Munitions Manufacturing A Call for Modernization (2002) / Chapter Skim
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Appendix B: Machine Controllers
Appendix B: Machine Controllers
Pages 150-157
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From page 150... ...
Whether or not the hardware and software architecture is "open," these functions are basic to all machine tool controllers. The rationale for open architecture control follows, based primarily on information taken from the Open Modular Architecture Controller (OMAC)
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From page 151... ...
In parallel with the development of CNC ancl CAM, the mechanical design world began to make the conversion from manual design on cirafting boarcis to design using computer hardware and software tools. As these CAD systems evolved and grew in capability, they were an obvious candidate to link with CAM and CNC for an automated solution to the challenge of converting design into finished components.
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From page 152... ...
Programmable Logic Control PLC software, with extensions for CNC motion control, is developed by the machine tool builder (MTB) , using tools provided by the control manufacturer or an outside source.
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From page 153... ...
For example, whether or not a commandecl block has been completed before something else happens is often important and can be monitorecl. The Rationale for Open Architecture Controls Since CNC controllers are expected to perform a number of critical operations in real time, and because allowing users to modify the software opens control manufacturers to reliability and liability issues, the control manufacturers have historically been extremely reluctant to allow users to modify the executive functions of the control.
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From page 154... ...
PREVIOUS PROGRAMS RELATED TO OPEN ARCHITECTURE CONTROLS Nearly all of the federal government technology development programs on "OMAC-like" controls trace their origin to a gathering hosted by the Air Force Manufacturing Technology (ManTech) Directorate called the DoD Machine Tool Manufacturing Technology Development Conference, he~cl in Dayton, Ohio, in June 1987.
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From page 155... ...
The I MW program was the earliest attempt to create a "part from art," using an automatecl, unmanned machining workstation that could rapicily create a good first part from a feature-based electronic part clescription. The project results, which included the development of machining sensors, flexible fixtures, robotic loading devices, and expert systems for process planning, were not truly integrated into the "closecl" architecture CNC machine tools.
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From page 156... ...
MIST has installed a machine tool controller based on these interfaces on a 4-axis horizontal machining center at GMPTG. The intent of this demonstration system is to validate that the interfaces are comprehensive enough to serve a demanding application and to demonstrate several key concepts of open architecture controllers: component interoperability, controller scalability, and function extension.
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From page 157... ...
The next task was to add volumetric error compensation, in an OAC environment, to a Tbase lathe at LLNL. COMMERCIAL APPLICATIONS FOR OPEN ARCHITECTURE CONTROLLERS GMPTG made the first claim in the literature to installation of a microcomputer-based open architecture CNC controller in an industrial setting with a VM E-based system installed on a Kearney and Trecker four-axis milling machine in 1991.
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