Engineering Talk - DCS's Blog on Quality and Engineering

3 Tools to Tackle Tough Tolerance Negotiations - Using Data to Support Tolerance Changes

3 Tools to Support Tough Tolerance Negotiations 

DCS Solutions offer a number of tools to support your tolerance discussions with customers. 

Tolerance Negotiations are never easy. Customers will try to hold their suppliers to difficult or over-engineered tolerances, or simply don't know that certain tolerances can be opened without affecting the assembly quality, or need to be opened (increased) in order to keep costs reasonable. 

DCS provides 3 tools to support tolerance negotiation by using data to back up tolerance change requests: 

1. Tolerance Negotiator -- QDM Analyst Tool

2. 3DCS Variation Analyst Simulation Results

3. QDM Management Reports 

 

1. Tolerance Negotiator - QDM Analyst Tool 

How do I get it?

Tolerance Negotiator is built into the base QDM Analyst software, without the need for add-ons or additional purchases. If you have QDM Analyst, the standalone QDM template maker software, you have Tolerance Negotiator. 

Using Tolerance Negotiator

Tolerance Negotiator is under the Tools tab of QDM Analyst. 

After clicking Tolerance Negotiator, a table with all of the imported data measurements is generated.

Two types of data are usually used in Tolerance Negotiator.

Plant and Measured Data can be imported from any inspection device and used to demonstrate production tolerances and metrics. Suppliers use the first 30 parts in a production line, or prototype measurements to demonstrate measured values and whether they are meeting or failing to meet statistical objectives (Pp or Cp). 

Simulation data from an analysis tool can also be used before production. As a DCS Software, QDM is already configured to utilize 3DCS data. Importing 3DCS simulation results can show the risk of failure for given objectives. 

Tolerance Negotiator gives two sets of values:

1. Tolerance changes required to meet given Cp / Pp objectives

2. How Tolerance changes affect Cp and Pp 

This lets the user change tolerances, values and objectives and instantly see the results. For example, if your customer gave a required Pp of 1.33, you can show which tolerances in the provided design can actually meet that objective. With 3DCS, you can demonstrate how 3D stack ups affect those tolerances and further determine the final Pp or Cp values, and may affect the final range of variation. 

Tolerance Negotiator Demonstration

The video below demonstrates how the use of Tolerance Negotiator:

 

2. 3DCS Variation Analyst Simulation Results

3DCS Variation Analyst simulates assembly builds across a normal distribution (default) using Monte Carlo Simulation. Incorporating part tolerances and assembly processes, 3DCS provides outputs of simulated measurements that include the 3 dimensional variation stack of all parts and processes in the model. 

The results are the measured results of hundreds or thousands of virtual product builds compiled and analyzed statistically. Beneath the simulation results are the sensitivity results, which include the largest contributing tolerances to the given measure. 

In the simulation results window, upper and lower specification limits can be dragged to adjust and see the statistical outputs, Cp and Pp, change accordingly. It also demonstrates the expected failure rate for each given measurement with its given specification limits. This information can be valuable in showing the risk of build failure for each feature based on current design specifications, and how changes can affect either the Cp/Pp or the risk of failure. Adjusting a tolerance and re-running the analysis can show the change to the simulation results and whether an adjustment will positively or negatively affect the model outputs. 

Here is a video example of one method of how 3DCS simulation results can be used for tolerance negotiation: 

 

3. QDM Management Reports

QDM Management Reports are an effective way to present results to managers and business leaders. They summarize and display simulation or production results, giving visual context and information to make it easy to understand the content. 

Within the reports, as part of tolerance negotiation, a user can set specification limits or pass/fail criteria and color coding to show whether given measurements passed or failed inspection. 

This is a good way to show simulation results from 3DCS or production data in QDM and whether those simulation results will meet quality expectations. It can be helpful for pointing out trouble areas and leading into a tolerance negotiation on resolutions for those given measurements and tolerances. 

Learn more about Tolerance Negotiation and Supplier Quality with Supplier Quality for Suppliers Webinar - FREE On-Demand 

Click to View the Webinar

Topics: PTC Creo 3DCS Creo Siemens NX QDM Webinar CATIA V6 SPC Tolerance Analysis 3DCS CATIA

Webinar Nov 29 - Supplier Quality...For Suppliers - Learn How a Connected Quality System Helps Suppliers Meet Market Demands

Setting Up Supplier Quality Assurance for Tier 1 Suppliers

Many Tier 1 Suppliers support different customers with different expectations and needs. A well implemented quality assurance system can make it easy to meet these different expectations, with monitoring, communication and problem solving built in to the system. 

In today's demanding automotive marketplace, OEMs rely on large Tier One suppliers for major systems across vehicle platforms.  This in turn has put the onus of validating parts on the Tier One.  OEMs demand high quality systems - Tier Ones have to demand high quality parts from their supply base to put into those systems.

Topics: QDM Webinar SPC Press Release

Digital GD&T Webinars Part 2 and 3 Now Available On-Demand

 

Topics: PTC Creo 3DCS Creo Siemens NX QDM Webinar CATIA V6 SPC Tolerance Analysis 3DCS CATIA

DCS at IMTS 2018 - Showcasing Closed Loop Manufacturing

DCS Showcases Closed Loop Manufacturing at IMTS 2018 - Connecting CAD and SPC Systems

Using CAD to create measurement plans, and feeding measurement data back into the CAD model closes the loop on quality

DCS Vice President of Sales, Donald Jasurda, works with Chris Peuterbaugh, DCS Project Coordinator, to demonstrate integrated tolerance analysis and its connection to QDM SPC Software. 

Topics: Siemens NX SPC Tolerance Analysis CATIA V6 CATIA 3DCS QDM

Dimensional Control Systems Combines CAD and SPC Software to Deliver Closed Loop Manufacturing at IMTS 2018

Dimensional Control Systems Combines CAD and SPC Software to Deliver Closed Loop Manufacturing at IMTS 2018

Dimensional Control Systems shows how Closed Loop connects CAD design with SPC measurement automation and supplier quality

Dimensional Control Systems (DCS), a quality software solutions provider,  will be showcasing successes in Closed Loop Manufacturing at the 2018 International Manufacturing Technology Show (IMTS) in Chicago Illinois, September10-15, 2018. The event will be held at the McCormick Place in downtown Chicago, along with eight other co-located events bringing together over one hundred thousand manufacturing and quality professionals from across the world.

Topics: Press Release 3DCS Creo PTC Creo Siemens NX QDM CATIA V6 CATIA 3DCS Tolerance Analysis SPC

Defects Per Million Opportunities (DPMO) and Z Scores -- Diving into the Six-Sigma Rabbit Hole

Six-Sigma Programs - Using Defects Per Million Opportunities in 3DCS 

Defects Per Million Opportunities (DPMO) is a very important criterion used in Six Sigma programs as an objective and determinant for success or failure. How does DPMO relate and benefit Tolerance Analysis? 

Based on discussions and articles in the DCS Community - Register FREE to learn more

Topics: T&T Tolerance Analysis 3DCS CATIA 3DCS Creo Siemens NX SPC

How Do You Create Actionable Information for Decision Making from Your Monte Carlo Analysis?

Your Monte Carlo Analysis Results Give Actionable Information - How Do You Share and Use That Data in a Meaningful Way?

Monte Carlo Analysis, using Monte Carlo simulation with tolerance variables and assembly processes, provides a lot of powerful outputs. Determining percent out of specification, critical features to quality, contributing parts and tolerances to out-of-spec scenarios, and more. These outputs can be used to reduce non-conformance in production, and thereby reduce scrap, rework and overall manufacturing costs. 

As anyone who has worked in the simulation environment knows, that's the goal. However, getting there isn't always easy. Most teams responsible for creating simulations then provide that data to managers, quality professionals, plant managers, designers and other teams that have to use that data to make changes and decisions. 

Topics: QDM Webinar SPC Tolerance Analysis 3DCS

Webinar: Use 3DCS to Feed Downstream Applications, CMM's and Inspection Planning

Webinar

Use 3DCS to Promote Downstream Applications and Inspection Planning

Don’t miss part 3 of the 3DCS Version 7.5 Webinar Series

In the next part of the Version 7.5 series, learn how to utilize your 3DCS model to accomplish a number of tasks and downstream applications such as:

  • Measurement Plan Authoring
  • CMM Routine Creation
  • Management Report Generation
  • Alignment of Supplier Quality 
  • Comparator Reports - Measured vs. Simulated
  • Tolerance Negotiation

 

Topics: QDM SPC Tolerance Analysis 3DCS Webinar

Closed Loop Manufacturing - Step 1- Perceived Quality & Tolerance Objectives

Closed Loop Manufacturing - Perceived Quality & Tolerance Objectives

Take advantage of variation analysis and high-end visualization to determine the impact of design specifications on your product's appearance. 

What is Perceived Quality? 

Topics: SPC 3DCS Perceived Quality Tolerance Analysis

4 Reasons to Do Closed Loop Manufacturing

Why Does Anyone Want to Close the Loop?

Applying Closed Loop Manufacturing gives companies a powerful set of tools to improve quality.

What is Closed Loop? Click Here to find out!

Topics: Tolerance Analysis SPC 3DCS QDM