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<big><u>Attendees</u><br>
Martin Hardwick, STEP Tools, USA
<br>
David Loffredo, STEP Tools, USA
<br>
Magnus Lundgren, KTH, Sweden<br>
Fred Proctor, NIST, USA
<br>
Alain Brail, AlBavis, France
<br>
Mikael Hedlind, KTH, Sweden<br>
Leon Xu, Boeing, USA
<br>
Anna Valente, ITIA-CNR, Italy<br>
Chris Pfeifer CCAT, USA<br>
David Odendahl, Boeing, USA
<br>
Sid Venkatesh, Boeing, USA<br>
Robert Dickerson, Pratt & Whitney, USA<br>
Aydin Nassehi, U.Bath, UK<br>
<br>
<u>Apologies for Absence</u><br>
Larry Maggiano, Mitutoyo, USA<br>
Ian Sroud, EPFL, Switzerand<br>
Bengt Olsson, Sandvik, Sweden
</big>
<br>
<br>
<big><font face="Times New Roman">We discussed the energy/chatter/wear
demonstration. Showing an ability to estimate the energy required to
machine a part would be technically interesting but the energy cost for
two hours of machining is typically less than five dollars so the
business case is weak. Predicting and preventing chatter is important,
but many demonstrations of the required technology have been given in
the past, and while STEP-NC makes it easier to deploy one of these
solutions, most organizations that really need one have already
developed it using proprietary techniques.<br>
<br>
A tool wear demonstration would be unique because the calculations
necessary to manage and minimize tool wear require the new information
defined by STEP-NC and ISO 13399. The as-is state of the tools that
will be used to machine a part cannot be predicted in advance, so the
necessary simulations cannot be run in advance and must be performed on
or near the machine just before a job begins. STEP-NC and ISO 13399 can
bring the required information to the machine. Therefore simulations
can be run to predict how the remaining tool wear will be consumed and
new feeds and speeds can be computed that will make optimal use of the
remaining tool life. At $200 hour the cost of tooling can be
considerable so a tool wear demonstration will be both technically
interesting and have a strong business case.</font><br>
<font color="#000000"><br>
</font><font color="#000000" face="Times New Roman"><small><span
class="755204623-16122009"></span></small></font><font color="#000000"
face="Times New Roman"><span class="755204623-16122009"><font size="-2"><big><font
size="2"><big><big>In order to run a demonstration we will need
non-proprietary tool wear test data from laboratory tests. The data we
will need is the cutting edge life of a given cutter, when cutting a
given material, under given surface speeds and feeds per tooth, and
with known radial depths of cut. The data should probably look like a
multi-dimension matrix.</big></big></font></big></font></span></font><font
color="#000000" face="Times New Roman">
<br>
<br>
</font><font color="#000000" face="Times New Roman"><span
class="755204623-16122009"><font size="-2"><big><font size="2"><big><big>We
can then read the radial depth of cut in each cutting path, and adjust
the feed per tooth (or feedrate) according to the test data matrix to
achieve a desired tool life. The concept is very similar to the
constant chip thickness method, but the feedrate adjustment will follow
the test data.</big></big></font></big></font></span></font></big>
<p><big><font color="#000000" face="Times New Roman"><span
class="755204623-16122009"><font size="-2"><big><font size="2"><big><big>To
better demon</big></big></font></big></font></span></font><font
color="#000000" face="Times New Roman"><span class="755204623-16122009"><font
size="-2"><big><font size="2"><big><big>strate the tool wear, we
should plan to cut some simple features such as those on boxy. We will
need to identify a stock material which will give us consistent tool
wear. To show audience the wear, we would like to have a cutter/stock
material combination which can produce a visible tool wear within a
reasonable time frame (not aluminum).<br>
</big></big></font></big></font></span></font></big></p>
<p><big><font color="#000000" face="Times New Roman"><span
class="755204623-16122009"><font size="-2"><big><font size="2"><big><big>We
then moved on to discussing the remote/distributed process planning
demonstration. In this demonstration we will make some modifications to
the Moldy part and then ask a remote process planning system to
generate new tool paths for the new features. STEP Tools showed a
demonstration of how to construct a new program for the moldy part that
contains a reference to the old moldy program plus two new features.
The features were then captured by an STRL and sent to the University
of Bath for process planning. <br>
</big></big></font></big></font></span></font></big></p>
<p><big><font color="#000000" face="Times New Roman"><span
class="755204623-16122009"><font size="-2"><big><font size="2"><big><big><a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/NIST/STRL_for_process_planning.pdf">ftp://ftp.steptools.com/private/NIST/STRL_for_process_planning.pdf</a><br>
</big></big></font></big></font></span></font></big></p>
<p><big><font color="#000000"><big><font face="Times New Roman"><small></small></font></big></font></big></p>
<big>The next step (pun intended) is for the University of Bath to
examine the data and determine how to create tool paths for the new
features. They plan to use a commercial CAM system to generate the
paths and a preliminary demonstration will be prepared for discussion
at the next conference call.<br>
<br>
The next call will be in three week on Wednesday January 6th because of
the Christmas shutdowns. A video recording of this call is on the ftp
site at the URL below.<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/NIST/stepmanuf_telecon_20091216.wmv">ftp://ftp.steptools.com/private/NIST/stepmanuf_telecon_20091216.wmv</a><br>
<br>
We wish everyone a Happy Christmas and a prosperous New Year.<br>
<br>
Martin Hardwick<br>
Team Leader STEP-Manufacturing<br>
<br>
Action Items<br>
----------------<br>
Leon Xu of Boeing to contact Bengt Olsson of Sandvik to request tool
wear data<br>
</big><big>Aydin Nassehi of U.Bath to prepare preliminary demonstration
of tool path generation from STRL data<br>
STEP Tools Inc., to add http addressing to STRL links so that they can
be managed over the Internet<br>
<br>
</big><big><br>
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