June 24, 2017
June 24, 2017
June 28, 2017
NC machining has grown through several stages before it came to its present level. At the beginning with no Computer Aided Design to assist, the geometric nature of components was inputted through codes. This took the beneficial practices in programming such as loops. During this time a challenging and lucrative job is code proofing where the codes were checked and proved to be correct, manually. This demands a command in NC programming. This ability to detect any errors in the code is valuable even now. CAD in the meantime was developing faster and methods to define complex curves and surfaces, for example the Bezier curve and surface, were developed. The next generation of CNC machines took advantage of these developments and provided for the inclusion of these at what can be called the low level CAM packages. They generated codes for few defined curves and surfaces. As CAD continued to develop and the power of computers became available at comparatively low cost the next generation of sophisticated CAM packages that can generate NC codes for complex curves and surfaces started to appear at a very rapid rate. MasterCAM is a typical example of this kind of CAM package that can take a CAD model as the input to generate the code. As CAD continued to develop with feature based modelling, feature based CAM has been developed. Thus one can see four generations (i) code based CNC (ii) Low level CAM based CNC (iii) high level CAM based CNC and (iv) feature based CAM and CNC in the development path. Each has its strength and it was felt that students who are familiar with all four can easily gain command in their professional lives. At X university the students are exposed to the first generation work with bench-type MTAB turning machines that require code to be keyed in. They are then exposed to the second-generation low level CAM through the BOXFORD bench-type milling machines. Here they could use Bezier curves and other geometries as input. They are then moved to the advanced CAD based CAM package generation, with a CNCINNATI arrow 2 machine. This is a powerful industry type machine that can machine complex surfaces with the help of the MasterCAM package. After this they move to the DMG turning center that permits feature based inputs. By following this passage the students learn the strengths and difficulties of each generation. This paper will discuss examples from each of the four generations. Samples and a short presentation will be produced at the poster session.
Sivaloganathan, S., & Ganithi, R., & Airani, Y. K. (2017, June), Board # 148 : MAKER: Generations of NC Machining through Laboratory Work Paper presented at 2017 ASEE Annual Conference & Exposition, Columbus, Ohio. https://peer.asee.org/27768
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