VarTran - Shareware software for tolerance analysis and robust design.

VarTran^® Software

Version 3.2 for Windows 95, 98, 2000, XP and NT.

What is VarTran?

VarTran is in one sense a tolerancing package. It can perform all the standard analysis including statistical tolerancing, worst-case tolerancing, and sensitivity analysis. But VarTran goes beyond the bounds of traditional tolerancing packages to address the selection of optimal targets for the inputs. This also makes VarTran a product/process optimization tool. In finding the optimal targets, VarTran considers the effects of the inputs on both the average and variation of the outputs resulting in a robust design. VarTran is also a robust design tool. Below are just some of VarTran’s capabilities:

Optimize product or process performance:
- Maximize Cpk
- Minimize percent defective
- Minimize Taguchi loss
Achieve robust designs
Statistical tolerancing
Worst-case tolerancing
Process tolerancing (a unified approach to tolerancing)
Find cause of variation (sensitivity analysis)
Handles tough nonlinear problems
Analytic methods of predicting variation that are much faster than performing simulations
Optimization routines based on interval analysis that are guaranteed to find the global optimal
Following designed experiments, use to:
- Optimize for production conditions rather than the conditions existing during the study
- Identify the root cause of the variation

State of the Art Capabilities

VarTran has many firsts. It introduces a unified approach to tolerancing called process tolerancing that incorporates both statistical and worst-case tolerancing. This allows statistical and worst-case tolerances to be mixed in the same analysis. It uses interval analysis optimization routines guaranteed of finding the global optimal. It uses analytic methods of predicting the variation, which are much faster than performing simulations. With VarTran, you can accomplish feats you never before dreamed of.

Design for Six Sigma

Many leading companies are using VarTran has key part of their Design for Six Sigma (DFSS) programs including:

Several leading consulting companies have also integrated VarTran into their Design for Six Sigma (DFSS) programs including:

Download Software - 30 Day Free Trial

VarTran is a shareware program. A full version of the software can be downloaded for a 30-day free trial. After 30 days, if you want to continue using the software, you must register it at a cost of US$495 ($534.60 for residents of Illinois). Registration entitles you to free upgrades for 1 year.

Self-Extracting File: (4,152 K)

Click the above button to download a self-extracting file. The file vta32.exe will be downloaded. Executing this file will install the software on your system including the user manual and tutorial. This is the easiest way to download and install the software on your system.

ZIP File:      (4,125 K)

Click the above button to download a ZIP file. The file vta32.zip will be downloaded. You must unzip the files contained in the ZIP file into a temporary directory and then run the program setup.exe. You must have your own software for unzipping the file.

Tutorial:   (324 K)

Click the above button to download the tutorial in pdf format. The tutorial file vta32tut.pdf is also copied onto your system as part of the installation process using the two files above. It does not need to be downloaded separately. You must have a copy of the free Adobe Acrobat Reader® to view the file.

User Manual:      (1,822 K)

Click the above button to download the user manual in pdf format. The user manual file vta32man.pdf is also copied onto your system as part of the installation process using the two files above. It does not need to be downloaded separately. You must have a copy of the free Adobe Acrobat Reader® to view the file.

VarTran runs under Windows 95, 98, 2000, XP and NT. It can be easily uninstalled. It requires 8 MB of hard disk space.

Registering Software

To continue using the software after the 30-day trial period, you must register your copy of the software at a cost of US$495 ($534.60 for residents of Illinois). You can register the software using our secure server by clicking the button. Otherwise you can register by Fax or mail using the following registration form. Also available are discounts for multiple users and site licenses.

Further Information on VarTran:

Other Information on Robust Design and Tolerance Analysis:

2-Day Seminar Robust Tolerance Analysis
Articles on Robust Design and Tolerance Analysis

VarTran® Software