<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
</head>
<body bgcolor="#ffffff" text="#000000">
<u>Attendees</u><br>
Martin Hardwick, STEP Tools, USA <br>
David Loffredo, STEP Tools, USA <br>
Vincent Marchini, Ameritech, USA<br>
Rich Morihara, Boeing, USA<br>
Bengt Olsson, Sandvik, Sweden<br>
Alain Brail, AlBavis, France<br>
Fred Proctor, NIST, USA <br>
Fiona Zhao, NIST,/New Zealand<br>
Mikael Hedlind, KTH, Sweden<br>
Bob Erickson, Pratt & Whitney, USA<br>
Larry Maggiano, Mitutoyo, USA<br>
Wen Jiang, Boeing, USA<br>
<br>
<u>Apologies for Absence</u><br>
Leon Xu, Boeing, USA<br>
Richard Zuray, Boeing, USA<br>
Magnus Lundgren, KTH, Sweden<br>
David Odendahl, Boeing, USA <br>
Sid Venkatesh, Boeing, USA<br>
<br>
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.<br>
<br>
The new version of the closed loop model is on the ftp site at:<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://www.steptools.com/private/Renton/Closed_loop/Closed_loop_schema_20100910.pdf">ftp://www.steptools.com/private/Renton/Closed_loop/Closed_loop_schema_20100910.pdf</a><br>
<br>
The meeting invitation and registration have been posted onto the
STEP Tools home page and can be accessed at the URL's below<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.steptools.com/library/stepnc/2010_renton/Fall10MeetingInvitation.doc">http://www.steptools.com/library/stepnc/2010_renton/Fall10MeetingInvitation.doc</a><br>
<a class="moz-txt-link-freetext" href="http://www.steptools.com/library/stepnc/2010_renton/Fall10Registration.doc">http://www.steptools.com/library/stepnc/2010_renton/Fall10Registration.doc</a><br>
<br>
The next call will be at the regular times on Wednesday September
15. A meeting recording of this call is at the ftp below.<br>
<a class="moz-txt-link-freetext" href="ftp://www.steptools.com/private/Renton/stepmanuf_telecon_20100908.wmv">ftp://www.steptools.com/private/Renton/stepmanuf_telecon_20100908.wmv</a><br>
<br>
Martin Hardwick<br>
Team Leader<br>
</body>
</html>