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Jennifer Herron
Jennifer Herron
Jennifer Herron is the owner of Action Engineering, a company that specializes in the promotion, process development, and standardization of a 3D CAD Model-Based Environment. Her career has been spent creating and building complex hardware systems for the aerospace and defense industry, her … More »

Neutral CAD Files have benefits (Part 2) – 3D PDF and STEP

March 20th, 2014 by Jennifer Herron

Neutral CAD files are great, but remember the source of that neutral file.

The most common and ubiquitous file format used to communicate product design and manufacturing requirements is to generate a 2D pdf from the native CAD drawing. Consider that this communication method generates a digital file that is a neutral derivative of the 2D Native CAD drawing, which is a derivative of the 3D CAD model.

Derivative: Data duplicated or extracted from the original. A copy of a derivative is also a derivative. (ASME Y14.41 (R2012), 3.11)

A “neutral” 2D PDF drawing is actually a 2nd derivative of the Native CAD model.

Most likely your organization is already using some form of neutral files already, what makes it more interesting and data rich, is adding in the third dimension to your product definition.

A great forum for sharing model-based projects is the MBE Summit jointly hosted by NIST and the DOD. The past summit held in December 2013 has plenty of reference to neutral CAD formats.

J.B.’s Notes – MBE Summit 2013

There is quite a bit of activity happening using neutral formats such as STEP and 3D PDF to enable Model-Based Product Definition (MBD).

Here is my summary from the presentations given in December 2013 and available online for download here:

  • Cost of Current TDP (Technical Data Package) Challenges to NAVAIR: Annual costs associated with the TDP Challenges, Single Platform Single Business Site:

1. $1,526K Scraping Parts Manufactured due to incorrect technical data

2. $5,393K Reverse Engineering

3. $727K Translation/Healing

4. $1,965K Conversion from 2D to 3D and 3D to 2D

 (Data source: “TECHNICAL DATA PACKAGE STANDARDIZATION / IMPROVEMENT EFFORTS” – 16 Dec 2013, NAVAIR Head Quarters, Howard Owens / Brent Gordon)

MBSE (Model Based Systems Engineering) – A formalized application of modeling to support system requirements, design, analysis, technical management, verification and validation activities beginning in the conceptual design phase and continuing throughout development and later life cycle phases. (17 SE Processes 7123)

MBE (Model Based Engineering) – An approach to engineering that uses models as an integral part of the technical baseline that includes requirements, analysis, design, implementation, and verification of a capability, system and/or product throughout the acquisition life cycle. (NDIA M&S)

MBD (Model Based Design) – Mathematical and visual method of addressing problems associated with designing complex control signal processing and communication systems

MBPC (Model Based Project Control) – A formalized application of modeling to support schedule, budget, organizational activities related to the system(s) of interest.

MBMO (Model Based Manufacturing and Operations) – A formalized application of modeling to support manufacturing and operations

  • MBE Metrics: Historical data for cost savings is showing a range of 40%-50%

Graphic source: U.S. Army RDECOM “Net-Centric Model Based Enterprise” – 19 December 2013 – Armament Research Development & Engineering Center, Adam Frey

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