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All,<br>
<br>
The regular conference call is this Wednesday (see call in data at
bottom). The proposed agenda is as follows:<br>
<br>
1. Review the merits of 7 setup Boxy verses 8 setup Boxy<br>
<br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/NIST/Boxy_Part_3-Axis_Machining_7_Setups_v1.238">ftp://ftp.steptools.com/private/NIST/Boxy_Part_3-Axis_Machining_7_Setups_v1.238</a><br>
<a class="moz-txt-link-freetext" href="ftp://ftp.steptools.com/private/NIST/Boxy_Part_3-Axis_Machining_8_Setups_v8.238">ftp://ftp.steptools.com/private/NIST/Boxy_Part_3-Axis_Machining_8_Setups_v8.238</a><br>
<br>
2. Decide required attributes for Boxy tooling<br>
<br>
Stick Out<br>
Cutting Length<br>
Shank Diameter<br>
<br>
3. Review the proposed Integrated Machining and Measurement Model
copied below:<br>
<br>
a. Validity of the basic - machine, measure, evaluate, correct - concept<br>
b. Appropriateness of the data structures (are these workingsteps or
something else)<br>
c. Necessary and sufficient for pilot testing in the next round<br>
<br>
Martin<br>
--------------------------------------------------------------------------------------------------------<br>
// Proposed extensions to STEP-NC for integrated machining and
measurement<br>
<br>
// The measured_workingstep is used to determine when the result of an
operation needs to be measured<br>
// The evaluation_workingstep is used to determine the current state of
a tolerance<br>
// The compensation_workingstep is used to correct the geometry of the
cutting tool, toolpaths or workpiece<br>
<br>
ENTITY measured_workingstep SUBTYPE OF machining_workingstep<br>
its_condition : tolerance_status;// geometric or
dimensional tolerance to be checked<br>
its_measurement_plan : workplan; // workplan to evaluate the
tolerance<br>
its_repair_plan : workplan; // workplan to repair the
error if necessary<br>
<br>
its_lower_accuracy : accuracy; // if machine is
below this accuracy then cannot make this part on this machine<br>
its_upper_accuracy : accuracy; // if machine is
above this accuracy then measurement and repair is not necessary<br>
END_ENTITY;<br>
<br>
// tolerance status links measured_workingsteps to
evaluation_workingsteps and compensation_workingsteps<br>
ENTITY tolerance_status;<br>
its_tolerance : tolerance; // geometric or
dimensional tolerance that has been evaluated<br>
its_measured_value : toleance_value; // current
(measured) value of the tolerance<br>
END_ENTITY;<br>
<br>
// workingstep to evaluate measurements<br>
// (dm_workingsteps perform the measurements - see HiPP)<br>
ENTITY evaluation_workingstep SUBTYPE of workingstep;<br>
its_operation: : tolerance_evaluation_operation;<br>
its_result : tolerance_status;// the tolerance status
set by this measurement<br>
END_ENTITY;<br>
<br>
// Tree of TBD operations that set the tolerance_status<br>
ENTITY tolerance_evaluation_operation SUPERTYPE OF (probing_methods,
gauge_methods, scanning_methods)<br>
END_ENTITY;<br>
<br>
// evaluate a tolerance using the difference between the expected and
actual values of probe points<br>
ENTITY probing_methods;<br>
<br>
// evaluate a tolerance using the different between expected and actual
surface geometries<br>
ENTITY gauge_methods;<br>
<br>
// evaluate a tolerance using the difference between expected and
actual shell models<br>
ENTITY scanning_methods;<br>
<br>
// workingstep to correct tolerance errors<br>
ENTITY compensation_workingstep SUBTYPE_OF workingstep;<br>
its_input : tolerance_status;<br>
its_multiplier : OPTIONAL REAL; // scale error
if necessary<br>
its_operation : compensation_operation; // use
error to change program, tool or workpiece<br>
END_ENTITY<br>
<br>
// Tree of TBD operations that repair the program<br>
ENTITY compensation_operation SUPERTYPE OF (toolpath_compensation,
tool_dimension_compensation, geometry_compensation);<br>
END_ENTITY;<br>
<br>
// change an axis or depth<br>
ENTITY toolpath_compenstation;<br>
<br>
// change a length, width or radius parameter<br>
ENTITY tool_dimension_compensation;<br>
<br>
// change the geometry of a workpiece<br>
ENTITY geometry_compensation;<br>
<br>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<br>
<font face="Verdana" size="1">The bi-weekly conference call is this
Wednesday
April 28 at 4:30PM France, 10:30AM Eastern and 7:30AM Western . See
below
for connection information.</font>
<br>
<br>
<font face="Verdana" size="1">1. Please join the meeting<br>
</font><a href="https://www2.gotomeeting.com/join/854925274"><font
face="Verdana" size="1">https://www2.gotomeeting.com/join/854925274</font></a><font
face="Verdana" size="1"><br>
<br>
2. Use your microphone and speakers (VoIP) - a headset is recommended.
Or, call in using your telephone.<br>
<br>
Australia: +61 (0) 8 6365 4094<br>
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United States: +1 516 453 0012<br>
Access Code: 854-925-274<br>
Audio PIN: Shown after joining the meeting<br>
<br>
Meeting ID: 854-925-274</font><br>
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