Tag: Datum Reference Frame

Positional Control of X, Y, and Z

by Crystal Bemis on December 2, 2024.

In this Question Line video, Jason discusses the positional control of the X, Y, and Z translations for a cylindrical post on the submitted drawing. He defines the datum reference frame and zero point of the part and explains why the feature control frame in question is essential to constraining where the cylinder exists vertically.

The Importance of Qualifying Datums

by Crystal Bemis on November 4, 2024.

Jason explains how datums are qualified and the difference in how CMMs and physical datum simulators set up the datum reference frame.

How to Find Zero

by Crystal Bemis on October 21, 2024.

In this Question Line video, Jason shows how to fine the zero, or origin, for a given feature control frame.

Datums for Castings

by Crystal Bemis on September 9, 2024.

In this Question Line video, Jason discusses how datum targets, datum reference frames, and multiple datum structures can be of assistance in casting drawings.  

Common GD&T Student Questions: A Pattern of Holes as a Datum Feature

by Crystal Bemis on March 28, 2023.

We often see a pattern of holes indicated as a datum feature in a GD&T drawing. How do we simulate this to create our datum reference frame?

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...

Using a Complicated or Curved Surface as a Datum

by Tom Geiss on June 11, 2020.

In this question line video – Tom discusses how to understand a curved profile surface as a datum for 4 holes that are required to remain normal to the irregular surface. How do we do...