IIGDT World International Institute of
Geometric Dimensioning & Tolerancing
What is Dr. Hetland Saying?
Dr. Hetland is a recognized author of  informative articles in many leading publications. Below are samples of these articles, which can be viewed by selecting the page sample or the article title links.

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Medical Design December 2010 Medical Design
ASME B89.7
Measurement Uncertainty

Understanding and Economic Benefits

What is Measurement Uncertainty?

The B89.7 National Committee has published a guide to help understand and implement the Measurement Uncertainty principle. This reference guide compiles the documents available in ASME relating to Measurement Uncertainty.

Medical Design December 2010

Select Version:

Short—9 Pages
Long—18 Pages

Medical Design
Inertial Sensor Components Achieving Higher Mechanical Precision with Profile Tolerancing
December 2011

Profile Tolerancing

A commitment to precision GD&T using profile tolerancing and other geometric controls is essential for establishing a true partnership between OEMs and suppliers.

Medical Design December 2010 Medical Design
Making Sense of analytical software
December 2010

Analysis of a cylindrical feature

A critical challenge facing medical OEMs and suppliers is validating the “analytical” software that determines compliance to Rule 21 CFR Part 11 regarding mechanical drawings for components and assemblies.

OrthoTec Spring 2010 OrthoTec Logo
Providing expert insight on orthopaedic technology, development, and manufacturing
Spring 2010

Speaking a Precise Language

Orthopaedic component manufacturers should use profile tolerancing to achieve high mechanical precision.

Dr. Hetland discusses the increased complexity of surface geometries and the decreasing feature tolerances of orthopaedic components that is driving the need for unprecedented precision in product design definition.

Bonezone - Winter 2009 Bonezone Logo
Strategic Sourcing for the Orthopaedic Industry
Winter 2009

Software Validation Considerations within Medical Companies per "FDA 21 CFR PART 11"

Dr. Hetland discusses the critical challenges facing today’s medical OEMs and suppliers in validating analytical software used for determining compliance to mechanical drawings for components and assemblies. This article will make visible some of the risks and limitations in current software validation and provide direction to simplify future validation initiatives.

Bonezone - Fall 2009 Bonezone Logo
Strategic Sourcing for the Orthopaedic Industry
Fall 2009

Mechanical Precision of Medical Components Achieved with Profile Tolerancing

Dr. Hetland discusses how medical components are increasing in their complexity of surface geometries and decreasing feature tolerances, both of which are driving the need for unprecedented precision in product design.

A new way Injection Molding
February 2004

Basic Elements: Zero tolerance: A new way of looking at precision

To say we are all used to plus/minus tolerancing is a drastic understatement, yet as demands on quality rise, and many parts shrink and become more complex, our old ± may not cut it anymore.

Speak Y14.5 Twin Cities Business Monthly
November 2003

Do you speak Y14.5?

Greg Hetland does, and he's making manufacturers more competitive with it.

Technology Minnesota Technology
Summer 2003

Zero Tolerance

If Greg Hetland had his way, avoidable errors will soon be a thing of the past for manufacturers.