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authors Kuan, L.P. and Hinds, John K.
year 1975
title A New Breed of Geometry for Numerical Control-Surfaces Through General Curves
source pp. 133- 169 : ill. (pp.144-169)
summary Recent geometric developments in the CAM-I Sculptured Surface project show promising applications to the perplexing problems of describing blends and fillets for conventional geometric parts, as well as providing greatly increased capability in the expression of pure sculptured shapes. The new geometry -- named 'Surfaces Through General Curves' -- is integrated into both the APT processor and the CASPA preprocessor. The CASPA (acronym for Computer-Aided Sculptures Pre-APT) processor is discussed briefly. All graphics material for this presentation was prepared through the use of this preprocessor. The original purpose of this talk was to discuss a preprocessor to the APT system. This preprocessor -- CASPA -- was first released in July of 1975 and contains the majority of sculptured geometry combined with a graphics processor. The preprocessor has been a great success as a development tool and has also been used by a number of sponsors in design and manufacturing applications. The system has been so successful that the main theme of this talk had to be changed to cover the new geometric developments in Sculptured Surfaces which were made possible by having a development tool such as CASPA. So the first part of this talk will sketch an outline of CASPA and the second part will describe the concepts and applications for some of these new geometric developments. Briefly, the CASPA system was developed in response to a single critical requirement: the need to have a system, simpler and more flexible then the full APT system, for implementing and testing new developments in Sculptured Geometry. The CASPA system today contains all of the Sculptured Geometric capability together with an integrated and extensive 3-dimensional graphics capability. It is a single-pass processor with a very simple, fixed-format input and interfaces with APT by punching APT- readable canonical forms. it is also capable of generating APT readable 'GOTO' cards to accomplish numerical control pattern machining of geometric models
keywords curves, curved surfaces, representation, computational geometry, CAM, mechanical engineering
series CADline
references Content-type: text/plain
last changed 2003/06/02 11:58
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