Home View Shopping Cart Contact Us Home
Drafting Zone GD&T Seminar
Drafting Practices and StandardsGeometric Dimensioning & Tolerancing Study ZoneTips & ToolsInspection Guides Configuration data management advisories
Get Acrobat Reader Datums Study Guide

A datum is a theoretically exact plane, axis, line, or point. A datum does not actually exist on a workpiece or tool since these items have imperfections. Datums are located from the inexact features on a part. The imperfect features on a workpiece that are used to establish a datum location or orientation are known as datum features. Datum features are physical entities. They are not theoretical entities such as centerlines, axes, or reference planes. Datum features are imperfect, but the associated datum is theoretical and therefore perfect. A tolerance specification that controls a feature relative to datums must include one or more datum references. The references are shown in a feature control frame.

This Study Guide is available as an Adobe PDF file. In order to view it, you must have installed Adobe Acrobat or the free Adobe Acrobat Reader. To download the free reader, click the "Acrobat Reader" icon.

Resource Locked Launch Study Guide In Adobe Acrobat



Datums Study Quiz

This Study Quiz is designed to test your knowledge of the material covered in the Datums Study Guide. This Quiz will begin as soon as you click the "Begin Quiz" link.

Number of Questions: 5
Passing Score: 850
Time Limit: 10 minutes

Resource Locked Begin Quiz

Home | About | Join Now | Meet the Experts | FAQ | Shopping Zone | Contribute | Contact Us