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 20 of 25 for “"CNC machining"”.
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Cycle Time Reduction for CNC Machining Workcells in High-Mix Low-Volume Manufacturing
… the available manufacturing capacity, with the CNC milling workcell identified as the bottleneck operation. This research, conducted in an active, high-mix, low-volume production environment, focuses on evaluating and implementing improvements to CNC machining parameters to enhance the …
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Modeling, Parameter Estimation and Compensation of Quasistatic Errors in Multi-Axis CNC Machining Centers
Dimensional accuracy is often the single most critical criterion that can be used to evaluate the quality of machined parts. Increasing demand for highly accurate and inexpensive mechanical parts has created a critical need for developing economical and efficient processes for their production.
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Minimum error tool path generation method and an interpolator design technique for ultra-precision multi-axis CNC machining
… 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 for …
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Integrated process planning for a hybrid manufacturing system
"A hybrid manufacturing system integrated CNC machining and laser-aided layered deposition and achieves the benefits of both processes. In this dissertation, an integrated process planning framework which aims to automate the hybrid manufacturing process is investigated. Critical components of the …
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Design of a desktop milling machine for fabrication in an introductory machine shop class
… and test the electromechanical subsystem of a CNC milling machine kit. Unlike all other CNC kits on the market, the purpose of this kit is to teach students the principles of electro mechanics during its construction and to teach the principles of CNC machining during its operation. The design …
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Predictive analytics for smart manufacturing : use and impact from a systems thinking perspective
… in Computerized Numerically Controlled (CNC) machining processes by using a predictive model based on the cutting sound data. With advances in machine learning algorithms and predictive analytics techniques, it becomes possible to create a noise-robust predictive model from an …
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G-Code Based Toolpath Simulation for Predicting CNC Energy Consumption
Machining is an energy intensive process, and being able to model the energy consumption of machining would allow manufacturers to consider how to reduce their energy footprint. While many models have been developed for estimating energy consumption, they are not easily applicable or accessible to …
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Design of a small folding Table for a wheelchair
… is very small, the table will be manufactured by CNC machining and it will cost upwards of $100.
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Design and fabrication of meso-scale flexural testing apparatus for evaluating aligned CNT composite flexures
… The testing apparatus is fabricated using CNC machining, and assembled in a controlled environment to reduce thermal and mechanical error during operation. The system is calibrated and its resolution is found to be 0.021 N over a range of 28.5 N applied force and 1.5 pm over a range of 816 …
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Implementation of Machine Connectivity in Low-Volume High Variety Manufacturing Line
… control), allowing for line-by-line feeding of CNC code to machine controllers, as well as machine data collection for real-time shop floor monitoring. The research emphasizes the development and implementation of an advanced network infrastructure designed to improve efficiency, security, and …
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Breaking the Mold on Job Shops
… is explored through the lens of Company X, a CNC machining supplier serving the aerospace and defense industry. Execution to this strategy introduced a strong culture of continuous improvement and bias for action. Initial results include an improvement in on-time delivery performance at …
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Methods for increasing customization in rapid machining patient-specific bone implants
… a subtractive rapid manufacturing process called CNC-RP, which combines the automated process planning of rapid prototyping (RP) technologies with the capabilities of 4-axis CNC machining. New methods are proposed for providing more effective setup planning for the CNC-RP process, and for …
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Microscale controlled continuous cell culture
… water, acids, and bases. We introduce a direct CNC machining and chemical bonding fabrication process for production of fluidic devices with a 1 mL working volume, high oxygen transfer rate (kLa ~ 0.025 s-1), fast mixing (2 s), accurate flow control (± 18 nL), and closed loop control over …
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Discrete modeling of sculptured surface machining for robust automatic feedrate 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 generating …
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Investigation on quantitative assessment of energy consumption and the associated sustainability performance of CNC milling machines
… and the associated sustainability aspects of CNC machines and operations is the key driver for this research, albeit incorporating its implementation and application perspectives on shopfloor machining operations is the predominant goal as well. The research presented consists of two …
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Design and Mechanical Validation of Commercially Viable, Personalized Passive Prosthetic Feet
… process capabilities, we demonstrate why CNC machining of Nylon 6/6 is an appropriate process for satisfying these requirements. Although additive manufacturing is often seen as a compelling method for creating customized products, additively manufactured ESR prosthetic feet would likely …
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Computational Tools for 3D Printing and Woven Textile Design
… aims to make 3D weaving as readily usable as CNC machining or 3D printing, by providing an algorithm to convert an arbitrary 3D solid model into machine instructions to weave the corresponding shape. We propose a method to generate 3D weaving patterns for height fields by slicing the shape …
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Rapid contour determination using a floating pin matrix
… a few hours with the use of CAD software and CNC machining. This reduction in thought-to- part time begs the question of how the part-to-thought process can be sped up. Currently, if a designer needs to determine the geometry of a complex contour, he has to use either a phase-change material …
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HIGH-PERFORMANCE PERIODIC ANTENNAS WITH HIGH ASPECT RATIO VERTICAL FEATURES AND LARGE INTERCELL CAPACITANCES FOR MICROWAVE APPLICATIONS
… fabrication methods are considered, including CNC machining and deep X-ray lithography (DXRL). Hands-on experiments provide an outlook of possible future DXRL fabricated SE-EBG-RAs.
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Design and analysis of non-threaded drill pipe connector.
… printing methods (plastic prototypes) as well as CNC machining (metal prototypes) to manufacture Pin, Box and Snap-Latch Ring prototypes. The thesis concludes that, within the current limitations with respect to all three components (Pin connector, Box connector and Snap-Latch Ring), the stress …
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