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This paper presents a classroom example using 3D CAD models and 3D printed parts to teach key GD&T concepts: position tolerance zones, bonus tolerances, and designing functional gauges for inspection. Implemented in a CAD course with 45 sophomore students, the approach is delivered via lectures, models, diagrams, and calculations, followed by continuous improvements from faculty feedback and end-of-semester surveying.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/an-example-of-teaching-geometric-dimensioning-and-tolerancing-gdt-concepts-using-3d-printed-parts/650377/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/an-example-of-teaching-geometric-dimensioning-and-tolerancing-gdt-concepts-using-3d-printed-parts/650377.png","ImageObject",300,407,{"name":92,"@type":93},"AfterMidnight","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-10-24",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What GD&T concepts does the paper’s classroom example teach?","Question",{"text":112,"@type":113},"The example teaches datum simulators and bonus tolerances, as well as the difference between MMC and LMC, the use of cylindrical datums, position tolerance zones, and basic dimensions.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How is the functional gage for hole-pattern inspection determined?",{"text":117,"@type":113},"The functional gage is designed using the feature control frame and the MMC values for the hole and cylindrical datum A, then calculating the required pin diameter so accepted parts fall within tolerance.",{"name":119,"@type":110,"acceptedAnswer":120},"How was the example delivered and evaluated in the course?",{"text":121,"@type":113},"It was implemented in a sophomore-level CAD course, delivered to 45 students during Fall 2017 using lecture presentations and 3D models/printed parts, with outcomes and refinements based on faculty observations and an end-of-semester student survey.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},650377,1792900727,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":24,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144},962090896061,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","An Example of Teaching Geometric Dimensioning and Tolerancing (GD&T) Concepts using 3D Printed Parts  \nOziel Rios, Ph.D.  \nMechanical Engineering Department  \nThe Erik Jonsson School of Engineering and Computer Science (The Jonsson School)  \nThe University of Texas at Dallas  \n800 W. Campbell Rd., Richardson, TX, 75080, USA  \nE-mail: [oziel.rios@utdallas.edu](oziel.rios@utdallas.edu)  \nAbstract  \nGeometric Dimensioning and Tolerancing (GD&T) isan important tool for engineers to efficiently communicate design intent and requirements. GD&T has several advantages but can be difficult for students to learn due to the inherent 3D nature of the geometric tolerance zones. This paper describes an example of how 3D CAD models and 3D printed parts were used to illustrate several GD&T concepts including position tolerance zones, bonus tolerances, and designing functional gages for part inspection. The example described in this paper was implemented in a sophomore-level CAD course. The example was successfully delivered to a class of 45 students during the Fall 2017 semester. A description of the example is presented and, administering the example, requires simple 3D CAD modeling software and a 3D printer which are common in most engineering schools. Continuous improvements to the example are made based on faculty observations and assessments, as well as an endof-semester survey administered to the students.  \n1. Introduction  \nAt the University of Texas at Dallas (UTD), students are exposed to 3D modeling during their freshman year [1- 3] but are required to take a more intensive CAD course during the second semester of sophomore year or first semester of their junior year. This CAD course covers 3D part and assembly modeling, parametric curve and surface modeling, preparing fabrication packages for traditional and additive manufacturing, and learning about conventional and geometric tolerancing.  \nA survey of the literature highlights the importance of Geometric Dimensioning and Tolerancing (GD&T) including reducing costs by decreasing waste, producing components that are interchangeable, and allows designers  \nto more clearly communicate functional relationships between features in drawings [4-7] . However, GD&T concepts can be difficult for students to learn not only because of the many symbols and terminology implemented by this graphical language but also because it may be difficult to comprehend the 3D nature of geometric tolerance zones.  \nIn the rest of this paper, a detailed description of an example to illustrate the concepts of position tolerances and bonus tolerances resulting when MMC is applied is provided. These concepts are illustrated to the students with 3D models, 2D diagrams and 3D printed parts. All necessary calculations are also presented. Finally, results from a student survey are presented.  \n2. Description of Example Problem  \nIn this problem, a functional gage to inspect a circular hole pattern of the component shown in Fig. 1 needs to be designed. The objective was to create an example to teach the concepts of datum simulators and bonus tolerances. The example also teaches the difference between MMC and LMC, the use of cylindrical datums, position tolerance zones, and basic dimensions. This example was taught to a class of 45 students in Fall 2017 semester. The rest of this section explains how the example was presented in lecture.  \nTo begin, we will assume the size tolerances of the holes and cylindrical surface A have been verified to be within tolerance. What we are trying to determine in this example, is how to determine if the location of the hole pattern is within tolerance. Additionally, in this example the tolerances were purposely chosen to be large in value for illustration purposes. Real-world applications may implement smaller tolerance values but the reasoning and calculations involved would be the same.  \nFig. 1, The component with a circular hole pattern dimensioned in units of inches. Dimensio","cbCaih811vAuQE0D","https://ap.wps.com/l/cbCaih811vAuQE0D","pdf",638397,"English","# Introduction\n# Description of Example Problem","[{\"question\":\"What GD\\u0026T concepts does the paper’s classroom example teach?\",\"answer\":\"The example teaches datum simulators and bonus tolerances, as well as the difference between MMC and LMC, the use of cylindrical datums, position tolerance zones, and basic dimensions.\"},{\"question\":\"How is the functional gage for hole-pattern inspection determined?\",\"answer\":\"The functional gage is designed using the feature control frame and the MMC values for the hole and cylindrical datum A, then calculating the required pin diameter so accepted parts fall within tolerance.\"},{\"question\":\"How was the example delivered and evaluated in the course?\",\"answer\":\"It was implemented in a sophomore-level CAD course, delivered to 45 students during Fall 2017 using lecture presentations and 3D models/printed parts, with outcomes and refinements based on faculty observations and an end-of-semester student survey.\"}]","An Example of Teaching Geometric Dimensioning and Tolerancing (GD&T) Concepts using 3D Printed Parts | PDF",1792825029,13]