Tec-Ease, Inc. provides the most comprehensive GD&T training and coaching in the industry. Our GD&T courses are designed to keep the participant interested and engaged, while having fun.
Tec-Ease, Inc. software packages are designed to help train and offer continued support to companies and employees in the industrial manufacturing field.
On simple parts the dimension origin symbol may be used very effectively. This bracket mounts on the shorter surface as shown. A lamp is attached to the longer surface. It is desirable to inspect the 38mm dimension by mounting the part on the functional shorter surface. By using the dimension origin symbol, it is required that this dimension be inspected by mounting the bracket on the shorter surface. The same control could be accomplished by calling out the shorter surface as a datum feature and applying a profile of a surface control on the longer surface.
This tip is in accordance with ASME Y14.5M-1994, Y14.5-2009 and Y14.5-2018.
This tip was originally released in May 2001.