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Martin Hardwick, STEP Tools, USA <br>
David Loffredo, STEP Tools, USA <br>
David Odendahl, Boeing, USA <br>
Sid Venkatesh, Boeing, USA<br>
Liming Li, JSL Innovations, USA<br>
Larry Maggiano, Mitutoyo, USA<br>
Bob Ericksson, P&W, USA <br>
Thanh Huyn, Okuma, USA<br>
Ray Admire, QIFsolutions, USA<br>
John Horst, NIST, USA<br>
Gordon Shao, NIST, USA<br>
Paul Huang, ONR, USA<br>
Saur Andreas, DMG Germany<br>
Alain Brail, Airbus (retired), France <br>
Christian Callet, Datakit, France<br>
Pierre Ducheir, CIMPA, France<br>
John Bijnens, KU Leuven, Belgium <br>
Bengt Olssen, Sandvik, Sweden<br>
M.R.IT Amsterdam, Iscar, Israel<br>
Jung-Ho Cho, Hyundai, Korea<br>
Hakchul Lee, Hyundai, Korea<br>
Sergiusz Sobieski, TZ Implements, Poland<br>
<p>We reviewed the minutes of the SC4 meeting in Beijing (attached
to meeting announcement).</p>
<p>We reviewed a very impressive model for the fixture to be used by
DMG at IMTS.<br>
</p>
<p>We discussed the Implementor's Forum to be started at the Chicago
meeting in November.<br>
</p>
<p>We were challenged to give more thought to the implications for
security and copyright protection of digital twin machining
(attached to these minutes).</p>
<p>We discussed the likely low speed of the Internet at IMTS and how
to synchronize the digital twin displays.</p>
<p>We discussed the review of QIF by SC4. From the perspective of
WG15 everyone needs to understands two points<br>
</p>
<ol>
<li>Why QIF needs to be an ISO standard so it can be used across
the entire supply chain.<br>
</li>
<li>Why STEP and QIF are BOTH needed in the digital twin
manufacturing framework (ISO 23247).<br>
</li>
</ol>
The digital twin manufacturing framework needs STEP to model the
twinned products, and it needs QIF to measure their as-manufactured
quality. The technologies are different. STEP needs to archive its
data so it needs to be normalized for upward compatibility. QIF
needs to explain the reasons for a quality evaluation so it needs to
be easy to understand and process.<br>
<br>
SC4 tried and failed to meet both sets of requirements in one data
protocol when it developed AP219.<br>
<br>
STEP and QIF both need PMI and geometry so the overlap needs to be
managed. Whether this is to be done using mapping tables,
spreadsheets or implementation methods is TBD.<br>
<br>
The next meeting will be held at the regular times on June 6th.<br>
<br>
Martin Hardwick<br>
Convener Digital Manufacturing<br>
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