An Integrated CAD/CAM System for Design and Manufacturing of High-Curvature Surfaces

1999 ◽  
Author(s):  
Liping Wang ◽  
Subramaniam S. Nair
Keyword(s):  
New York ◽  
Tool Path ◽  
Rear View Mirror ◽  
City College ◽  
Design And Manufacturing ◽  
Cad Cam ◽  
Filling Analysis ◽  
Five Axis ◽  
The City ◽  
Cam Software

Abstract This paper presents an integrated CAD/CAM system developed at the City College of the City University of New York (CCNY) for design, analysis and manufacturing of high-curvature surfaces. Surface modeling technique which is characterized by modeling from curvature or slope information, is discussed and practiced to design high-curvature surfaces such as rear-view mirror covers for automobiles. Plastic molding is chosen to manufacture the designed parts. Molding parameters such as entrance position and mold inserts are analyzed and determined using tools such as mold filling analysis (C-FLOW/EZ). Newly modified curvature matching method, together with methods provided by commercial CAM software, are adopted to generate five-axis NC tool path to manufacture the designed mold components. An example on design and manufacturing of a rear-view mirror cover using the integrated CAD/CAM system for high-curvature surfaces is given to illustrate the effectiveness of this system.

Research on Chamfer Software of Complex Parts

2013 ◽  
Vol 631-632 ◽  
pp. 1335-1341
Author(s):  
Shi Yong ◽  
Wen Tao Liu
Keyword(s):  
3D Model ◽  
Tool Path ◽  
Machining Parameters ◽  
Cad Cam ◽  
Programming Software ◽  
A Chain ◽  
Definition Of ◽  
Complex Parts ◽  
Cam Software ◽  
Location Point

In order to meet the needs of enterprises for chamfering complex parts, based on the customization of commercial CAD/CAM software, chamfer programming software is developed. According to user’s machining demands for a part, a chain of edges of a part is extracted from its 3D model. With preprocessing of the chain of edges, the continuity of the chain is estimated, and the start and end point of those edges are automatic obtained. Furthermore, with human-machine dialogue, machining parameters is set by users. By definition of the primary and secondary surfaces of the chain of edges, and interpolation of the edges, the positions of cutter location point and postures of cutter are calculated. Finally the interference of tool path is checked, and tool path is simulated. The software solves the programming problem of chamfering complex parts.

Tool Path Geometry for Multi-Axis Kinematics Conversion in CAD-CAM Integration

1992 ◽  
Author(s):  
Jui-Jen Chou ◽  
D. C. H. Yang
Keyword(s):  
Machine Tool ◽  
Tool Path ◽  
Cad Model ◽  
Geometrical Properties ◽  
Time Dependent Domain ◽  
Arbitrary Space ◽  
Cad Cam ◽  
Tool Motion ◽  
And Control ◽  
Five Axis

Abstract In the integration of CAD and CAM, it is necessary to relate machine tool kinematics and control in a CAM process to the geometrical data in a CAD model. The data stored in a CAD model is usually static in nature and represented by unitless parameters. Yet, in machine tool motion and control, the data should be transformed into a time dependent domain. In this paper, a general theory on the conversion from desired paths to motion trajectory is analytically derived. The geometrical properties of a desired path, including position, tangent, and curvature are related to the kinematics of coordinated motion including feedrate, acceleration, and jerk. As a result, the motion commands used as control references to track arbitrary space curves for five-axis computer-controlled machines can be generated in a rather straight-forward as well as systematic way.

scholarly journals Driving on the Left: Sorkin’s View of the Street, the City and architecture

2013 ◽  
Author(s):  
Michael Sorkin ◽  
Graham Cairns
Keyword(s):  
New York ◽  
Political Action ◽  
Graduate Program ◽  
Fine Arts ◽  
Contemporary Culture ◽  
Environmental Threats ◽  
City College ◽  
The Media ◽  
Village Voice ◽  
The City

Sardonic, cutting, insightful, provocative: Michael Sorkin is one of today’s most radical architectural commentators with a staunch leaning to the political left and a literary bent for framing painful truths in ironic, and sometimes hilarious, verse. However, he should not be dismissed as a radical, isolated, or lone and unhindered voice however. He is a Distinguished Professor of Architecture and Director of the Graduate Program in Urban Design at the City College of New York, and he has been Professor of Urbanism and Director of the Institute of Urbanism at the Academy of Fine Arts, Vienna. In addition, he has taught at architecture schools across the world, including the Architectural Association, Columbia, Yale, Harvard and Cornell. Sorkin runs his own design studio and research institute and has been a contributing editor of the Architectural Record . He was the architecture critic of the Village Voice for ten years and has published innumerable articles and essays. A list of some of his books includes: Twenty Minutes in Manhattan , Variations on a Theme Park , Exquisite Corpse , The Next Jerusalem , Indefensible Space , and a long list of other etcs . and alsos ….In this interview-article, he offers his opinion on a range of issues, including the environmental threats to contemporary America, architectural symbolism and paranoia, the importance of political action on the streets of the modern city, and the role of the architecture critic in the complex tapestry of contemporary culture. With regard the position of the modern critic, he begins by responding to a question regarding the relevance of Noam Chomsky’s description of the media as a form of propaganda and the contemporary journalist as functioning through the structure of what Chomsky defines as “filters,” or constraints and biases that dictate what gets written and published in the press.

Integrated Projects and the Development of Interdisciplinary Problem-Solving Strategies

2013 ◽  
pp. 206-236
Author(s):  
Paul C. King
Keyword(s):  
New York ◽  
New York City ◽  
Problem Solving ◽  
York City ◽  
Department Of Education ◽  
City College ◽  
Core Skills ◽  
College Of Technology ◽  
Interdisciplinary Problem Solving ◽  
The City

Interdisciplinary problem solving and research skills require early preparation in two categories: critical thinking and communication. This chapter reviews the two-year process of interdisciplinary curriculum development, shaped by collaboration between the New York City Department of Education, the New York City College of Technology of the City University of New York, and City Polytechnic High School of Engineering, Architecture, and Technology. The resulting course, “Inter-Academy Integrated Projects” (IP), emphasizes multidisciplinary problem solving that includes creativity, observation, research, visual and discursive communication, and reflection. The collaborative lessons make use of project-based methodology and emphasize social responsibility. Core skills are combined across the two trimesters of IP. This endeavor will be contrasted and compared to the work of the Partnership for the 21st Century Skills by examining the use of high-impact learning practices, feedback from students and teachers, and the issues surrounding the implementation of any new curriculum.

Micro-EDM Milling of Micro Compressor Prototype

2007 ◽  
Author(s):  
Zhenlong Wang ◽  
Yinghuai Dong
Keyword(s):  
Tool Path ◽  
Electrode Wear ◽  
Micro Edm ◽  
Simple Tool ◽  
Micro Power ◽  
Fast Development ◽  
Cad Cam ◽  
Rotor Disk ◽  
Micro Turbine ◽  
Cam Software

Micro power system is becoming more and more important for micro- and nano-scale system. The fast development of MEMS (Micro Electromechanical Systems) has strongly enhanced the application of new harder work materials. The fabrication of metallic 3D microstructures has been one of the most attractive topics of micro machining. Currently the basic materials of Micro-turbine Engineering were nonmetal materials such as SiC, most of them are 2D or quasi-3D structures. This paper focuses on the manufacturing process on micro compressor prototype by micro-EDM milling. The micro compressor prototype contains the rotor disk and stator disk. A simple tool path generation by CAD/CAM software and a general electrode wear compensation strategy is presented. The micro compressor prototype with rotor and stator disks was successfully fabricated by using this strategy, and the materials of workpieces are nickel alloy GH4169 and titanium alloy TC4.

The Development of an APT Program Interpreter for 5-Axis Machining

2012 ◽  
Vol 482-484 ◽  
pp. 2247-2252 ◽  
Author(s):  
Hsin Yu Cheng ◽  
Jo Peng Tsai ◽  
Yung Chou Kao
Keyword(s):  
Research Result ◽  
Value Added ◽  
Working Process ◽  
Nc Code ◽  
Cad Cam ◽  
Cutter Orientation ◽  
Advanced Machining ◽  
Five Axis ◽  
Cam Software

As there are various machine configuration and frequent changes of cutter orientation in 5-axis machining, the standard NC codes are not inter-exchangeable among machines. This phenomenon induces a lot of cutting difficulties and machining problems such as the inconvenient working process for operators and very low cutting efficiency. At present, some advanced machine controllers already can accept the APT code besides NC code to increase the cutting flexibility. They also offer some advanced machining functions such as tool center point control and spatial compensations of tool, etc. By way of APT interpreting, the common controller can also implement these advanced functions. Besides, CAD/CAM software also supports APT post-processor to generate NC code for different machine configurations. This means the application of ATP program has played an important role in five-axis machining. However, although CAD/CAM software supports the interpretation of APT program as a core key technology of five-axis machining, the manufacturers of controller with advanced functions are unwilling to open their system. Up to now, there has been few related research papers published on this topic. In this paper, we proposed an APT interpretation method for five-axis machining. This method includes seven functional modules and related implementing procedures. A case study has been adopted to demonstrate the feasibility of the proposed method. The research result could be adopted as a reference to develop the value-added technology in 5-axis machine tool application for academy and industry.

scholarly journals Testing CREATE at Community Colleges: An Examination of Faculty Perspectives and Diverse Student Gains

2016 ◽  
Vol 15 (1) ◽  
pp. ar8 ◽  
Author(s):  
Kristy L. Kenyon ◽  
Morgan E. Onorato ◽  
Alan J. Gottesman ◽  
Jamila Hoque ◽  
Sally G. Hoskins
Keyword(s):  
Community College ◽  
New York ◽  
Community Colleges ◽  
Epistemological Beliefs ◽  
The United States ◽  
City College ◽  
Diverse Student ◽  
Thinking Ability ◽  
And Mathematics ◽  
The City

CREATE (Consider, Read, Elucidate the hypotheses, Analyze and interpret the data, and Think of the next Experiment) is an innovative pedagogy for teaching science through the intensive analysis of scientific literature. Initiated at the City College of New York, a minority-serving institution, and regionally expanded in the New York/New Jersey/Pennsylvania area, this methodology has had multiple positive impacts on faculty and students in science, technology, engineering, and mathematics courses. To determine whether the CREATE strategy is effective at the community college (2-yr) level, we prepared 2-yr faculty to use CREATE methodologies and investigated CREATE implementation at community colleges in seven regions of the United States. We used outside evaluation combined with pre/postcourse assessments of students to test related hypotheses: 1) workshop-trained 2-yr faculty teach effectively with the CREATE strategy in their first attempt, and 2) 2-yr students in CREATE courses make cognitive and affective gains during their CREATE quarter or semester. Community college students demonstrated positive shifts in experimental design and critical-thinking ability concurrent with gains in attitudes/self-rated learning and maturation of epistemological beliefs about science.

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