[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-664837-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-664837-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","lecture-01-part-2-geometric-tolerances-dr-saqib","Lecture 01 Part 2 - Geometric Tolerances - Dr Saqib","","Lecture material explains the fundamentals of geometrical tolerances used in technical drawings. It defines what dimensions represent and why tolerances are needed to account for manufacturing variation. The lecture contrasts dimensional and geometric tolerances, emphasizing that geometric controls shape and position and is applied when functional interchangeability or critical requirements are involved. It then introduces the feature control frame, describes how to read it, and covers form-related geometric tolerances including flatness and straightness with practical usage contexts.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/lecture-01-part-2-geometric-tolerances-dr-saqib/664837/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/lecture-01-part-2-geometric-tolerances-dr-saqib/664837.png","ImageObject",300,407,{"name":42,"@type":43},"Marglet","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-10-29",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",5,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What is the difference between a dimension and a tolerance?","Question",{"text":63,"@type":64},"A dimension is a nominal value expressed with units on a drawing to define size or geometric characteristic. A tolerance is the permitted variation range, defined as the difference between maximum and minimum limits.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How do dimensional and geometric tolerances differ?",{"text":68,"@type":64},"Dimensional tolerance specifies permitted variation in size. Geometric tolerance specifies permitted variation from the true geometric form or position for critical requirements.",{"name":70,"@type":61,"acceptedAnswer":71},"What are the components of a feature control frame, and how is it used?",{"text":72,"@type":64},"A feature control frame prescribes a geometric tolerance using (1) a tolerance symbol, (2) a tolerance value, and (3) datum labels for the reference frame. It limits variation in the required geometric relationship, such as perpendicularity, with respect to a specified datum axis.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},664837,1793275195,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":102,"slug":103},6,50,"technology",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},7,"Healthcare",40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":55,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":101,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":139,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":80,"read_time":144},2336477982702,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Geometrical Tolerances  \nMain references and sources for the contents of this lecture  \n[http://www.gdandtbasics.com/gdt-symbols/](http://www.gdandtbasics.com/gdt-symbols/)  \n[http://www.engineeringessentials.com/gdt/](http://www.engineeringessentials.com/gdt/)  \nDimension  \nA dimension is \"a numerical value expressed in appropriate units of measure and indicated on a drawing and in other documents along with lines, symbols, and notes to define the size or geometric characteristic, or both, of a part or part feature\"  \nDimensions on part drawings represent nominal or basic sizes of the part and its features.  \nThe dimension indicates the part size desired by the designer, if the part could be made with no errors or variations in the manufacturing process  \nTolerances  \nA tolerance is \"the total amount by which a specific dimension is permitted to vary. The tolerance is the difference between the maximum and minimum limits\"  \nVariations occur in any manufacturing process, which are manifested as variations in part size  \nTolerances are used to define the limits of the allowed variation  \nTypes of Tolerances  \nA Dimensional tolerance is the total amount a specific dimension is permitted to vary, which is the difference between maximum and minimum permitted limits of size.  \nA Geometric tolerance is the maximum or minimum variation from true geometric form or position that may be permitted in manufacture.  \nGeometric tolerance should be employed only for those requirements of a part critical to its functioning or interchangeability. These are much more difficult to measure/verify as compared to dimensional tolerances.  \nOverview of Geometric Tolerances  \nGeometric tolerances define the shape of a feature as opposed to its size.  \nWe will focus on three basic types of geometric tolerances  \nFeature Control Frame  \nA geometric tolerance is prescribed using a feature control frame. It has three components:  \n1 . the tolerance symbol,  \n2 . the tolerance value,  \n3 . the datum labels for the reference frame.  \nFeature Control Frame  \n◼ How do you read this feature control frame?  \n“The specified feature must lie perpendicular within a tolerance zone of 0.05 diameter at the maximum material condition, with respect to datum axis C.”  \nIn other words, this places a limit on the amount of variation in perpendicularity between the feature axis and the datum axis. In a drawing, this feature control frame would accompany dimensional tolerances that control the feature size and position.  \nGeometrical Tolerances (Form)  \nAll the points on the indicated surface must lie in a single plane, within the specified tolerance zone  \nThe flatness tolerance defines a distance between parallel planes that must contain the highest and lowest points on a face.  \nFlatness  \nFlatness tolerance is typically used for sliding surfaces, sealing surfaces, and appearance, etc.  \nGeometrical Tolerances (Form)  \nAll the points on the indicated surface or axis must lie in a straight line in the direction shown, within the specified tolerance zone  \nStraightness tolerancing is typically applied to a cylindrical features (pins, shafts, bars,etc.) to control bowing and other distortions.","cbCaiaLPCvAw26rx","https://ap.wps.com/l/cbCaiaLPCvAw26rx","pdf",1844566,33,"English","# Geometrical Tolerances\n## Dimension and Nominal Sizes\n## Tolerances and Their Purpose\n## Types of Tolerances\n## Overview of Geometric Tolerances\n## Feature Control Frame\n## Geometrical Tolerances (Form): Flatness\n## Geometrical Tolerances (Form): Straightness","[{\"question\":\"What is the difference between a dimension and a tolerance?\",\"answer\":\"A dimension is a nominal value expressed with units on a drawing to define size or geometric characteristic. A tolerance is the permitted variation range, defined as the difference between maximum and minimum limits.\"},{\"question\":\"How do dimensional and geometric tolerances differ?\",\"answer\":\"Dimensional tolerance specifies permitted variation in size. Geometric tolerance specifies permitted variation from the true geometric form or position for critical requirements.\"},{\"question\":\"What are the components of a feature control frame, and how is it used?\",\"answer\":\"A feature control frame prescribes a geometric tolerance using (1) a tolerance symbol, (2) a tolerance value, and (3) datum labels for the reference frame. It limits variation in the required geometric relationship, such as perpendicularity, with respect to a specified datum axis.\"}]","Lecture 01 Part 2 - Geometric Tolerances - Dr Saqib | PDF",83]