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Math Data Validation and Auto-Correction at GM using NX Check-Mate. Ubaid U Rehman General Motors. Abstract. This presentation will discuss: The usage of Check-Mate profiles for checking CAD data for conformance to GM Math Data Quality (GM MDQ) and Drafting Standards, and

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math data validation and auto correction at gm using nx check mate

Math Data Validation and Auto-Correction at GM using NX Check-Mate

Ubaid U Rehman

General Motors

abstract
Abstract

This presentation will discuss:

The usage of Check-Mate profiles for checking CAD data for conformance to GM Math Data Quality (GM MDQ) and Drafting Standards, and

If non-conformances occur, then auto-correct the non-conformances using GM Standards

2

general motors validation facts
General Motors Validation Facts

Check-Mate as globally agreed upon CAD validation tool

Successfully implemented Check-Mate at all GM Global Sites

Enforced 53 Check-Mate Checkers as part of GM workflow

Check-Mate used as CAD Data Assessment Tool

More than 200,000 NX parts assessed weekly using check-mate batch mode

Significant improvement in Math data quality

problem statement
Problem Statement

GM wastes time and money every year due to rework of improper data quality of it’s math files

A large percentage of these problems are caused by non-conformances to GM Math Data Quality (GM MDQ) and Drafting Standards

4

math data quality validation
Math Data Quality Validation

GM is using NX Check-Mate checkers and profiles to check CAD data quality for their adherence to GM standards

Checkers compare the math model to standards and report details that are out of standards

5

math data quality validation1
Math Data Quality Validation

After error detection, issues are fixed manually

Manual corrections still cost time and, hence, money

6

gm inquire tool
GM Inquire Tool

Custom Inquire Tool is used

For searching different object types

To get object information

To highlight/un-highlight

To move objects to different layers

7

gm preparation tool
GM Preparation Tool
  • Preparation tool is used
    • To switch views to wireframe mode
    • Un-blank objects
    • Fit and Orient Views
    • To position WCS to ACS
    • Sets a flag so that preparation becomes part of workflow
    • Execute part clean-up
need of global math data preparation auto correction tool
Need of Global Math Data Preparation/Auto-Correction Tool

Currently considering combining validation and error corrections in one tool

Check-Mate or separate auto-correction tool?

Eliminate running multiple tools (Inquire and Preparation Tool)

Maintain and enhance one tool only

Cost savings

But with auto-corrections, there is always a big question:

What is safe to auto correct? 

9

auto correction categories
Low Risks

Non Topological

Mostly related to object properties (File Structure)

Layer

Color

Display

Drawing Standards

Part and Object Attributes

View Orientation

High Risks

Modifies Topology

Updates Physical Properties (Mass,Material)

Product and Manufacturing Information

Auto Correction Categories
auto correcting in modeling
Auto-Correcting in Modeling

Low Risk

  • Auto Correcting in Modeling mode
    • Organizing modeling object types
      • Layer / Category
      • Layer / Entity
      • Entity / Color
    • Model View Display
    • Attributes
    • Object Display Properties
      • Blank/Un-Blank
      • Faces U-V Grids
    • Non Persistent Customer Defaults
auto correcting drawing files
Auto-Correcting Drawing Files

Low Risk

  • Auto Correcting Drawing Entities as per Drawing Standards
    • Dimension Style
    • Text Preferences
    • Centerline Style
    • Section Line Style
    • Standard Drawing Notes
    • Standard Symbols

Drawing

12

auto corrections math data
Auto-Corrections Math Data

Design-critical geometry that can affect the design intent of the original model

Auto-correcting draft on ribs

Hole position

Part Clean-up

Solid Body Physical Properties

Auto midsurface generation

Product and Manufacturing related

information

High Risk

13

gm s auto corrections strategy
GM’s Auto-Corrections Strategy

GM’s strategy for auto-corrections:

For low risk errors

Check-Mate checkers will be allowed to fix problems automatically, with intervention from a designer

For high risk errors

Manual corrections to make sure changes won't affect design intent

14