[step-manufacturing] Conference call this Wednesday

[Martin Hardwick]

All,

The regular conference call is this Wednesday (see call in data at 
bottom). The proposed agenda is as follows:

1. Review the merits of 7 setup Boxy verses 8 setup Boxy

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_8_Setups_v8.238

2. Decide required attributes for Boxy tooling

Stick Out
Cutting Length
Shank Diameter

3. Review the proposed Integrated Machining and Measurement Model copied 
below:

a. Validity of the basic - machine, measure, evaluate, correct - concept
b. Appropriateness of the data structures (are these workingsteps or 
something else)
c. Necessary and sufficient for pilot testing in the next round

Martin
--------------------------------------------------------------------------------------------------------
// Proposed extensions to STEP-NC for integrated machining and measurement

// The measured_workingstep is used to determine when the result of an 
operation needs to be measured
// The evaluation_workingstep is used to determine the current state of 
a tolerance
// The compensation_workingstep is used to correct the geometry of the 
cutting tool, toolpaths or workpiece

ENTITY measured_workingstep SUBTYPE OF machining_workingstep
     its_condition            : tolerance_status;// geometric or 
dimensional tolerance to be checked
     its_measurement_plan     : workplan;    // workplan to evaluate the 
tolerance
     its_repair_plan         : workplan;    // workplan to repair the 
error if necessary

     its_lower_accuracy       : accuracy;          // if machine is 
below this accuracy then cannot make this part on this machine
     its_upper_accuracy       : accuracy;           // if machine is 
above this accuracy then measurement and repair is not necessary
END_ENTITY;

// tolerance status links measured_workingsteps to 
evaluation_workingsteps and compensation_workingsteps
ENTITY tolerance_status;
     its_tolerance            : tolerance;       // geometric or 
dimensional tolerance that has been evaluated
     its_measured_value         : toleance_value;    // current 
(measured) value of the tolerance
END_ENTITY;

// workingstep to evaluate measurements
// (dm_workingsteps perform the measurements - see HiPP)
ENTITY evaluation_workingstep SUBTYPE of workingstep;
     its_operation:         : tolerance_evaluation_operation;
     its_result             : tolerance_status;// the tolerance status 
set by this measurement
END_ENTITY;

// Tree of TBD operations that set the tolerance_status
ENTITY tolerance_evaluation_operation SUPERTYPE OF (probing_methods, 
gauge_methods, scanning_methods)
END_ENTITY;

// evaluate a tolerance using the difference between the expected and 
actual values of probe points
ENTITY probing_methods;

// evaluate a tolerance using the different between expected and actual 
surface geometries
ENTITY gauge_methods;

// evaluate a tolerance using the difference between expected and actual 
shell models
ENTITY scanning_methods;

// workingstep to correct tolerance errors
ENTITY compensation_workingstep SUBTYPE_OF workingstep;
      its_input             : tolerance_status;
      its_multiplier         : OPTIONAL REAL;            // scale error 
if necessary
      its_operation         : compensation_operation;        // use 
error to change program, tool or workpiece
END_ENTITY

// Tree of TBD operations that repair the program
ENTITY compensation_operation SUPERTYPE OF (toolpath_compensation, 
tool_dimension_compensation, geometry_compensation);
END_ENTITY;

// change an axis or depth
ENTITY toolpath_compenstation;

// change a length, width or radius parameter
ENTITY tool_dimension_compensation;

// change the geometry of a workpiece
ENTITY geometry_compensation;

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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.

1.  Please join the meeting
https://www2.gotomeeting.com/join/854925274

2.  Use your microphone and speakers (VoIP) - a headset is recommended. 
  Or, call in using your telephone.

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Access Code: 854-925-274
Audio PIN: Shown after joining the meeting

Meeting ID: 854-925-274
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