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Anastasios John Hart. Kurfess, Rebecca (Rebecca Ann) Massachusetts Institute of Technology. Department of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2017-12-05T19:18:16Z 2017-12-05T19:18:16Z 2017 2017 http://hdl.handle.net/1721.1/112559 1013184045 Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017. Cataloged from PDF version of thesis. Includes bibliographical references (pages 43-44). Parts made using Additive Manufacturing (AM) are limited in size to the build area of the 3D printer being used. Embedded elastically averaged locators can be used to join AM parts into assemblies, resulting in a piece larger than the build area, yet the design and placement of these locators must enable sufficient accuracy and repeatability of the couplings. In this thesis, locator design was formulated and verified using contact area, interference, and stiffness of the couplings as the design variables. A LEGO®-like coupling design was printed out of ABS on an Afinia H480 Fused Deposition Modeling (FDM) printer and measured with a ZEISS MICURA Coordinate Measuring Machine. The accuracy of each coupling was determined by measuring the radial misalignment between the base and the top of the coupling, and the repeatability of each coupling was determined by calculating the standard deviation of the radial misalignment after decoupling and re-coupling five times. The couplings were displayed accuracy on the order of 10 [mu]m and repeatability on the order of 1 [mu]m. Varying interference, contact area, and stiffness had a statistically insignificant effect of accuracy. Varying interference had a statistically insignificant effect on repeatability, increasing contact area increased repeatability by 0.75 [mu]m, or 15%, and increasing increased repeatability by 0.57 [mu]m, or 12%. by Rebecca Kurfess. S.B. 44 pages eng Massachusetts Institute of Technology MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. A parametric study of the repeatability of 3D printed LEGO®-like mechanical couplings Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="2b6b750a-f09d-4bb1-9791-37f4c47c870b"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>A parametric study of the repeatability of 3D printed LEGO®-like mechanical couplings</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2017</PublicationDate> <Authors> <Author> <DisplayName>Kurfess, Rebecca (Rebecca Ann)</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>Parts made using Additive Manufacturing (AM) are limited in size to the build area of the 3D printer being used. Embedded elastically averaged locators can be used to join AM parts into assemblies, resulting in a piece larger than the build area, yet the design and placement of these locators must enable sufficient accuracy and repeatability of the couplings. In this thesis, locator design was formulated and verified using contact area, interference, and stiffness of the couplings as the design variables. A LEGO®-like coupling design was printed out of ABS on an Afinia H480 Fused Deposition Modeling (FDM) printer and measured with a ZEISS MICURA Coordinate Measuring Machine. The accuracy of each coupling was determined by measuring the radial misalignment between the base and the top of the coupling, and the repeatability of each coupling was determined by calculating the standard deviation of the radial misalignment after decoupling and re-coupling five times. The couplings were displayed accuracy on the order of 10 [mu]m and repeatability on the order of 1 [mu]m. Varying interference, contact area, and stiffness had a statistically insignificant effect of accuracy. Varying interference had a statistically insignificant effect on repeatability, increasing contact area increased repeatability by 0.75 [mu]m, or 15%, and increasing increased repeatability by 0.57 [mu]m, or 12%.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>