question line from Ignacio.  Ignacio asked us if it is a bad practice to reference three datums in a single drawing callout for the parallelism symbol.  The short answer is yes, that is a bad practice.  To explore this in more detail,…

by GD&T Basics on February 12, 2021.

Ever wonder how surface finish is measured? For inspection, we use a device called a Profilometer.  In this article, we will show you how profilometers work and highlight their advantages and limitations. What is a Profilometer & Why is it Used? A profilometer is an instrument used to measure the profile and surface finish of…

by GD&T Basics on February 12, 2021.

In this video, Brandon discusses the difference between measuring Flatness of a Surface and Flatness of a Feature of Size (FOS). Flatness of a Surface Surface flatness is the type of flatness that most people are familiar with. On a drawing, the flatness callout can point straight to the surface with a leader arrow or…