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Attendees
<br>
--------------
<br>
Martin Hardwick, STEP Tools, USA
<br>
David Loffredo, STEP Tools, USA
<br>
Joe Fritz, STEP Tools, USA<br>
Mikael Hedlind, KTH, Sweden
<br>
Christer WIckman, KTH, Sweden<br>
Leon Xu, Boeing, USA
<br>
Ronnie Fesperman, NIST, USA
<br>
Fred Proctor, NIST, USA
<br>
Vincent Marchini, Ameritech, USA
<br>
Alain Brail, Airbus (retired), France
<br>
Doron Cohen, ISCAR, Israel
<br>
Bob Erickson, Pratt & Whitney, USA
<br>
Aydin Nassehi, University of Bath, UK
<br>
<br>
This was the last conference call before the June 14th demonstration
at KTH in Sweden. Any last minute registrations can go to the
following web site. The STEP Manufacturing team is staying at the
Scandic Malmen hotel.<br>
<pre wrap=""><big><big><a class="moz-txt-link-freetext" href="http://www.sis.se/sc4" moz-do-not-send="true">http://www.sis.se/sc4</a>
</big></big></pre>
<br>
We will be demonstrating how to predict machining accuracy, how to
assemble tools and fixtures from libraries, and how to build virtual
holographic factories.<br>
<br>
The conference call reviewed the action items from the previous
conference call.<br>
<br>
1. Ronnie to complete testing of the KTH ASME B59.2 data <br>
NIST has tested the AMSE B59.2 data made by KTH using their Matlab
software. Some required attributes were missing but these could all
be given default values. The most significant missing attribute
being an incline direction for non-orthogonal machines such as the
nutating DMU 70 at NIST.<br>
<br>
2. Martin to check with Doron on delivery date cutting tool item <br>
The cutting tool items were delivered to the wrong building by the
American delivery service.<br>
<br>
3. STEP Tools to process kinematics for tool changer and fixture <br>
STEP Tools gave a demonstration of the tool changer kinematics. The
cylindrical pair kinematics are not yet complete. So the part can
rotate but not move up and down. This requires an extension to the
infrastructure that is currently implemented. The individual
movements now need to be put into a sequence to complete the tool
change. The necessary data is in the STEP file and the
implementation is being given high priority. A test harness with two
sample data sets has been made available on the STEP Tools web site.<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/Stockholm2/mach-viewer.zip">ftp://ftp.steptools.com/private/Stockholm2/mach-viewer.zip</a><br>
<br>
4. KTH to add fixtures to STEP-NC data <br>
No progress was made on this item since the last telecon.<br>
<br>
5. KTH to complete tool assembly data <br>
KTH has made a cutting tool STEP file to match the word
documentation presented at the last meeting. The file is an
assembly, the mating constraints for the assembly and the cutting
dimensions for the machining process are defined by semantic
tolerances, the features and properties are classified using the ISO
13399 standard and associated to the semantic tolerances and
features.<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/Stockholm2/Cutting_tool_modeling_practice_v0_2.docx">ftp://ftp.steptools.com/private/Stockholm2/Cutting_tool_modeling_practice_v0_2.docx</a><br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/Stockholm2/T1_cutting_tool_assembly_100_AP242.stp">ftp://ftp.steptools.com/private/Stockholm2/T1_cutting_tool_assembly_100_AP242.stp</a><br>
<br>
The assembly is a single file. STEP Tools will now write
experimental software to divide this file into multiple components
that can be inserted into the cutting tool libraries of Sandvik,
ISCAR and Scania. The key requirement is to retain the semantic
tolerance information for the assembly when the underlying
components defining the constrained geometric items are in different
files.<br>
<br>
STEP Tools has updated the draft specification that it will be using
for this implementation using the feedback received from the CAX-IF.
The Monday afternoon sessions in Stockholm will examine the pros and
cons of extending the STEP file formats (Parts 21 & 28) to
better manage symbolic references between STEP files.<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/Stockholm2/Symbolically_referenced_geometric_representation_items.txt">ftp://ftp.steptools.com/private/Stockholm2/Symbolically_referenced_geometric_representation_items.txt</a><br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/Stockholm2/T24_Stockholm2_Agenda.pdf">ftp://ftp.steptools.com/private/Stockholm2/T24_Stockholm2_Agenda.pdf</a><br>
<br>
6. KTH to add additional properties to machine tool for acceleration
etc. to the machine tool model <br>
No progress was made on this item since the last telecon.<br>
<br>
7. KTH to document machine tool properties <br>
No progress was made on this item since the last telecon.<br>
<br>
8. Magnus to make force measurements for Leon's tool
force/deflection and direction prediction <br>
The first machining tests have been made and the results are being
sent to Boeing to enable the force prediction.<br>
<br>
9. Bengt to make further clarifications to cutting tool
documentation example <br>
No progress was made on this item since the last telecon. KTH needs
additional input.<br>
<br>
The team leader failed to make a recording of this conference call.
The date of the first conference call in the next series will be
broadcast using this exploder when ready. The tentative date for the
next demonstration is Thursday September 13th at the IMTS show. The
scope of this demonstration will be determined at the Stockholm
meeting. The initial thoughts are that it should involve showing the
machine tool, cutting tool and fixture vendors how to enable the
automated assembly of manufacturing solutions from data in their
libraries.<br>
<br>
Martin Hardwick<br>
Team Leader ISO STEP-Manufacturing<br>
<br>
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