GD&T Chart per ASME Y14.5M-1994 History |
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In 1984, Dr. Hetland was contracted to train a
core group of upper-level management representing design,
metrology, manufacturing and tooling. The Company's training
objective was to provide geometric dimensioning & tolerancing
(GD&T) users with higher competencies and with emphasis placed
on harmonization of GD&T across all departments to achieve
highest production efficiency. This initiative was brought forth
by acknowledging the criticality of doing projects right the
first time.
“On-site” training was facilitated in a dedicated room of
average size, with a unique whiteboard that encompassed the
perimeter of the room. The training was highly interactive due
to the involvement of many participants with different reference
experiences of GD&T based on their past training, personal
utilization, various competency levels and spanning multiple
departments.
Dr. Hetland's training involved specific discussion covering the
13 geometric symbols (per ANSI Y14.5M-1982), their optimum place
of utilization and their restrictions. Many participants raised
questions in need of clarification of meaning, application and
relationship of each symbol, resulting in whiteboard examples
showing each of their symbols and derived boundaries.
The training concluded with participants performing a 360-degree
gradual recap of facts and reinforcements of Dr. Hetland's
examples, showing amazement by the magnitude of information
covered in a few short days and acknowledged their unprecedented
comprehension of the symbols and progressive graphical
representation of derived boundaries. Most rewarding to Dr.
Hetland was when many of the participants turned to him and
said, “I finally get it.”
That evening Dr. Hetland realized there was merit in a reference
tool that captured the “whiteboard” information and that such a
tool could also benefit other companies seeking similar
solutions. Hence, the original GD&T Chart was created.
Today, Dr. Hetland has shown thousands of new and experienced
users the power of optimum utilization and integration of GD&T,
resulting in higher precision in interpretation and application
of GD&T across all disciplines. Paradigm shifts have occurred
from a moderate consideration of GD&T to becoming the highest
value-add priority. Companies around the world today use the
GD&T chart for sanity checks, quick reference, student
reinforcement and problem solving.
Dr. Hetland continues his pursuit of higher precision and global
simplification, which has resulted in taking the now 14
geometric symbols down to 3. Imagine!
These proven symbols are now the only ones needed to design, tool,
manufacture and measure components and assemblies while
complementing the highest of quality systems. These strategic
breakthrough findings are fully covered in Dr. Hetland's newly
launched series of public and onsite
courses. See the Seminar section
of the IIGDT website for course
details.
Charts may be purchased online, click here. |