The work deals with the technology of electrical discharge machining using a wire electrode. Described are machines, tools, wire electrode cutting parameters and advantages of this technology. The aim of the work is to quantify the cutting area with respect to dimensional accuracy, make an analysis of surface layer state and quality after wire cutting, and describe factors affecting this layer. In particular, emphasis is put on tool steel cutting.

The aim of this dissertation are future trends of electrical discharge machining in conditions of a small tool factory. In the introduction is presented the theory of non-conventional machining. The practical part is focused on valuation the current level of electrical discharge machining, the importance of the use in a tool Nástrojárna Ryšavý. It also compares the level of leading global manufacturers of electrical discharge machines and future trends of electro-discharge technology.

The thesis discusses an unconventional technology of wire-cut electro discharge machining. In the beginning there is a description of the basic principle, the fundamentals of electro discharge machining and its technological application. Further chapters characterise the wire-cut electro discharge machining, the wire electrodes used, the main parts of the machine, the cutting conditions and the advantages of this technology. The practical part is focused on the possibilities of the camera system during the production on a wire cutting machine and the comparison of nowaday´s machines in the manufacture of precise cutting tools in the middle-sized tool-room.

The diploma thesis is notionally divided into three parts. The first literature search part deals with the electronic discharge machining. The second main part solves the problem of machining plungers (movable part of the injection mold). This part also includes a technological process including production instruction cards. There are also calculated costs of production for this diploma part. The last part compares applications of electronic discharge machining technology with applications of milling technology.

In this thesis, a method to improve survivability is developed for fiber Bragg gratings under high velocity impact in dynamic body armor shape sensing applications by encasing the fiber in silicone. Utilizing the slipping of the fiber within the silicone channel, a proportionality relationship between the strain of the fiber to the acceleration of the impacting projectile is found and is used to obtain the rate of the back-face deformation. A hybrid model is developed to handle errors caused by the stick-slip of the fiber by fitting an inverse exponential to stuck sections found in a captured strain profile and double integrated to transform the stuck section to its equivalent slipping. Displacement errors below 10% was achieved using the hybrid model. A graphical user interface with a step-by-step walkthrough and a fiber Bragg grating interrogation system was designed for test engineers to utilize this technology. Test engineers from the Army Test Center in Aberdeen, MD were trained on this technology and successfully captured and processed shots using this technology. A method for cutting Silicon through wire-EDM machining is developed by utilizing the photoconductive properties of Silicon. Cut rates for unilluminated and illuminated Silicon was compared and a 3x faster cut was achieved on the illuminated cuts.

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<p>Electrical discharge machining (EDM) is a non-conventional machining process utilizing a series of electrical discharges to melt and vaporize workpiece material. In a wire EDM configuration wire breakage is a limiting factor in the machining productivity during the machining of workpieces with varying heights. Present methods of estimating workpiece height on-line in an effort to optimize machining parameters monitor the electrical signals for changes which may not be completely indicative of a change in workpiece height. This thesis intends to utilize acoustic emission (AE) sensors as a method for mapping the discharge location in order to estimate the workpiece height. This represents a novel approach as acoustic emission testing, while prevalent in the process monitoring of numerous conventional machining processes has yet to be significantly studied in combination with EDM.</p> <p>Another useful application of AE sensors with the EDM process under consideration is during the fast hole EDM process, where excessive wear is seen in the electrode causing true electrode length to remain uncertain. By using acoustic emission sensors to determine the true length of the electrode it could be possible to aid in the breakout detection of the electrode.</p> / Master of Applied Science (MASc)

This dissertation explores how the subcultural practice of liquid dance emerged from US rave culture and continues to sustain itself and evolve in today’s era of social media and EDM festival culture. I draw upon the concept of flow as a lens to trace the historical, aesthetic, digital, social and subcultural trajectory of liquid dance. I analyze how this subculture continues to evolve through individual practice, as well as how dance is shared through online and live dance exchange. My dissertation consists of seven chapters that provide both academic and practitioner perspectives of liquid dance. My research methods combine a multidisciplinary approach to implementing semi-structured interviews, participant observation, and digital archival research. My fieldwork consists of interviewing fourteen liquid practitioners, as well as conducting ethnographic research at an EDM festival where liquid dancers annually attend and participate. The purpose of this project is twofold. One, to contribute new knowledge to the field of dance studies on the specific dance genre of liquid, which up until now has not been documented in this field. Two, to provide a space for practitioners to openly share their perspectives in a collaborative effort to produce new knowledge. From the beginning, it has been my intention to produce a dissertation that provides the foundation for a continuing series of academic discussions from which to draw upon for further, future research and critical engagement with liquid dance. This document may also be used as a template for scholars across disciplines to deploy as a lens to analyze and critique other subcultural dance practices within the continuum of rave, club and dance music festivals. / Dance