Do your tolerances meet ASME standards? Ask Creo 4.0
Written By: Aaron Shaw

Geometric Dimensioning and Tolerancing (GD&T) is a symbolic language used to communicate design specifications. GD&T can speed up processes and reduce errors.

A 3D model annotated with GD&T information.

You’ll have fewer prototypes and scrap parts because you’ve told manufacturing just how much a part can deviate from the design before it just won’t work anymore.

However, just like any method of communication, GD&T is only effective if everyone is speaking the same language—or using the same set of standards. It doesn’t work if even a few people aren’t using it correctly.  

GD&T symbols—Do you know what they mean?

Creo takes the guess work out of GD&T. Your organization will communicate with a universal language—a common set of standards. For example, ASME Y14.5-2009.

In Creo, tolerances are automatically checked for compliance with ASME standards. Take a look:

Here’s how to check an annotation for ASME compliance:

  1. From the Annotate tab > click Geometric Tolerance.
  2. Select a surface on the drawing/assembly and place the annotation on your geometry.
  3. Select the appropriate Geometric Characteristic Symbol.
  4. Type a tolerance value.
  5. Click Symbols and select a symbol that applies to the tolerance.

If the tolerance/symbol violates ASME standards, you’ll see a warning message. Like this one:


Learn More About GD&T

Are you a PTC Support customer? You can learn more about how to create a geometric tolerance in Creo Parametric from this Support Knowledge Base article. These articles are one of the many benefits available to PTC Support customers.

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About the Author Aaron Shaw

Aaron Shaw joined PTC in 2013, currently he is the Senior Manager, CAD Demand Generation. He is responsible for the CAD marketing strategy and execution worldwide. He enjoys playing golf, eating spicy foods, reading, traveling, and rooting for all Boston teams. Aaron is a graduate of Penn State, you can follow him on Twitter @AaronEShaw.