[step-manufacturing] Minutes of conference call #14

[Martin Hardwick]

_Attendees_
Martin Hardwick, STEP Tools, USA
David Loffredo, STEP Tools, USA
Fred Proctor, NIST, USA
Leon Xu, Boeing, USA
Mikael Hedlind, KTH, Sweden
Magnus Lundgren, KTH, Sweden
Chris Pfeifer CCAT, USA
Fiona Zhao, NIST,/New Zealand
Bob Erickson, Pratt & Whitney, USA
David Odendahl, Boeing, USA
Ian Stroud, Switzerland
Bengt Olsson, Sandvik, Sweden

_Apologies for Absence_
Aydin Nassehi, U.Bath, UK
Stephen Newman, U.Bath, UK
Alain Brail, AlBavis,  France
Larry Maggiano, Mitutoyo, USA
Sid Venkatesh, Boeing, USA
Anna Valente, ITIA-CNR, Italy

We compared the seven and eight setup versions of Boxy and agreed that 
we should use the seven setup version for the demonstration.

ftp://ftp.steptools.com/private/NIST/Boxy_Part_3-Axis_Machining_7_Setups_v1.238

We discussed the requirements for fixturing each of the setups. Do the 
spacers need to have minimum dimensions? How should the axes be zero'd 
for each setup? etc. The fixture setup shown in Boxy is one way to make 
the part but many others are possible. If a shop wants to change the 
fixtures it should make a model of the new fixtures and then check to 
make sure that there will be no errors in the machining.
The datum's should be used to set the offsets.

Our goal is to make it possible to machine the part using just the data 
in an AP-238 file. In order to do so we need to document the necessary 
requirements and to give guidance on possible options. Better 
illustrations (presentation data)  may be able to make this easier along 
with options to change aspects of the fixture such as the size of the 
spacers, the position of the fixing and so on. We will discuss how to 
enhance the setup instructions and methods at the NIST meeting.

Bengt Olsson of Sandvik showed an early release of a program to create 
ISO 13399 tooling data by assembling components in a tooling station. 
The software reads STEP models of the components and creates an assembly 
and sets the corresponding tooling attributes in an ISO 13399 file. 
Versions of the data can be made at design time with the ideal 
dimensions and at run time with the actual length of the tool as defined 
by the clamping set in the tooling station.

For the demonstration we will use both ISO 13399 and AP-203 e2 data to 
document the tool requirements. Sandvik will make an ISO 13399 file 
describing the required tool attributes (stick out, shank diameter, 
cutting length) etc. Boeing will make an AP-203 e2 model showing the 
shape of the tool with the required dimensions documented using the ISO 
13399 standard terminology as presentation items on the AP-203 e2 data.

We briefly discussed the drilling and tapping operations. These are 
still set to the default values computed for the Aluminum version of 
Boxy made for the Bath meeting. Sandvik will edit the Boxy data to set 
the feeds and speeds to more appropriate values for the ISO 1.3 Steel 
(US Grade 1060) being used for this demonstration.

We reviewed the integrated machining and measurement model proposed as a 
framework for the next round of demonstrations. There was agreement that 
the Measured_workingstep entity should be useful as a way to document 
when a workingstep needs to be measured (checked). We discussed how to 
model the accuracy attributes necessary to determine if such checking is 
necessary. There was agreement that accuracy modeling is a rich domain 
with many attributes but for most practical purposes the accuracy 
requirements can be captured as +/- values for the X, Y and Z axes.

We discussed the number of tolerances measured in a measured_workingstep 
and agreed that there will be situations where many tolerances need to 
be measured.

The evaluation_workingstep was discussed and we decided it was probably 
redundant because similar concepts are already exist in the HiPP model.

The compensation_workingstep appears to be useful and should be explored 
during the next demonstration cycle.

We decided that the frequency of the conference calls should be 
increased to weekly until the demonstration takes place.

The STRL demonstration or demonstrations will be discussed on the next 
call. STEP Tools is working on a high level process planning 
demonstration. U.Bath is working on a toolpath planning demonstration. 
Ideas for other demonstrations are welcome.

The next call will be at the regular times on *Wednesday May 5*. The 
video of this call is at the address below.

ftp://ftp.steptools.com/private/NIST/stepmanuf_telecon_20100428.wmv

Martin Hardwick
Team Leader STEP-Manufacturing

Action Items
----------------
Sandvik to make ISO 13399 models for the cutting tools.
Boeing to make AP-203 e2 presentation models for the cutting tools.
Sandvik to check the machining data for the drilling workingsteps
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