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3D scanning of glossy surfaces
Zeman, Jakub ; Zatočilová, Aneta (referee) ; Koutecký, Tomáš (advisor)
The goal of this bachelor thesis is to experimentally determine the impact of different concentrations of titanium matte coating on the properties of matte film covering glossy surface intended for 3D scanning. Theoretical part of the thesis contains brief introduction to the 3D digitization of real objects as well as more detailed description of the particular scanning method used in this thesis and summary of possible digitizing errors and existing knowledge about matte coatings. The practical part composes of applying the titanium matte coating on specimens using automated coating device thus maintaining the exact same conditions for all concentrations. Following measurement of specimens using 3D scanner and optical profilometer results in determining the optimal concentration of titanium coating providing the best properties of the matte film.
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Research 3D scanner for scanning of problematic surfaces
Bátrla, Martin ; Mendřický, Radomír (referee) ; Koutecký, Tomáš (advisor)
This diploma thesis deals with design of 3D scanner for scanning problematic surfaces. The research part introduces the problem of 3D scanning and describes causes of random errors. Further, it contains a description and division of methods that leads to their elimination. The practical part of the thesis deals with design and description of hardware and software parts of the 3D scanner. The output of this work is device that is able to implement and compare quality of codification methods mainly for scanning of problematic surfaces. The functionality of equipment was verified by experimental measurement.
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Noncontact monitoring of dimensional accuracy of large-scale 3D printing
Paulíček, Jiří ; Mendřický, Radomír (referee) ; Koutecký, Tomáš (advisor)
This diploma thesis deals with a design and manufacture of a scanner that is used for online monitoring of a large-scale 3D printing of concrete mixtures. The aim is to design a scanner usable with an active print head designed at VUT. The scanner works on the principle of active laser triangulation, where a laser line is projected on an extruded material immediately behind the nozzle. The projection of the laser line on the extruded materiál is captured by a camera. During the design, FEM analysis was used due to the sizing of the main parts of the scanner depending on the deformations caused by the operating load. Excessive deformations would cause measurement inaccuracies. The height and width are calculated from the image in the MATLAB software. This manufactured scanner was tested during the printing of a real object.
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Design of a camera slider for shooting time-lapse shots with a focus on the object
Koupil, Michael ; Franke, Jakub (referee) ; Koutecký, Tomáš (advisor)
This Bachelor’s thesis deals with the constructional plan and implementation of the camera slider while using a 3D printer and Arduino platform. In theoretical part, there is an analysis of the commonly used camera sliders. Based on this analysis, several variations were prepared, and the most feasible constructional plan was chosen. In practical part, the aforementioned plan was worked out, safety calculations concerning selected nodes were made, as well as the mechanical drawing of the device. A prototype was then built and tested, whether it met all the requirements. The suggested device fulfils all the objectives of the Bachelor’s thesis.
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Experimental comparison of recycled and non-recycled filament of ABS plastic
Grygar, Filip ; Krčma, Martin (referee) ; Koutecký, Tomáš (advisor)
Plastic waste which arises from 3D print could be recycled. One of the most used materials is ABS with which this degree work deals. During recycling of ABS mechanical qualities rapidly deteriorate which is compensated by adding non-recycled ABS. This degree work dealt with a ratio of 25% of recycled to 75% of non-recycled material which is a ratio not have been tested so far, and most likely represents a boundary ratio when recycling still makes sense. Unfortunately, it was not possible to extrude from a recycled material a filament of high-quality enough which could be used for problem-free print. It was influenced by non-homogeneity of crushed components and the construction of an extruder. For improving the characteristics a more complex extruder would be needed, with a bigger screw diameter or with two screws, and also a cooling system with more zones. Professional grinders with screens would have to be used for improving homogeneity of the material. The melt flow index of the liquid alloy and the testing of the filament itself showed that this way is practicable and such a recycling is realistic.
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Methodology of injection mold design in the CATIA V5
Přikryl, Adam ; Koutecký, Tomáš (referee) ; Paloušek, David (advisor)
This bachelor's thesis descirbes the design solution of an injection mold for the cover of the cooling-air fan from the truck. Software Catia V5R19 is used for the design solution. First part of the bachelor's thesis describes basic information about injection molds, molding machines and injection cycle. Very solution of the thesis describes the proces of designing an injection mold for the specified plastic part. Part of the design is the 3D model of injection mold.
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Design of lower-limb prostheses
Koutecký, Tomáš ; Ždímal, Pavel (referee) ; Paloušek, David (advisor)
The goal of this bachelor's thesis is to give an overview of the current state of lower limb prostheses after amputation between the hip and the knee. It deals with the human gait, its analysis and with deviations in gait with the prosthesis. It also describes basic division of lower limb prostheses. The main part is the description of these prostheses designs and especially the design of main components and general overview of available types.
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Design of shell orthopedic insole fabricated by 3D printing
Chaloupka, Matyáš ; Koutecký, Tomáš (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with the design of shell orthopedic insole fabricated by 3D printing. The background research is focused on matters of pes planus and on the methods of Rapid Prototyping including most commonly used materials. The structural design is focused on designing a material pattern for this medical instrument and consequently modeling sandwich structure by combining two materials, plastic and softened plastic, which is then made using Rapid Prototyping on Fused Deposition Modeling 3D printer. Rhinoceros© was used for the purpose of making a shell orthopedic insole, especially it’s algorithmic editor tightly integrated with Rhino’s 3D modeling tools, Grasshopper®. Final part was made with sandwich structure by combining PLA plastic and Flex material using Rapid Prototyping.
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Study of surface coating possibilities for 3D scanning purposes
Franke, Jakub ; Mendřický, Radomír (referee) ; Koutecký, Tomáš (advisor)
This diploma thesis deals with matte coatings for 3D scanning purposes. The coatings are made with spray gun which uses a vibrating membrane atomizer and air blow gun. A suspension of titanium dioxide and alcohol is used as a coating material. This thesis describes the effect of the spray gun process parameters on the deposited coatings. These include, for example type of the coating suspension or setup of the blow gun. Phase Doppler Anemometry was used to measure spray characteristics. Deposited coatings were measured with profilometer and scanned with 3D scanner to study their thickness and effect on the results of 3D reconstruction. The result of this work was the coating with thickness below 1 µm with good optical properties for 3D scanning purposes. Standard deviation of the captured point cloud from the reference plane was below 0.0011 mm.
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