|
|
Minimizing errors in the alignment of the CAD model to the Coordinate Measuring Machine (CMM)
Miko, Jan ; Marek, Tomáš (referee) ; Šrámek, Jan (advisor)
This bachelor thesis is focused on the issue of alignment of measured data to nominal data in the field of metrology - measurement and evaluation of longitudinal dimensions, angles and tolerances of position and shape. The beginning of the work deals with the division of individual types of coordinate measuring machines and various data scanning technologies. The next section describes the measurement process, and especially in what ways the mea-surement can be performed. In the analysis of the use of methods for the alignment of nomi-nal data on a CAD model when measuring on a CMM, the individual methods of alignment are classified and described. The most common defects caused by alignment to a CAD mo-del are covered in the entire chapter, which describes what causes individual defects in most cases. The main part of the bachelor thesis is the study of measurements. In this study, the evaluation of outputs that were obtained after measuring and balancing the measured data on the CAD model of the reference part is processed. The alignment is performed by four diffe-rent methods. Subsequently, the individual methods were compared and the errors that occurred during the alignment were analyzed. In the last part of the work, a statistical evalu-ation of the measurement and determination of the measurement uncertainty is performed on the basis of the measured deviations of the positions of the assessed geometric elements, which occurred on the reference part. At the end of the thesis, the individual outputs that were obtained during the elaboration of the individual goals of the bachelor's thesis and the recommended methods of alignment for a specific application are evaluated.
|
|
|
Influences manufacturing technologies geometric and dimensional accuracy of workpieces
Suchomel, Kamil ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
The aim of the diploma thesis is to describe influences of selected production technologies on geometrical and dimensional accuracy of workpieces. Specific technologies - turning, milling and grinding and the machines on which these technologies will be implemented - a vertical lathe, a portal milling machine and a center grinder are described in this thesis. Additionally a procedure is created for adding geometric errors to a tri-axial machine tool to describe the entire working area of the machine in terms of errors. Subsequently an analysis of each geometric error is created for each machine and their influence on the resulting workpiece is determined.
|
|
|
Measurement of workpieces on machine tools using a touch probe
Velič, Samuel ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
This diploma thesis deals with the influence of electronic compensation on accuracy of the measurement using the touch probe. The theoretical part concerns touch probes, specifically their classification, principles of working and applications. This part also includes devices used later in the experiment, particularly double ballbar, laser interferometer and LaserTRACER. The Practical part describes an experiment, demonstrating the correlation between the accuracy improvement of the touch probe and the electronic compensation’s level. All measurements were executed in accordance with the norm VDA 5 and were evaluated by the Matlab software. The graphs of reliance tolerance of capability of measurement on the length of the benchmark. At the end of this diploma thesis there are partial conclusions deduced. The deduction is based on generated graphs. The partial conclusions synoptically compare the influence of individual machine´s configurations on the accuracy of the touch probe.
|
|
|
Design of a small CNC extension
Umlauf, Petr ; Marek, Tomáš (referee) ; Pavlík, Jan (advisor)
The aim of this bachelor’s thesis it to design a fourth axis for a small CNC milling machine and a search in the field of control systems. The thesis is divided in to three parts. The first part is a search, with focuses on types of structures and their important parts. The second part describes two different designs. For the chosen one was made part of drawing documentation, a 3D model in Autodesk Inventor Professional. In the thesis were with calculations checked important parts of the design. The third part focuses on control systems that are suitable for milling machine. Mach 3, LinuxCNX and Grbl-Mega-5X were introduced.
|
|
|
Design of small modeling CNC milling machine with movable table
Havlíček, Ondřej ; Marek, Tomáš (referee) ; Pavlík, Jan (advisor)
This master thesis deals with the constructional design of small CNC milling machine with a sliding table. The first part of the work describes small CNC milling machines currently available on the market. Based on the result of the literature review, the small CNC milling machine was constructed with respect to the currently available trends, including sizing and drawing documentation of the machine.
|
|
|
Bar transverse handling and transfering devices
Horký, Pavel ; Marek, Tomáš (referee) ; Knoflíček, Radek (advisor)
This bachelors thesis deals with the design of bar transverse handling and transferring device. In this thesis are described firstly fundamental principles of currently used mechanisms and secondly the components used to design mechanisms. In the last part is described the calculation of the main shaft, bearings and the engine. Attached are drawings of the designed device.
|
|
|
Measurement and evaluation of the inserts using an optical scanner
Vanek, Richard ; Šrámek, Jan (referee) ; Marek, Tomáš (advisor)
This bachelor thesis focuses on problematics of scanning damaged press dies by an optical 3D scanner. The bachelor thesis starts with a description of 3D scanning, its use in various branches of industry as well as defects that can occur during scanning. This work provides an overview of the methods of 3D scanning and 3D scanners. Another part of the bachelor thesis deals with the procedure of scanning a damaged press die using the optical scanner STEINBICHLER COMET LED 5M followed by processing the acquired data and creating a 3D CAD model. In the final part, the bachelor thesis focuses on comparing and evaluating the obtained data.
|
|
|
Data processing from measuring machine tools
Jelínek, Adam ; Marek, Tomáš (referee) ; Holub, Michal (advisor)
The aim of this bachelor thesis is to propose a procedure of an implementation of periodic control of geometric accuracy of machine tools into the maintenance process in Walter s.r.o. company. To carry out an initial series of measurements, evaluate collected data and to advice further actions based on the evaluation. Presented thesis also introduces some quality management tools, which may be used for the implementation of the process.
|
|
|
Design of spindle for lathe
Sovadina, František ; Marek, Tomáš (referee) ; Pavlík, Jan (advisor)
The thesis deals with the design and construction of headstocks of a turning centre. The aim is to design a spindle with an output of 20 kW and a maximum speed of 5000 1/min. The research part of the thesis is focused on the description of the basic parameters of the headstock and turning centres needed for the construction of the headstock and contains an analysis of the available spindles on the market. The next part of the thesis deals with the selection and calculation of cutting conditions and the necessary parameters. Analytical calculations are then verified using FEM analysis. At the end of the thesis, a 3D model was developed and headstock drawing documentation.
|
|
|
Design of bench type drilling machine
Malásek, Petr ; Marek, Tomáš (referee) ; Blecha, Petr (advisor)
The subject of this thesis is description of bench drill, research about companies producing bench drills and analysis of their products. Based on research, parameters of drill are chosen, 3D model is designed and basic calculations are calculated. The output of this thesis is 3D model of bench drill and drawing of assembly.
|
guest ::
