[step-manufacturing] Minutes of May 16th conference call

[Martin Hardwick]

Attendees
--------------
Martin Hardwick, STEP Tools, USA
David Loffredo, STEP Tools, USA
Mikael Hedlind, KTH, Sweden
Magnus Lundgren, KTH, Sweden
Christer Wickman, KTH, Sweden
Bengt Olsson, Sandvik, Sweden
Leon Xu, Boeing, USA
Sid Venkatesh, Boeing, USA
Fred Proctor, NIST, USA
Ronnie Fesperman, NIST, USA
Bob Erickson, Pratt & Whitney, USA
Vincent Marchini, Ameritech, USA
Alain Brail, Airbus (retired), France
Doron Cohen, ISCAR, Israel
Ian Stroud, EPFL, Switzerland

We reviewed the latest version of the STEP-NC program for machining the 
crown wheel. The machining process is close to completion and we are 
awaiting some final recommendations on best practices from Scania.

ftp://ftp.steptools.com/private/Stockholm2/May16/Crown%20Wheel%20Setup%201%20and%202%20%5B2012-05-11%5D.238

A STEP reader for measured cutting tools is being implemented for the 
840D. The new reader will be demonstrated at the June ISO meeting.

We discussed the properties in the STEP files for the cutting tools, 
machine tools and fixtures. There was some confusion over what 
properties have been implemented in the different versions of the data 
sets and we concluded that STEP Tools should give high priority to 
adding displays of this information to the STEP-NC Explorer.

We discussed the operation that will be measured to predict machining 
accuracy. The operation will have a uniform cross section for its 
cutting so it is not necessary for this information to be pre-computed 
in a machining simulation. Completion of the positional accuracy data 
necessary for predicting the machining accuracy is now the highest priority.

We discussed the distributed STEP file demonstration. The goal is to 
show how Scania might assemble a cutting tool from components supplied 
by Sandvik and ISCAR and then define a tolerance between the gauge line 
in the Sandvik holder and the tip of the ISCAR cutting component. The 
technical issue that makes this difficult is that the Scania assembly 
must reference data stored in the Sandvik and ISCAR cutting tool 
databases. This requires inter-file references and there is no agreement 
within STEP yet about how to best implement such references. Therefore, 
STEP Tools has developed the following specification that it will test 
on the cutting tool example.

ftp://ftp.steptools.com/private/Stockholm2/External_geometric_representation_items.txt

A recording of this conference call is available at the following ftp. 
The next conference call will be at 11AM Eastern on Wednesday May 23rd. 
Note the different time again.

ftp://ftp.steptools.com/private/Stockholm2/stepmanuf_telecon_20120516.wmv

Action items
1. STEP Tools to update the STEP-NC Explorer to display the semantic 
properties for the tools, fixtures and machines.
2. STEP Tools to implement its proposal for external references between 
STEP files.
3. KTH to complete the STEP-NC data for the machining process.
4. KTH to complete the positional accuracy data for its Mazak machine tool.
5. Boeing to compute the cutting forces for the measured operation.