Your E-mail and Presentation "Machining features and Machinin g Process Features"
Alan Crawford
alc at lsc.co.uk
Fri Jan 11 12:38:39 EST 2002
All
Looking at the feedback from the original set of slides, we have heard several opinions about what is required to migrate between the AP224 design information and the machine controller.
While CAM to CNC has been the focus of STEP-NC, this is only part of the picture as for most manufactured components, there are several machining and non-machining operations.
Process Planning needs to consider the most appropriate manufacturing methods, only some of the operations involve CAM and CNC yet all operations are dependant upon the data input. From this point, there must be more than one configuration
of a component the AP238 file fore a component.
To give a typical/simple example 'do not counterbore threaded holes' during the main machining operation as that task will be carried out after painting to ensure electrical connectivity of the final assembly. This illustrates that Process Planning information is required for the CAM activity (and on to CNC) and that manufacturing decisions and Process Planning are wider (or different) than the current scope of STEP-NC.
For swift International consensus, perhaps the best way forward is to agree a common understanding of the requirements rather than (at this stage) become concerned about the merit of extending the current AP238 versus a new/revised AP needed to represent them.
Best regards to you all Alan Crawford
LSC Group Ltd, Concept House, Victoria Road, Tamworth, Staffordshire, B79 7HL, United Kingdom
email: alc at lsc.co.uk
Tel: + 44 (0) 182 770 8582
Fax: + 44 (0) 709 236 3698
mobile: + 44 (0) 797 456 4773
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----------------- Original message follows -----------------
Date: 10/01/2002 - 8:27 p.m. (UTC)
From: Martin Hardwick <hardwick at steptools.com>
To: <slovensky at scra.org>, "Alan Crawford" <ALC at lsc.co.uk>, "'chiaki sakamoto'" <chiaki_sakamoto at keg.komatsu.co.jp>, "Friedrich Glantschnig" <fglantschnig at swissonline.ch>
CC: "Alan Crawford" <ALC at lsc.co.uk>, "David Loffredo" <loffredo at steptools.com>, "Frederick Proctor" <frederick.proctor at nist.gov>, "Suk-Hwan SUH" <shs at postech.ac.kr>, "Jochen Wolf" <j.wolf at wzl.rwth-aachen.de>, "Peter Mueller" <peter.mueller at erlf.siemens.de>, "Yong Tak Hyun" <hyt at wzl.rwth-aachen.de>, "Stefan Heusinger" <stefan.heusinger at isw.uni-stuttgart.de>, <kisinami at coin.eng.hokudai.ac.jp>, <step-manufacturing at steptools.com>
Subject: RE: Your E-mail and Presentation "Machining features and Machinin g Process Features"
Len,
What new units of functionality are needed to cover Macro
planning? Can they be added to AP-224 or AP-238?
Do you have names for COTS Macro and Micro planning systems
that will use the new AP?
I do not want to be hostile but linking data together that supposedly
could not be linked before is the "bull" that was used to justify AP-232
and ended the unity on how to implement STEP in PDM.
Martin
At 11:02 AM 1/10/2002 -0500, Len wrote:
>We at RAMP think there is a 3rd. It covers the exchange between the Macro
>process planning systems and the Micro process planning systems. We also
>see it as the data repository for process plans, as well as the product data
>that links together the As designed data (AP224) and the AS manufactured
>data (AP238) and the AS inspected data (AP219).
>
>Len
>
>-----Original Message-----
>From: Martin Hardwick [mailto:hardwick at steptools.com]
>Sent: Thursday, January 10, 2002 10:29 AM
>To: Alan Crawford; 'chiaki sakamoto'; Friedrich Glantschnig
>Cc: Alan Crawford; David Loffredo; Frederick Proctor; Len
>Slovensky(AP224); Suk-Hwan SUH; Jochen Wolf; Peter Mueller; Yong Tak
>Hyun; Stefan Heusinger; kisinami at coin.eng.hokudai.ac.jp;
>step-manufacturing at steptools.com
>Subject: RE: Your E-mail and Presentation "Machining features and
>Machinin g Process Features"
>
>
>
>Dear All,
>
>My own opinion is that AP-224 is the input to process planning and
>AP-238 is the output.
>
>If AP-238 is NOT the output of Process Planning then what is, and
>what is the name and functionality of the system that reads in the
>new output and writes out AP-238?
>
>Potentially there are lots of applications that want to use the output of
>process planning but do these applications have information requirements
>that are not satisfied by AP-238 or could not be satisfied by making a
>minor enhancement to AP-238?
>
>In PDM STEP did itself a lot of harm by continually inventing new
>Application
>Protocols for trivial reasons- first AP-203 then AP-232 then AP-214 then
>PDM Schema then PDM Modules and now PLCS. As an expert it is very unclear
>to me why this was necessary. I really hope we can avoid making the same
>mistake in manufacturing. Manufacturing is divided into CAD, CAM
>and CNC systems how many AP's do we need? My answer is 2.
>
>Martin Hardwick
>
>
>
>At 02:48 PM 1/10/2002 +0000, Alan Crawford wrote:
>
>>Dear Chiaki Sakamoto
>>
>>Thank you for distributing your set of slides on the machining process
>feature. The diagrams, in particular Fig. 1 will be a significant help in
>identifying the migration of design data in a form ready for machining
>processes.
>>
>>For AP224 the features are design representations prepared in a way useful
>for manufacture but that the features are independent of the method or
>processes used to manufacture. In AP238, the features in a part file need
>to represent a component in the complete form for that operation, on that
>workcentre. An updated approach is required for process planning in STEP,
>to establish the machining sequence. Evidently one new task for process
>planning is to prepare the feature information in a form required for each
>workstation, it will also be important to exclude some features not required
>until later in the manufacturing sequence.
>>
>>As the scope of STEPNC is extended to consider that more than one machine
>for the manufacture of a component [the general case], the requirement for
>in-process features to describe part-machined features is evident.
>>
>>Best regards
>>
>>Alan Crawford
>>
>>LSC Group Ltd, Concept House, Victoria Road, Tamworth, Staffordshire, B79
>7HL, United Kingdom
>>
>>email: alc at lsc.co.uk
>>Tel: + 44 (0) 182 770 8582
>>Fax: + 44 (0) 709 236 3698
>>mobile: + 44 (0) 797 456 4773
>>
>>-----Original Message-----
>>From: chiaki sakamoto
>[<mailto:chiaki_sakamoto at keg.komatsu.co.jp>mailto:chiaki_sakamoto at keg.komats
>u.co.jp]
>>Sent: 07 January 2002 08:37
>>To: Friedrich Glantschnig
>>Cc: Alan Crawford; David Loffredo; Frederick Proctor; Len Slovensky(AP224);
>Suk-Hwan SUH; Jochen Wolf; Peter Mueller; Yong Tak Hyun; Martin Hardwick;
>Stefan Heusinger; kisinami at coin.eng.hokudai.ac.jp
>>
>>Subject: Re: Your E-mail and Presentation "Machining features and Machining
>Process Features"
>>
>>
>>
>>
>>Dear Mr.Glantschnig,
>>
>> Thank you for your comments on my proposal.
>>
>> My explanation was not enough.
>>So I added Fig.2 and its explanation in the attached file.
>>
>> I think we have common understanding about Process Data Model.
>>
>>Chiaki Sakamoto
>>Komatsu Engineering
>>
>>(See attached file: Machining Process Feature.ppt)
>>
>>
>>
>>
>>
>>"Friedrich Glantschnig" <fglantschnig at swissonline.ch> $BF|;~(J: 2002/01/03
>>20:07:39
>>
>>"Friedrich Glantschnig"
><fglantschnig at swissonline.ch>$B$5$s$KJV?.$7$F$/$@$5$$(J
>>
>>$B08 at h(J : $B:dK\(J $B at i=)(J
>>cc : "Alan Crawford" <ALC at lsc.co.uk>, "David Loffredo"
>> <loffredo at steptools.com>, "Frederick Proctor"
>> <frederick.proctor at nist.gov>, "Len Slovensky\(AP224\)"
>> <slovensky at scra.org>, "Suk-Hwan SUH" <shs at postech.ac.kr>, "Jochen
>> Wolf" <j.wolf at wzl.rwth-aachen.de>, "Peter Mueller"
>> <peter.mueller at erlf.siemens.de>, "Yong Tak Hyun"
>> <hyt at wzl.rwth-aachen.de>, "Martin Hardwick" <hardwick at steptools.com>,
>> "Stefan Heusinger" <stefan.heusinger at isw.uni-stuttgart.de>
>>$B7oL>(J : Your E-mail and Presentation "Machining features and
>Machining
>> Process Features"
>>
>> << File: ATT29790.txt >> << File: Internet HTML >> << File: Machining
>Process Feature.ppt >>
>>
>>
>>*************************************************
>>COMPANY NOTICE
>>This e-mail, including any attached files, may contain confidential and
>>privileged information for the sole use of the intended recipient(s). If
>you
>>are not the intended recipient (or authorised to receive information for
>the recipient), please contact the sender by reply e-mail and delete all
>copies
>>of this message. If this e-mail contains attachments, you should ensure
>they are checked for viruses before opening them.
>>*************************************************
>>This e-mail originates from LSC GROUP LIMITED. Registered in
>>England & Wales No 2275471
>>Registered Office: Devonport Royal Dockyard, Devonport, Plymouth, PL1 4SG
>>*************************************************
>
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COMPANY NOTICE
This e-mail, including any attached files, may contain confidential and
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are not the intended recipient (or authorised to receive information for the recipient), please contact the sender by reply e-mail and delete all copies
of this message. If this e-mail contains attachments, you should ensure they are checked for viruses before opening them.
*************************************************
This e-mail originates from LSC GROUP LIMITED. Registered in
England & Wales No 2275471
Registered Office: Devonport Royal Dockyard, Devonport, Plymouth, PL1 4SG
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