[step-manufacturing] Minutes of October 21 conference call

[Martin Hardwick]

Attendees
Martin Hardwick, STEP Tools, USA
David Loffredo, STEP Tools, USA
Vincent Marchini, Ameritech, USA
Aydin Nassehi, University of Bath, UK
Mikael Hedlind, KTH, Sweden
Fred Proctor, NIST, USA
David Odendahl, Boeing, USA
Sid Venkatesh, Boeing, USA
Bengt Olsson, Sandvik, Sweden
Richard Zuray, Boeing

Apologies for absence
Ronnie Fesperman, NIST, USA

1. We discussed the Long Term Archiving Project. They are in the process 
of migrating the STEP from AP-203 and AP-214 to the unified model in 
AP-242. The new application protocol is on a fast track to 
standardization and code to import and export data defined by the model 
is being developed by the major CAD vendors. The project had created 
example data sets in all of the major CAD systems. These data sets 
illustrate different scenarios and applications for geometric tolerance 
and dimension data and will be used to test the new translators.

ftp://ftp.steptools.com/private/Undecided/LOTAR_STEP_NC_Pres.pptx

An update to the kinematics model (Part 105) is included in the scope of 
AP-242 (see minutes of last telecon). A new external reference method is 
also in the scope and a demonstration is being planned for December that 
combines the two extensions.

2. We discussed enabling CAM data exchange.

ISO 14649 has different conformance classes to AP-238. These classes are 
fixed by the range of geometry and topology that can be included in the 
model and do not correspond to any of the subsets recognized by STEP.

ftp://ftp.steptools.com/private/Undecided/Aydin_sc4-slides2.pdf

In AP-238 CC3 defines a conformance class with operations, features and 
shapes, and CC4 defines a conformance class that adds geometric 
dimensions and tolerances to CC3. Therefore, CC3 applies to traditional 
CAM systems and CC4 applies to the new CAM systems anticipated for a 
near future in which product models include GD&T information.

STEP Tools has implemented a CC3  export tool for Mastercam. This tool 
was used to generate process data for some of the test parts on the STEP 
Tools web site. However, the data is voluminous so a request was made 
for simpler test parts to enable staged implementation of the translators.

3. Mikael Hedlind gave a brief demonstration of how to represent 
different views of cutting tool data in STEP

A cutting tool may have multiple representations. One representation may 
be a complete solid model, another representation may show only external 
details, and a third representation may describe just the cutting 
profile for simulation systems.

A recording of this conference call is on the ftp site.  The next 
conference call will be at the regular times on November 4.

ftp://ftp.steptools.com/private/Undecided/stepmanuf_telecon_20111021.wmv

Martin Hardwick
Team Leader

Action items
----------------
1. Rick Zuray to provide STEP files for the LOTAR test parts.
2. Bengt Olsson to lend the ISO International Standard specification for 
AP-238 to U.Bath
3. Fred Proctor to investigate how to create process test files for 
STEP-NC similar in concept to the GD&T test files made by LOTAR