Engineering Talk - DCS's Blog on Quality and Engineering

What Is a Tolerance Stack Up?

What Is a Tolerance Stack-Up? How Do You Calculate It?

Tolerance Analysis encompasses several processes used to determine the potential accumulated variation in manufactured parts and assemblies.

It is often applied to manufactured parts in general to determine the impact of manufacturing processes on the final dimensions of those parts. Tolerances are determined by a variety of methods, from standards such as ISO or ASME, or from the use of geometric dimensioning and tolerancing (GD&T), a method of annotating and marking tolerances on parts.

Methods of Tolerance Analysis

Topics: 3DCS Tolerance Analysis T&T

DCS Workshops Teach Tolerance Analysis Skills - FEA and Modeling Tips

DCS Workshops Teach Tolerance Analysis Skills - FEA and Modeling Tips

DCS Workshops at the DCS Global Technology Conference teach new users how to bring Finite Element Analysis into their tolerance analysis simulations and a series of tips, tools and tactics to improve modeling speed and efficiency.

From Tackling Tough Tolerance Analysis Scenarios - DCS Conference Day 3

DCS Workshops - Modeling Efficiencies and FEA Compliant Modeler

With the morning over, the room was re-formed into two smaller rooms to conduct the training workshops. There were two workshops in total, and all attendees were able to attend one, then the other. 
Topics: Global Technology Conference 3DCS 3DCS Creo CATIA CATIA V6 FEA PTC Creo Siemens NX T&T Tolerance Analysis

2 Methods of Checking Your Assembly Sequence - LSA and DoF Counter

2 Methods of Checking Your Assembly Sequence in 3DCS 

Two tools to validate your moves and assembly sequence in your 3DCS models. 


Topics: 3DCS T&T Tolerance Analysis Webinar

Want to Model Faster? Easier? Join the 3DCS Essentials Series to Find Out How

3DCS Essentials Webinars: Learn To Model Faster and Easier with 3DCS for NX, Multi-CAD and CATIA

The first part of the three part 3DCS Essentials Series, this webinar focuses on setting up a 3DCS model, and some Quality of Life techniques you can use to make working on your model easier and faster.

When: September 22nd, 2016

How: Gotowebinar

What Time: 11:00 AM EST (1 hour long)

Topics: CATIA 3DCS T&T Webinar

3DCS, CATIA V5, Cache Mode and You - A How To Guide on Using Cache Mode in CATIA V5

3DCS, CATIA V5, Cache Mode and You - A How To Guide on Using Cache Mode in CATIA V5


This Tips and Tactics article walks through the use and value of using the Cache Mode tool in CATIA V5. This tool greatly increases the speed at which modelers can work on large models. 


3DCS and CATIA V5, together, offer great tools for a robust user experience. This article focuses on one of those tools, called Cache Mode. Cache Mode in CATIA V5 offers flexibility when building a Tolerance Model in 3DCS. When Cache Mode is activated, large amounts of data are stored in a local folder, reducing the overall size of an assembly. For 3DCS users, this means building and running Simulations of an entire vehicle faster. 

Topics: CATIA 3DCS T&T

Webinar October 22nd, Learn to Model Faster in 3DCS and Apply As-Built Plant and Measurement Data

How Do You Speed Up Your Modeling? Is There a Way to Use Plant and Measurement Data in Your 3DCS Model?

Thursday's webinar answers these questions, showing some best practices and tips to modeling faster and utilizing measured data in your model. 

Join the Webinar

Topics: 3DCS T&T Webinar

T&T CATIA V5 Tree Modification - How to Replace Sub-Assemblies with New Processes?

3DCS in CATIA V5 Tree Modification, Part 1





Replacing significantly modified subassemblies in CATIA

What happens when you delete and replace a subassembly with one that reflects a different process?

Many hours can be invested and lost trying to replace a heavily modified subassembly using the CATIA commands and the Tree Link Wizard.  Furthermore, this method can cause excessive loss of feature links.  The Tree Link Wizard is meant for updating the model after a single part or sub-assembly is moved or replaced.  In fact, when moving multiple sub-assemblies, Update Model and the Tree Link Wizard should be used between each step. 

This Tips and Tactics is a work around to get your subassembly with 3DCS replaced and updated without tree linking and feature linking.  If you’re just replacing the same subassembly without name or structure changes, this work around usually isn’t necessary.

With this work around, MTMs at the higher assembly levels will need to be checked and possibly corrected.  3DCS Excel export can be used to easily fill in some vacancies caused by this work around since some MTM items (Moves, Tolerances, and Measures) will likely be left with missing Object and Target points.

Topics: CATIA 3DCS T&T

T&T - Color Contour (Color Mapping) Add Visual Context to Your Dimensional Analysis

Color Contour (Color Mapping)

                    in 3DCS Variation Analyst



Color Contour (also known as Color Mapping) is a visualization tool which shows the level of variation on parts during Deviation and Simulation. It allows a user to pinpoint part and assembly tolerances, and measurements that are most critical to the assembly process.

How do I start using the tool?

        No crayons or color pencils are required but a 3DCS Variation Analysis license is needed to run 3DCS. To apply Color Contour, the user will need to locate the 3DCS Display Toolbar and activate Color Contour. Once the user activates Color Contour, Multi-CAD, CATIA V5 and 3DEXPERIENCE require a specific visualization type. This is automatically changed in the software and will produce a warning to show the user it changed. Open the Color Contour options to activate the legend.

  • To view Color Contour while in Deviation, a model requires at least one Move and one Tolerance or GD&T callout.
  • To view Color Contour in a Simulation, a model will require at least one Move, one Tolerance or GD&T and one Measure.

Note: A user can have both a Simulation window open and show Deviation by either clicking in the Graph window or the Simulation window.


Topics: 3DCS Tolerance Analysis T&T

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