Engineering Talk - DCS's Blog on Quality and Engineering

T&T Using Datum Shift Simulators in Variation Analysis - 3DCS

Datum Shift Simulators in Variation Analysis

Datum Shift refers to the available assembly clearance of a part when located in a fixture for gauging.

Edited 6-10-2015

When a datum in a datum reference frame (DRF) is specified at MMC/MMB, the datum feature simulators (e.g. gage pins) will be made as though the datum features are at their MMB (e.g. holes at their smallest size.)  Therefore, when a part with datum features not at MMB is placed on the gage, it can be adjusted so that the features being measured are closer to nominal.  Since the measured variation is less, the features can have more variation relative to each datum axis or center-plane.

Topics: 3DCS T&T

3DCS and QDM Wizards - Tools and DLL's to Make CAD Modeling Easier


3DCS and QDM Wizards - Tools and DLL's to Make CAD Modeling Easier


Introduction: Model or Template Wizards 


We’re not talking about Gandolf or Merlin for 3DCS, but helpful tools that will help users with their overall modeling experience. These tools are often overlooked by both 3DCS and QDM users. If you are looking for specific information about these tools, visit the DCS Community and view the Help Manual. More information about these tools is available in the Community or the Help Manual         

 This month’s Tips and Tactics will go through a list of available Wizards and helpful tools for 3DCS and QDM; where they are at and how they can help users with their 3DCS model or with QDM template creation.



Topics: 3DCS T&T QDM

How to Bring Real Manufacturing Data into Your 3D CAD Simulation - Closed Loop

How to Bring Real Manufacturing Data into Your 3D CAD Simulation

3DCS Variation Analyst and QDM - Quality Data Management Systems can be used together to create a Closed Loop approach to quality. This creates feedback loops in process, bringing inspection data from manufacturing into the 3D CAD model for root cause analysis, design optimization and continuous quality improvement. 

So how does this solution work?

Topics: 3DCS Tolerance Analysis T&T QDM

Enhanced Scenes in CATIA V5 - Customizing Views to Assemble and Compare

Enhanced Scenes

     Customizing Your Assembly in CATIA V5 and 3DCS

Enhanced Scenes allow you to customize the configuration of your model at nominal and exploded view. This can be helpful when modeling assembly processes or checking your work.


Topics: CATIA 3DCS T&T

How to Use CATIA Symmetry and 3DCS Mirror to Save Time on CAD Modeling

CATIA Symmetry and 3DCS Mirror 

Useful tips on quickly creating symmetrical models and duplicating data.

This Tips and Tactics will display how both Mirror and Symmetry work together to reduce modeling time and create symmetrical models.   

The Symmetry function in CATIA V5 is used to create a symmetrical mate to a part or assembly. This allows users to quickly craft only half of an assembly, and then mirror the other half to create a perfectly symmetrical product.

Topics: 3DCS T&T

How to Use Confidence Interval to Improve Dimensional Analysis Part 3

Where Is DCS Getting These Numbers?

How do you know your results are accurate? Here are some methods of calculating your Confidence Interval

Dimensional Control Systems 3DCS® is a variation analysis tool that uses Monte Carlo simulation to predict the results of a set of measurements [Dimensional Engineering News, June 2009]. After a variation model is built in 3DCS®, a Monte Carlo simulation can be performed to provide the following statistics:

Descriptive statistics - calculations made directly from the sample data such as mean, minimum, maximum, standard deviation, percentage out-of-spec, confidence intervals, etc.

Inferential statistics – estimations based on a curve-fitting algorithm such as estimated low, estimated high, estimated percentage out-of-spec, etc.

Topics: 3DCS T&T DE Focus

Best Practices: Working with Large Models

Best Practices to Working with Large Models in CATIA and 3DCS

Large models keeping you down? Taking you an hour to save your work? 

Try some of these Tips to make your life easier. 


Topics: 3DCS T&T

CATIA V6 Manufacturing Simulation and Sub-Assembly Modeling in the 3DExperience

Sub-Assembly Modeling in CATIA V6 for the 3DExperience

The shift in the 3DExperience to using Manufacturing Simulation for Dimensional Analysis changes the way 3DCS stores data and creates simulations.


In this Tips and Tactics, we explore the methods of sub-assembly tolerance analysis modeling when using 3DCS for V6 in the 3DExperience, starting with the process of bringing 3DCS models from CATIA V5 into CATIA V6.


T&T Add Commands and Toolbars to CATIA 3DCS Workbench

Customize and Add Your Own Toolbars to 3DCS in CATIA V5-6

Find yourself using the same functions over and over? Create a toolbar with those specific functions for quick access and faster modeling. 



Tired of moving from Assembly Design in CATIA to 3DCS and back? 

Looking to consolidate your tools together for ease of use?

Topics: 3DCS T&T

T&T: CATDUA V5 in CATIA Version 5, Fixing Data Errors and Issues

Use CATDUA to Quickly Fix Errors When Working with CATIA V5-6 Models

CATDUA V5 is a tool offered in CATIA for repairing data errors. 

Officially the CATIA Data Upward Assistant, as part of CATIA V5, has a number of helpful uses. These double when working with 3DCS Variation Analyst CAA V5 Based, integrated in CATIA V5-6. 

Some of the handy uses of CATDUA V5 are:

  • Recovering external data
  • Going into a new CATIA release
  • Repairing broken links in CATProducts, before opening them
  • Fixing incidents when updating a component (such as Sketch update)
  • When the Edit-Links window appears and some documents are found but have no references
  • Repairing performance problems when opening a CATProduct (because some elements have lost their links)


Topics: CATIA T&T