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Math Data Validation and Auto-Correction at GM using NX Check-Mate
Ubaid U Rehman
General Motors
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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
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
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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
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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
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Math Data Quality Validation
After error detection, issues are fixed manually
Manual corrections still cost time and, hence, money
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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
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
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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?
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-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
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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
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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
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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
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Auto-Corrections Strategy
DEMO
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Thank You
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