[step-manufacturing] Minutes of Renton Call #5

[Martin Hardwick]

  _Attendees_
Martin Hardwick, STEP Tools, USA
David Loffredo, STEP Tools, USA
Vincent Marchini, Ameritech, USA
Rich Morihara, Boeing, USA
Bengt Olsson, Sandvik, Sweden
Alain Brail, AlBavis,  France
Fred Proctor, NIST, USA
Fiona Zhao, NIST,/New Zealand
David Odendahl, Boeing, USA
Mikael Hedlind, KTH, Sweden
Sid Venkatesh, Boeing, USA
Magnus Lundgren, KTH, Sweden

_Apologies for Absence_
Leon Xu, Boeing, USA
Bob Erickson, Pratt & Whitney, USA
Larry Maggiano, Mitutoyo, USA

We discussed the requirements for closed loop machining which have now 
been documented and are available on the ftp site at the following location:

ftp://www.steptools.com/private/Renton/Closed_loop_schema_20100830.pdf

The following observations were made about the requirements.

1. It is not clear how or if the measurement_evaluation entity can 
compensate the diameters or depths of drilling holes.  The correction in 
the current measurement_evaluation entity is defined by a 
cartesian_transformation operator. A cartesian operator operator might 
be able to grow or shrink a hole attribute but even if one was built it 
would be an indirect way to modify one of these attributes.

2. The error control may need to be performed on a finer level of 
detail  than allowed by the current requirements model. For example, 
because of the origin of the fixture a large degree of change might be 
tolerable or expected for the X coordinate of a setup while only a small 
change in the Y might be allowed. Similarly, the user might want to 
closely control any changes to the orientation of the part.

3. If a tool path containing arc's is modified by a compensation then 
the radii of those arcs shall not change. If a change to the definition 
is necessary to maintain the definition of the arc when the end points 
have moved then the center point should be changed.

Completing the ARM requirements and then mapping those requirements to 
the AIM is now on the critical path because further experiments cannot 
be made with the FARO arm until the STEP-NC software is changes so that 
it can process machine frame definitions and place the measurements in 
the correct context. Therefore, continuing changes to the model were 
left to the discretion of STEP Tools and its software development 
schedule. Further changes can be discussed at the Renton meeting.

The next call will be at the regular times on Wednesday September 8.

The video recording for this weeks call is below.
ftp://www.steptools.com/private/Renton/stepmanuf_telecon_20100901.wmv

Martin Hardwick
Team Leader STEP-Manufacturing

Action Items
----------------
Martin Hardwick to continue refining the requirements model.
David Loffredo to map the requirments model into the AIM.
David Odendahl to make a STEP model of the Okuma machine tool.
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