But Sigmetrix are experts at 3D tolerance analysis – Why introduce a stand-alone 1D product?

We know not everyone needs, or believes they need, a solution as powerful as CETOL 6σ, so this new solution should be of great interest to Mechanical Designers and Engineers who are involved in CAD-modeling activities. It automates many of the common but time-consuming and often error-prone tasks required for 1D stackup analyses. It provides a more complete picture than traditionally obtained from a spreadsheet calculation and can alert the user in many situations when the tolerance stackup may not be 1D in nature.

Will it work with my CAD system?

YES! EZtol works with files from most major CAD systems, and it does not utilize the CAD license to work on the model.

Supported File Types

Translator Supported Versions
Alias V10 or later
CATIA V4 All Revisions
CATIA V5 R6 – V5-6R2015
Creo Parametric 1.0; 2.0; 3.0
DWF/DWFx 6.0 – 7.5
DWG All Revisions
IDF 2.0; 3.0
IGES All Revisions
JT 7.0 – 10.0
NX Unigraphics V13 – NX 10
Parasolid Up to 28.0
Pro/ENGINEER Up to Wildfire 5.0
Pro/ENGINEER Granite Up to 9.0
Pro/ENGINEER Neutral N/A
Rhino Up to 5.0
RVT Up to R2017
SAT Up to 7.0
SolidWorks 2001 Plus – 2016
STEP AP214, AP203E2, AP242
SMT Up to ASM222


What is the difference between TAE in Creo and EZtol?

TAE is a 1D tolerance analysis tool integrated within Creo that lets the user define tolerance studies while continuing to work in their Creo session. It’s primary advantage over the new EZtol program is that it works directly with dimensions and associated tolerances in the Creo model files. This means as the tolerances are adjusted based on the analysis results they are automatically transferred back to the Creo model data.

EZtol is a standalone application that can open files from many different CAD packages. As such it doesn’t require the source CAD software to be running. It offers a different workflow for the definition of tolerance stackups similar to CETOL – namely feature-based definition instead of selecting dimensions in the loop.

A few of the capabilities EZtol offers over TAE include:

  • handling more types of geometric tolerances
  • allowing the user to select RSS in addition to worst-case and statistical analysis methods
  • alerting the user to many situations where a 1D treatment may not be sufficient to fully understand the actual variation that can occur
  • automatically capturing snapshots of the loop definition on the assembly model to include in the report

While it doesn’t obtain dimension and tolerance information from the source files, nor can it update them, it does maintain the concept of part-level dimensioning schemes so that dimensions appearing in multiple stackup definitions are easily identifiable.