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Planetary gearbox for the feed drive of CNC machine tools
Vodvárka, Petr ; Marek, Tomáš (referee) ; Marek, Jiří (advisor)
This master thesis deals with design of planetary gearbox for driving the feeds of CNC machines. The base of the design is a new type of gear (gear ring) with internal and external teeth. The work also includes a systemic approach that corresponds to the proposed structural nodes of the planetary gearbox. Three variants of using a special type of gearing were designed. One of them was selected and developed into its final form. This variant consists of a central gear, 3 satellites, a sun gear with internal and external teeth, an output gear, gearbox housing, and other components. Necessary calculations were performed using the SMath Studio software and 3D models and drawings were created using Autodesk Inventor software.
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Discrete modeling of transaction propagation in Bitcoin
Marek, Tomáš ; Marek, Marcel (referee) ; Zavřel, Jan (advisor)
Technologie blockchain je stěžejním bodem fungování Bitcoinu. Cílem teoretické části této práce je popsat principy, na kterých je technologie blockchain založena a zároveň shromáždit informace o tom, jak jsou transakce šířeny v síti Bitcoin. Cílem praktické části je vytvořit model velmi zjednodušeného Bitcoin Core klienta, který umožňí vytvářet, posílat a přijímat transakce na základě propagačního algoritmu využívaného v síti Bitcoin. Model je následně spouštěn v simulačním prostředí a výsledky simulace jsou analyzovány s cílem určit zdrojový uzel transakce.
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Modular milling machining center with a horizontal spindle axis and the possibility of mobility
Přibyla, Dalibor ; Marek, Tomáš (referee) ; Marek, Jiří (advisor)
The thesis deals with the design of a medium-sized milling machining center that meets the requirements of modular construction and mobility. These features are essential concerning modern trends in the circular economy and sharing. The current implementation of mobile machines is mainly focused on devices of small sizes and low weights. The concept of a medium-sized machine that could be efficiently transported and operated in a single transport unit, without the need for installing the machine on a fixed base, would offer the possibility of high-performance machining directly in the area of need. The thesis gradually develops the design of such a device. A multicriteria analysis selects the suitable design of the machining center, specifically with a movable stand, and a standardized transport container is chosen as the optimal transport-operational packaging. Solutions for individual construction elements are also proposed. Most of them are selected from commonly available products. However, the machining center itself is specially designed to fit into the transport unit. The foundation consists of the custom design of the stand with the motion system. Modularity is implemented through several series of different construction units of the proposed device. The transport package is designed to meet the criteria of load capacity and rigidity with minimal deflection when loaded with the machining center, which is achieved through rainforcement. Finally, the entire assembly is evaluated in terms of technical and economic evaluation.
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Design of bench drill
Štěrba, Jakub ; Marek, Tomáš (referee) ; Pavlík, Jan (advisor)
The aim of the work is a bench drill structural design. The first part describes drilling machine categories, compares some of drill press machines available on the market and lists main flaws of most drilling machines on the market. In the second part the basic concept is selected and the actual design of the individual components of the drill is performed. The third part contains selected strength and kinematic calculations. In the last part, the final model of the machine is presented, and the current production progress is discussed.
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Design apparatus for measuring geometric accuracy of machine tools
Holcman, David ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
This bachelor’s work deals with modern methods of geometric accuracy measurement of machine tools, modal analysis and definition of demands on used agents during the measurement process. A part of this work is dedicated to description of numerical finite element method, which is the cornerstone of ascertaining the natural frequencies by a software program. In the closing part the appropriate adjustments of minimisation of influence on measurement are suggested.
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Design of small hobby CNC milling machine with fixed table
Hanzal, Jiří ; Marek, Tomáš (referee) ; Pavlík, Jan (advisor)
The topic of this work is the design of a small model CNC milling machine with a fixed table for machining wood, plastic, or light alloys (Al, Zn, etc.). It also includes a calculation report and drawing documentation of selected nodes. The beginning of this work consists of an introduction to the issue of milling machines, their distribution and subsequent market analysis. Subsequently, the input parameters are designed on the basis of market analysis and in the last part there is a calculation report, the design of the milling machine itself and a short economic evaluation.
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Prediction of Selected Parameters of Rotational Kinematics Pairs of Machine Tools
Marek, Tomáš ; Šooš, Ĺubomír (referee) ; Kolář, Petr (referee) ; Blecha, Petr (advisor)
The dissertation thesis is used as a methodology for prediction of selected parameters of rotational kinematic pairs of machine tools. The motivation for its writing has been continually increasing requirements for parameters (performance, accuracy, static and dynamic stiffness) of machine tools. The methodology takes into account the availability of suitable measuring devices and description of the design of rotary kinematic pairs. It will be useable for predicting the behavior of rotational kinematic pairs, even at the design stage by applying results to the machine design. The work is processed so that first is used a system approach to suggest methodology for prediction of the behavior of rotary kinematic pair in CNC machine tools, planning measurement strategy and verifying the results, including applications for specific kinematic chain of the selected machine. Based on this system approach and the resulting methodology, the measurement of the rotary kinematic pair was performed. The results of the system approach and measurement are generalized in the form of recommendations for designers of machining centers, allowing to increase the accuracy of the rotational kinematic pair.
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Root cause analysis of scrap during production of bearing rings in a roller bearing company
Studýnka, Pavel ; Marek, Tomáš (referee) ; Marek, Jiří (advisor)
This diploma thesis concerns about measuring of rings of bearings from the input material, throughout machining processes, such as turning, heat treatment, grinding, till finishing operations as honing. Purpose of this thesis is to map all the processes in a roller/needle bearing company, measuring of rings of bearings, evaluating data, propose actions leading to decrease the number of scrap product and technical-economical evaluation of changed processes.
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Software support of teaching of cryptography protocols
Marek, Tomáš ; Lambertová, Petra (referee) ; Burda, Karel (advisor)
Document contains informations about authentication, encryption, data integrity and data authenticity. Next part includes description of well know cryptography protocols, their functions and also their weaknesses. All of these acquired informations were used in concept and final software support for teaching of cryptography protocols, which is able to run on clasic web-browser. Thats why the application was designed as web PHP pages using JavaScript and AJAX, which ensures plaform and OS architecture independency. Besides the descripted and ilustrated part of application there are also interactive parts and animations. The last period contains description of education software and its functions. Source code can be found on the appended CD.
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