<!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>
Sid Venkatesh, Boeing, USA<br>
Leon Xu, Boeing, USA<br>
Rich Morihara, Boeing, USA<br>
Larry Maggiano, Mitutoyo, USA<br>
Bengt Olsson, Sandvik, Sweden<br>
Magnus Lundgren, KTH, Sweden<br>
Bob Erickson, Pratt & Whitney, USA<br>
<br>
<u>Apologies for Absense</u><br>
Fred Proctor, NIST, USA <br>
Fiona Zhao, NIST,/New Zealand<br>
David Odendahl, Boeing, USA <br>
Alain Brail, AlBavis, France<br>
Mikael Hedlind, KTH, Sweden<br>
<br>
We discussed the measurement process that will be used at the
demonstration. The proposed process includes an "extra" measurement to
establish a world coordinate system for the part after the first faces
have been machined in the first setup. There was some discussion on how
to insert these coordinates into the Boxy data and it was agreed that
they should be used to define a setup for the main workplan that
contains all the other setups and workplans. In the list below this
will happen at step 4. The additional coordinate systems will then be
defined for the other setups relative to this coordinate system. For
example, in step 10 for setup 2 and subsequently for the other setups.<br>
<br>
<u>Process for measuring and generating new NC programs for Boxy.</u><br>
1. Cut Setup 1 on machine.<br>
2. Measure features on the machine to identify machine reference.<br>
3. Measure three planes on Boxy.<br>
4. Create coordinate system from planes.<br>
5. Rotate part to Setup 2.<br>
6. Measure three planes from Setup 1 on Boxy again.<br>
7. Create coordinate system from planes.<br>
8. Save file with coordinate systems relative to machine reference.<br>
9. Process file to reorient NC model.<br>
10. Generate Setup 2 program from reoriented NC model.<br>
11. Cut Setup 2 on machine.<br>
12. Repeat steps 5-10 for remaining setups.<br>
<br>
We discussed how to transfer the results of a measurement from the FARO
arm to the STEP-NC environment. We can use a text format or a CSV
format but these carry very little context data. In an exciting new
development we found that the FARO arm also exports STEP files. We
quickly made two test files. The first contains the Boxy workpiece
input given to the FARO arm and some planes measured by the arm. The
second contains the results of some corner measurements and corresponds
to the csv data in the Boxy_test files but with real geometry defined
for the planes.<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://www.steptools.com/private/Renton/Boxy_faro_output.stp">ftp://www.steptools.com/private/Renton/Boxy_faro_output.stp</a><br>
<a class="moz-txt-link-freetext" href="ftp://www.steptools.com/private/Renton/Boxy_measurements_faro_output.stp">ftp://www.steptools.com/private/Renton/Boxy_measurements_faro_output.stp</a><br>
<br>
Both files contain multiple shape representations and we will need to
determine which representation should be used to define the faces that
are to be used for the closed loop machining compensation.<br>
<br>
We discussed the schema for the closed loop information model. Two
changes have been made since the last call.<br>
<a class="moz-txt-link-freetext" href="ftp://www.steptools.com/private/Renton/Closed_loop_model.txt">ftp://www.steptools.com/private/Renton/Closed_loop_model.txt</a><br>
<br>
1. The measurement_workingstep has been divided into a
measurement_execution_workingstep that will get/create the measurement
data and a measurement evaluation workingstep that will evaluate the
measurement data to create the geometry needed for a compensation.<br>
<br>
In the demonstration we will use the measurement_execution_workingstep
to get the measurement data from the FARO arm and the
measurement_evaluation_workingstep to create an axis2_placement_3d
entity from the 3 planes created by the arm. The axis2_placement_3d
will then be used to define the new setup.<br>
<br>
2. To make it easier to understand, the compensation_workingstep has
been enlarged to include more of the data that was previously in
sub-entities. The workingstep now has three main attributes: a set of
items to be corrected, a measurement defining an error that needs to be
corrected, and an operation that determines how much of the error is to
be corrected in this step.<br>
<br>
The next call will be at the regular times on Wednesday August 25.<br>
<br>
The video recording for this weeks call includes images of the data
returned by the FARO arm.<br>
<a class="moz-txt-link-freetext" href="ftp://www.steptools.com/private/Renton/stepmanuf_telecon_20100818.wmv">ftp://www.steptools.com/private/Renton/stepmanuf_telecon_20100818.wmv</a><br>
<br>
Written at 30,000 feet using an Airplane WiFi and respectfully
submitted by<br>
<br>
Martin Hardwick<br>
Team Leader STEP-Manufacturing<br>
<br>
Action Items<br>
----------------<br>
Rich Morihara and Martin Hardwick to investigate the options available
for STEP output from the FARO arm<br>
Martin Hardwick to "stress test" the closed loop machining model using
the process proposed for the demonstration<br>
David Loffredo to map the closed loop machining model into the AP-238
AIM<br>
<br>
</body>
</html>