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Planetary, cycloidal, worm, screw, harmonic gearboxes
Čišecký, Damián ; Pokorný, Přemysl (referee) ; Malášek, Jiří (advisor)
This bachelor's thesis focuses on planetary, cycloidal, harmonic, screw and worm gearboxes, providing an insight into the design, calculations and applications of these mechanisms in the transmission of mechanical energy. It contains clear schematic drawings, construction documents and calculations of transmission ratios, with an emphasis on current manufacturers and technical parameters.
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Adaptive setting of ball screws in milling CNC machining centers
Sedlák, Václav ; Pavlík, Jan (referee) ; Marek, Jiří (advisor)
This bachelor thesis deals with the structural design of a mechanism that provides adaptive ball screw mounting for CNC milling machining centres. First, a research of the current state of the art is carried out, then three design variants are proposed based on a system analysis. Next, an optimal variant is selected and two solutions are proposed to cover the widest possible range of needs of CNC machining centers. After the technical calculations, 3D models and accompanying technical documentation were created.
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Design of a ball screw for space applications
Volf, Tadeáš ; Pouzar, Josef (referee) ; Košťál, David (advisor)
This work deals with the construction of a ball screw acting as part of the table feed mechanism within a vacuum tribometer of the "pin on plate" type. The working environment inside the tribometer simulates real conditions of the space environment such as vacuum and high temperature differences. Therefore, the construction of the ball screw must primarily respect the parameters of the operating environment and further dimensional compatibility with the tribometer assembly. The resulting construction of this mechanism will be based on critical research of existing solutions and procedures, conceptual designs of specific solutions, as well as calculations and selection of standardized construction parameters and parameters affecting the impacts of the operating environment. Based on these calculations, resulting contact pressures and deformations between rolling elements and their tracks caused by thermal expansion were determined. These calculations are primarily based on Hertz's theory of contact pressures. Subsequently, their verification against their permissible values was carried out. The output of this work is a satisfactory design solution of the ball screw and corresponding drawing documentation.
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Design methodology for the selection of basic components of linear machine tool axes
Král, Stanislav ; Dosedla, Michal (referee) ; Holub, Michal (advisor)
The aim of the thesis is based on specified parameters positioning units, which include stroke (1m, 2m, 4m), load (5kg, 50kg, 500kg), you place the position accuracy (0.04 mm) and dynamic (maximum attainable speed 1.5 m / s), proposals to build a ball screw, linear motor, a toothed belt and toothed comb. For selected variants of positioning units to design a 3D model of positioning units. The proposed variations to compare and define their advantages / disadvantages, techno-economic comparison, the limit values of individual designs, etc. The work includes a search drive in positioning units, design units with toothed belt, a toothed comb, ball screw linear actuator, a calculated message of individual proposals then 3D design options for the ball screw and linear motor including drawings and assembly drawings.
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Modular linear axis
Chlapečka, Tomáš ; Bilík, Martin (referee) ; Pavlík, Jan (advisor)
This thesis contains a structural design of linear axis with a stroke up to 800mm and a maximum load of 800N. The thesis also deals with a modular assembly system of the linear axis based on the structural design. Linear axes can be fitted with rolled, whirled and grinded ball screws with thread pitch 5, 10, 16mm and rolled trapezoidal screws on pitch 4 and 8mm. The stroke of the linear axes can be selected in the range from 200 up to 800 mm, with a maximum load of 800N in all linear dimensions. The feed of linear axis is provided by shaped rolling guide way and four trucks. The modular system offers two servo motors with direct and indirect measuring four stepper engines with indirect measuring. The thesis also includes strength and functional calculations of principal components, graphs of the possible load on linear axis in different positions , durability of the ball screws, maximum speed and feed rate of the chosen screws, data sheet, 3D model, drawings and assembly drawings of the nodes.
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Energetic model of linear axis with ball screw and servodrive
Sládek, Vojtěch ; Tůma, Jiří (referee) ; Huzlík, Rostislav (advisor)
The aim of the thesis was to study the Energy Models of Linear Axes with Ball Screws and Servo Drives, to analyze the individual parts of the axis with respect to losses, the methodology of calculating the losses on the electrical part and the mechanical part of the drive and creating a complex algorithm that calculates the energy consumed for the specified motion. The thesis is divided into a theoretical and practical part, where the theoretical part is divided into the treatise on the electrical part of the axis and its losses and the part that deals with the mechanical part and its losses. The calculation is divided into the basic verification algorithm and the calculation on the given example. Each calculation is calculated for both linear acceleration and S-curve acceleration. For both types of acceleration, the result of energy and its course over time is also the waveforms of position, velocity, acceleration, angular acceleration, moments, powers, power, speed and currents over time.
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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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Construction design hydraulic press brake
Stránský, Jaroslav ; Holub, Michal (referee) ; Pavlík, Jan (advisor)
This thesis is divided into several chapters. First two chapters after introduction are written as search type. In next part I devoted to detailed design of functional mechanisms of linearly moving parts of press brake. For the construction of stop mechanism I dealt with conversion types as ball screw, pinion with rack and timing belts. There is also quite thorough calculation part in ball screw and pinion with rack issue. I have also dealt with the necessary bending force and then designed hydraulic cylinders. Elaboration of machine frame with safety features is included.
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Ball screws for the feed system with long stroke
Nováček, Milan ; Novotný, Lubomír (referee) ; Marek, Jiří (advisor)
Master´s thesis is directed for long ball screws of nut. It is here wrote their principle, essential type, parameters and current status of single used components. For this thesis is created at program Microsoft Excel methodical calculating of required parameters ball screws of nut. Another they are investigated status of affect length shaft ball screws, as mode storage, type actuator and possible damping. In last part is solved the design of supports long shaft ball screws and is here proposed conceptual process used supports.
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