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 40 for “"Depth of cut"”.
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Variable depth of cut machining for dynamic error compensation
Variable depth of cut machining (VDCM) refers to machining systems that have the ability to vary the depth of cut rapidly by utilizing fast-tool servos. In recent years, researchers have investigated the development of VDCM for several industrial applications. These include both the turning of …
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Identification of Depth -of -Cut Variations and Their Effects on the Process Monitoring for the End Milling Process
In situations where significant cutter deflection is present, a fully-flexible mechanistic end milling force model is proposed to generate simulated force profiles for the DOC variation estimation. The end mill cutter is discretized as a series of elliptical disc elements. Effective cutter …
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Overhung-boring bars: The performance of undamped and damped bars under static and dynamic conditions when machining metals
The work of the author was to investigate the static, dynamic and machining behaviour of some new designs of slug damped boring bars with a 10 to 1 overhang ratio. The bars were mounted on a centre lathe. The static behaviour of a boring bar in relation to the geometric form errors that might be …
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Experimentally validated 3D MD model for AFM-based tip-based nanomanufacturing
… there is a need to conduct a more focused study of the effects of different parameters, such as feed, speed, and depth of cut on the process performance and outcome. This is achieved by experimentally validating a MD simulation model of nanomachining, and using it to conduct parametric studies to …
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Performance of laser assisted micro-milling (laμmill) of titanium alloy using micro ball end mill
… less has been reported on the application of ball end mill in laser assisted micro milling. This study was carried out to evaluate and clarify the machining characteristics of micro ball end mill in laser assisted micro milling of titanium alloy Ti6Al4V. Finite element method (FEM) …
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Compliant Meso-Scale Grinding of Silicon
… apparatus, a normal grinding force model and a depth of cut model were developed to account for the large compliance in the grinding system. Numerical simulation was performed to predict actual depths of cut and the results were within 6% of the measured/actual depths.
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Development of a Cost Oriented Grinding Strategy and Prediction of Post Grind Roughness using Improved Grinder Models
Irregularities in pavement profiles that exceed standard thresholds are usually rectified using a Diamond Grinding Process. Diamond Grinding is a method of Concrete Pavement Rehabilitation that involves the use of grinding wheels mounted on a machine that scraps off the top surface of the pavement …
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A rapid, non-destructive test to detect camshaft lobe grinding burn
… study, initially under the sole sponsorship of Ford Motor Company, and subsequently under the auspices of the National Science Foundation, with industrial participation from American Stress Technologies, Ford Motor Company, G.E. Superabrasives and Litton Automotive Services. Six mechanically …
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A comparison of the performance of Namibia-specific conservation and conventional tillage technologies as used for pearl millet production in northern Namibia
Studies were conducted over a period of three years (2011 to 2013) at the Ogongo Campus of the University of Namibia (UNAM), to compare the differences between tractors and animal-drawn implements both using conventional and Namibia Specific Conservation Tillage (NSCT) technologies. Two …
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Design of an Original Methodology for the Efficient and Economic Appraisal of Existing and New Technologies in Form Grinding Processes including Helical
The purpose of this research was to create and design a methodology for new product evaluation with an interest in the affects that they could have on form and helical grinding. The design uses a relatively small and commonly available grinding machine so that testing could be done without need for …
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A Mechanistic Force Model and Stability Analysis for Contour Turning
… along the toolpath are analyzed in terms of the overlap factor (amount of regeneration) and the cutting stiffness variations. A mechanistic model based force-feedback scheme for disturbance rejection and tracking control in radial contour turning is proposed. The stability issues for the …
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Effect of rate of sumping on fragmentation process in laboratory rotary cutting simulator
… kept minimum to produce the optimum parameters of the rock/coal breakage process and to attain maximum sumping. There are three major elements affecting the efficiency of the cutting head namely: (1) Geometry and size of the cutting tool, (2) Geometry of the drum and lacing and arrangements of …
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Design and fabrication of a pencil shoulder cutting device for a novel endcap
The pencil shoulder cutting device is a stepper motor driven mechanism to cut a small groove into the end of a pencil, which is needed for a novel seed-capsule endcap for a new pencil called Sprout. The pencil was developed by a team of MIT graduate students, and the shoulder cutting device is one …
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Cycle Time Reduction for CNC Machining Workcells in High-Mix Low-Volume Manufacturing
… to enhance the workcell's capacity. Key areas of investigation include machining speeds and feeds, depth of cut, machine settings, toolpath strategies, stepover percentages, and alternative tooling. The study specifically targeted the initial roughing operation, which uses a feed mill and is …
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Development of A closed Loop Control System for Vibration Assisted Grinding
Increasing demand for components made of hard and brittle materials such as glasses, steel alloys and advanced ceramics is such that conventional grinding and polishing techniques can no longer meet the requirements of today’s precision manufacturing community. However, it is essential and much …
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Empirical model-based control for end milling process
The main objective of this research is to develop an empirical model-based control mechanism to maintain a fine surface finish quality by maintaining on-line cutting force values. The proposed model has been developed to present the control model constraints, by varying the machining parameters to …
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Approaches for chatter reduction in deep cavity and intricate surface milling
The goal of the project was to increase the metal removal rate or improve the surface quality of an intricate surface cut by a long overhang tool. The results of the metal cutting tests show that the surface quality of a finish cut at conventional milling speeds can be improved by approximately 50% …
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Development of a high-speed high-precision micro-groove cutting process
… high-precision chip formation-based micro-groove cutting process has been developed for cutting grooves in metals with nearly arbitrarily shaped cross-sections, which have widths and depths of a few hundred nanometers to a few microns, and lengths of tens of millimeters. A flexible tool, …
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Design of an automated on-car brake lathe
… by rotating them "in place" and making a light cut along the surface of the disk. The primary goal of this thesis is to develop an automated cutting head for an on-car brake lathe. The new cutting head must produce a surface finish that matches or exceeds that of the current (manual) cutting …
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Modelling and simulation of surface roughness obtain from micro milling by using artificial neural network
Surface roughness is one of the most important properties in any machining process and in micro milling it is really critical as the product needs to be of a very high surface quality. Therefore the present research is aimed at finding the optimal process parameters for end milling process and …
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