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<u>Attendees</u><br>
Martin Hardwick, STEP Tools, USA
<br>
David Loffredo, STEP Tools, USA
<br>
Magnus Lundgren, KTH, Sweden<br>
Bengt Olsson, Sandvik, Sweden
<br>
Fred Proctor, NIST, USA
<br>
Alain Brail, AlBavis, France
<br>
Mikael Hedlind, KTH, Sweden<br>
Leon Xu, Boeing, USA
<br>
Larry Maggiano, Mitutoyo, USA<br>
Chris Pfeifer CCAT, USA<br>
David Odendahl, Boeing, USA
<br>
Sid Venkatesh, Boeing, USA<br>
Bob Erickson, Pratt & Whitney, USA<br>
Aydin Nassehi, U.Bath, UK<br>
Kevin Lyons, NIST, USA<br>
Alkan <font face="arial" size="2">Donmez, NIST, USA</font><br>
<br>
There was a brief demonstration of loading multiple files into the
STEP-NC Explorer. New forward and backward buttons allow you to
navigate between the AP-238 projects in memory. The current state of
each project is saved and restored using STRL's. <br>
<br>
We discussed the "energy" scenario. It was observed that at 12 cent per
kilowatt hour the maximum power consumption for a 20KW spindle costs
$2.40 for an hours machining. For most shops this cost is trivial
compared to the cost of tooling which can be as much as $200 per hour
for
some materials. Therefore, the demonstration will be more
interesting if we show how to balance cycle time and tool life. <br>
<br>
<a class="moz-txt-link-freetext"
href="ftp://ftp.steptools.com/private/NIST/Energy_Estimation.pdf">ftp://ftp.steptools.com/private/NIST/Energy_Estimation.pdf</a><br>
<br>
We discussed the information requirements for estimating tool wear.
They include knowing the material, the axial depth, the radial depth,
and the feed and speed. With this information and a knowledge of the
cutting tool, enterprises can estimate the tool wear using analysis
tools or by making lookup's in a database. These databases can be
quite extensive with the predicted wear values given for many
combinations of axial and radial depths, feeds and speeds.<br>
<br>
<a class="moz-txt-link-freetext"
href="ftp://ftp.steptools.com/private/NIST/Toolwear_Curves.ppt">ftp://ftp.steptools.com/private/NIST/Toolwear_Curves.ppt</a><br>
<br>
To make a demonstration we will need a similar database and software
that can calculate new speeds and feeds to minimize tool wear using the
axial and radial depths of each tool path in a STEP-NC data file.
AP-238 allows curves to be defined to describe the axial and radial
depth at any point in a toolpath. For this demonstration we will need
to populate these curves with data for one or more of our test parts. <br>
<br>
When a feed or speed is changed the new feed and speed and combination
may resonate on the spindle and cause excessive vibrations. These bad
feed and speed combinations are identified by tapping the tool and
spindle. Today tapping is a manual operation. For the demonstration we
may want to anticipate future automated tapping devices.<br>
<br>
The next conference call will be held at the usual times in two
weeks on December 16. The attendee limit for the next conference call
has been raised to 26 because both of the last calls reached the
previous limit (16). Discussion of the process planning scenario was
postponed until that call.<br>
<br>
<a class="moz-txt-link-freetext"
href="ftp://ftp.steptools.com/private/NIST/Toolpath_Generation.pdf">ftp://ftp.steptools.com/private/NIST/Toolpath_Generation.pdf</a><br>
<br>
A recording of the conference call is on the web site at:
<a class="moz-txt-link-freetext"
href="ftp://ftp.steptools.com/private/NIST/stepmanuf_telecon_20091202.wmv">ftp://ftp.steptools.com/private/NIST/stepmanuf_telecon_20091202.wmv</a><br>
<br>
<u>Action Items</u><br>
STEP Tools to use STRL's to link the projects in two or more STEP-NC
files.<br>
Leon Xu to outline information requirements for estimating tool wear.<br>
<br>
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