GD&T Seminar Series
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GD&T Seminars |
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IIGDT has developed a multi-step Geometric
Dimensioning and Tolerancing Seminar Series built upon
years of proven experience in training new users in the
fundamental to advanced topics of GD&T. Whether you are
new, or an experienced user of GD&T, there is a Seminar
level designed for you.
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Click here to visit the GD&T Seminar home page |
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The precision language of profile tolerancing is
explicitly defined in the ASME Y14.5M-1994 Standard on
Dimensioning and Tolerancing, and is mathematically
complimented by the ASME Y14.5.1M-1994 Standard on
Mathematical Definition of Dimensioning and Tolerancing
Principles. Both of these Standards form the basis for
precise definition of complex surface boundaries and
should be the basis for 3D tolerance analysis for
designers and also for 3D precision measurement analysis
for physical metrologists. |
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3D Engineering Drawing Example per ASME Y14.41-2003 |
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Complex Surface Analysis using SmartProfileTM Software |
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Criteria for Precision Measurement |
Precision measurement requires high confidence that
the measured results reflect differences between parts
and not differences due to errors of measurement. IIGDT
Seminars
accomplish this, by demonstrating to the metrologist the
following:
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Clear definition of the specification
requirements per ASME Y14.5M-1994 or applicable
standard.
- 3D surface geometries to be
defined using profile tolerancing.
- 3D axes control to be
defined using position tolerancing.
- Qualified metrologists perform the required
tasks at a sufficient level utilizing the proper
measurement instruments, sensors, procedures and
software.
- This knowledge base must
start with a clear understanding of the
applicable standards and be solidified with high
competency in precision measurement, including
in-depth knowledge on the measurement
instruments, sensors, procedures, analytical
software and statistical analysis methods.
- Precise measurement instrument capable of
measuring the feature.
- Placed in an environment conducive to the
level of precision measurement required.
- 3D Parts require 3D measurement unless
otherwise defined per engineering
specifications. Anything less should be
considered a rough check and does not have the
ability to ensure full compliance to stated
engineering requirements.
- Sound measurement procedure that will ensure
true characterization of the feature.
- Holding fixture and devices as defined per
the engineering specifications.
- Sufficient point densities to ensure
positive characterization of the feature. Point
densities are critical to characterizing the
total manufacturing variation, and it is
insufficient to take minimal points if the
metrologist does not have previous knowledge of
the part or process to justify a reduction in
points taken on the surface.
- Robust measurement software capable of
completing the analysis per the defined standards
such as ASME Y14.5M-1994 and ASME Y14.5.1M-1994 or
other applicable standards.
- Software such as SmartProfileTM developed by Kotem Technologies that
defaults to the ASME Y14.5.1 Standard. This software
has been extensively tested with mathematically
defined datasets for Profile and Position
Tolerancing with and without datums and fully
invoking the rule of simultaneity.
- A word of
caution: The majority of coordinate measuring
machines (CMM) software used in all industries
currently default to using least-squares fitting
algorithms, which simply means they are averaging
the measured results.
- Proper analytical methods for evaluating the
uncertainty of the measured results. ASME B89.7.3.2
technical report provides Guidelines for the
Evaluation of Dimensional Measurement Uncertainty
and is a simplified guide for metrologists to
evaluate all the contributing factors that influence
the measured result.
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IIGDT Seminars |
IIGDT offers 4 levels of training courses to suite your
business requirements. These are:
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GD&T Chart: |
Bring some of the classroom into your inspection room. The GD&T Chart provides guidance and examples to view everyday,
click here:
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Announcements: |
Upcoming Seminars:
October 12-13 Optical Gaging Products Wilsonville, OR
October 15-16 Productivity Quality Inc. Plymouth, MN
October 19-20 Optical Gaging Products Santa Clara, CA
October 22-23 Optical Gaging Products Ambler, PA
October 26-27 Optical Gaging Products Salt Lake City, UT
October 29-30 Optical Gaging Products St Louis, MO
November 2-6 University of Minnesota St Paul, MN
To see our complete listing please visit the Seminar Schedule
page, click here:
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Read about Dr.
Hetland's contribution to BoneZone regarding GD&T and
it's application focused on the medical component
industry,
click here. |
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BONEZONE
Archives |
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