Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"five-axis"”.
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Five axis machining of stamping dies
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Virtual five-axis flank milling of jet engine impellers
… models and algorithms necessary to simulate the five-axis flank milling of jet-engine impellers in a virtual environment. The impellers are used in the compression stage of the engine and are costly, difficult to machine, and time-consuming to manufacture. To improve the productivity of the flank …
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Automated Process Planning for Five-Axis Point Milling of Sculptured Surfaces
… an automated process planning system for 5-axis point milling of sculpture surfaces (finish cut) are presented. Based on existing research, workflow for process planning was carefully planned out, with optimization and improvements in the following areas: Firstly, a new representation scheme …
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Prediction of cutting forces in five-axis micro-ball end milling
Five axis micro-ball end milling has been shown as a viable option for machining complex free form surfaces with high aspect ratios and provide micron-scale tolerances. Unfortunately, due to the high fragility of the cutting tool, premature tool failure has been a major challenge in micro-scale …
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Development of a Five-Axis Machining Algorithm in Flat End Mill Roughing
… and more efficient than conventional three-axis machining [Jensen 1993, Simpson 1995 & Kitchen 1996]. Despite the successes of CM2 there are still many areas available for research. Consider the machining of a mold or die. The complex nature of a mold requires at least 20-30 weeks of lead …
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Design and fabrication of the MesoMill : a five-axis milling machine for meso-scaled parts
… and an air bearing spindle with an integral Z-axis.
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Design and development of high precision five-axis positioning system for roll-to-roll multi-layer microcontact printing
Microcontact printing is based on the use of elastomeric stamps to transfer ink onto a substrate taking advantage of the self-assembly process. Features as small as 300nm can be easily printed over an extended area. The accuracy and the speed of the process make it suitable for many industrial …
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Discrete modeling of sculptured surface machining for robust automatic feedrate selection
… selection techniques currently used in three and five-axis CNC machining reduces milling efficiency. Manually estimated feedrates tend to be conservative and constant, greatly increasing mill time. The goal of this research is to develop robust techniques and software tools for automatically …
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Automatic 5-axis NC toolpath generation
… generation has remained an elusive goal for 5-axis NC machining. This thesis describes the theoretical and practical issues associated with generating collision free five-axis roughing and finishing toolpaths automatically from the CAD model of the part. Instead of decomposing the shape into …
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Design and development of high precision elastomeric-stamp wrapping system for roll-to-roll multi-layer microcontact printing
… of a high-precision wrapping system, design of a five-axis positioning system, and modification of the impression roller. This thesis describes in detail the design of an innovative high-precision system to wrap the elastomeric stamp on the print roller. This is followed by results of multilayer …
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Minimum error tool path generation method and an interpolator design technique for ultra-precision multi-axis CNC machining
This thesis investigates an ultra-precision multi-axis CNC machining problem encountered in machining sculptured surfaces. Conventional multi-axis CNC machining uses straight line segments to connect consecutive data points, and uses linear interpolation technique to generate the command signals …
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The effect of probe tilt angle on the quality of scanning tunneling microscope measurements
… some support to the effort to develop a new, five-axis STM capable of tilting in a controlled manner while scanning. The objective of such a machine would be to allow its probe to trace the sample's contour with greater accuracy than the currently available three-axis STM can. It is postulated …
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Design of a formed - folded compliant layered mechanism
… the CLM sheet. The CLM is implemented in a five axis nano-manipulator capable of a range of hundreds of microns and a resolution of tens of nanometers. The CLM manipulator is modeled using a node/beam stiffness matrix in CoMeTTM. The performance of the manipulator and the accuracy of the …
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Global Finish Curvature Matched Machining
… various methods in tool path generation for SSM. Five-axis curvature matched machining (CM2) is the most efficient. With the widespread use of 5-axis mill in industries, CM2 is a better solution for improving the machining efficiency for product concept models. CM2 has very good performance for …
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Reconfiguration and tool path planning of hexapod machine tools
… Three dissimilarities between hexapods and five-axis machines are identified and studied to enhance the basic understanding of tool path planning for hexapods. The first significant difference is the existence of an extra degree of freedom ([gamma] angle). The second dissimilarity is that a …
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Supportless Fabrication, Experimental, and Numerical Analysis of the Physical Properties for a Thin-Walled Hemisphere
Although multi-axis bead deposition-based additive manufacturing processes have been investigated in many aspects in the literature, a general process planning approach to address collision detection and prevention still needs to be developed to fabricate complex thin-wall geometries in a …