[step-manufacturing] Minutes of Renton Call #6

[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
Mikael Hedlind, KTH, Sweden
Bob Erickson, Pratt & Whitney, USA
Larry Maggiano, Mitutoyo, USA
Wen Jiang, Boeing, USA

_Apologies for Absence_
Leon Xu, Boeing, USA
Richard Zuray, Boeing, USA
Magnus Lundgren, KTH, Sweden
David Odendahl, Boeing, USA
Sid Venkatesh, Boeing, USA

We discussed the closed loop machining model. We agreed that a second  
type of workingstep needs to be added to the model so that a fixed frame 
can be defined on the tool at the start of the machining. This frame 
will then be used as a reference point for the subsequent measurements 
and compensations. We discussed the error control block. We decided that 
the summary parameters (distance moved, overall rotation) were not 
useful because they would not be used in practice. We decided that the 
reference direction a, b and c parameters should be changed to an alpha 
angle as defined by the FARO arm. We debated over whether the remaining 
rotational limits should be replaced with roll, pitch and yaw parameters 
as used in robotics. The i, j, k and alpha  parameters are more familiar 
to machinists but roll, pitch and yaw are more precise and possibly more 
appropriate because the item being measured is the location of the 
workpiece in the vise. No decision was made.

The new version of the closed loop model is on the ftp site at:

ftp://www.steptools.com/private/Renton/Closed_loop/Closed_loop_schema_20100910.pdf

The meeting invitation and registration have been posted onto the STEP 
Tools home page and can be accessed at the URL's below

http://www.steptools.com/library/stepnc/2010_renton/Fall10MeetingInvitation.doc
http://www.steptools.com/library/stepnc/2010_renton/Fall10Registration.doc

The next call will be at the regular times on Wednesday September 15. A 
meeting recording of this call is at the ftp below.
ftp://www.steptools.com/private/Renton/stepmanuf_telecon_20100908.wmv

Martin Hardwick
Team Leader
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