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13DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014I Know EverythingAbout GD&T Except Thomas Allsup

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Thomas Allsup2About the Presenter Eighth time SWWorld Attendee Fifth time presenter Co-chair of North Texas SolidWorks UsersGroup BSME Oklahoma State University MSME University of Texas at Arlington Partner at Anida Technologies, L.P., aDallas based engineering consultingcompany. GD&T Aficionado

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014We Know Everything About 3Languages Learning a new language is hard enough without having to learn the rules andthe exceptions at the same time. All languages have rules and exceptions See Dick.See Jane.See Dick and Jane. except after C and sometimes Y

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014We Know Everything About GD&T4Good Starting Position When I teach GD&T, especially to beginners, I try desperately to avoid talkingabout the exceptions. This year we are starting with the idea that we all know all the GD&T rules. Now let’s screw everything up by reviewing the exceptions Just like any language, there’s a lot of contradictions. Contradictions normally require memorization There is not going to be a test at the end

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Previously at SolidWorks World.5Check the archives 2009 How to Spell GD&T Introduced FOPRL Chart 2010 The Revenge of the Circled Letters Modifiers 2013 Hitchhiker’s Guide to GD&T Tolerance Zones and Shapes 2014 The Big GD&T Theory Datums and Basic Dimensions

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014A Nice Flow of Information6Squirrel! One of the hallmarks of a good presentation is a nice logical flow of informationthat builds from the first slide to the next. In fact, you will be asked at the end of this presentation to provide an evaluationusing your mobile apps. Please be kind. This presentation is a list of exceptions to rules that defies logical grouping. In fact, I normally discourage questions until the end but please stop me as wego this morning. With those disclaimers, let’s get started

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014There Can Be Only One 7ASME Standard ASME Y14.5 1994? 2009? ISO1101?

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014IBRA Threat to the Standard?ASME is a Standards Development Organization (SDO)SDO’s develop “voluntary consensus standards”SDOs have substantial costs for developing and maintaining standardsCurrently revenues from the sales and licensing of copyrighted standards help fundSDOs (along with training and certification) If the IBR (Incorporated by Reference) – Code of Federal Regulations (CFR) lawsuitwins its appeals process then all the engineering standards will become publicdomain This will affect ASME (and IEEE and a multitude of other SDO’s) business model Good news is the standards might be free in the future Bad news is you get what you pay for 8

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Reference to Gaging ASME Y14.5 is a drawing standard, not a gaging standard. Section 1.1.6 states that any gaging discussed is for illustration purposes only ASME Y14.43 Dimensioning and Tolerancing Principles for Gages and Fixturestells you how to make gages and fixtures ASME B89 is collection of metrology standards that tell you how to measure B89.3.1 Roundness B89.3.4 Axes of Rotation B89.3.7 Surface Plates B89.7.2 Measurement Planning9

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Metric Units101.1.2 “Metric units are expected to supersede Standard units” There is only three countries in the world that don’t use metric system. Extra points if you can name one country. Liberia, Myanmar and of course, the United States of America Thanks Jimmy Carter and his short lived “United States Metric Board” Interestingly the bill was signed by President Ford and unfunded under President Reagan. There are still a lot of engineering drawings that use inches. Use IN for the abbreviation of inches Use mm for millimeters

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Only Capital Letters11All notes, title block entries, dimensions only use capital lettersexcept Metric units which must use appropriate upper and lower case. “m” is milli or one thousandth “M” is Mega is 100,000X I have absolutely no idea how far a MM is? mm not MM

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Boundary12 Datums are theoretical so they don’t have physical size or “condition” so MMC,LMC, and regardless of feature size were deemed inappropriate starting in 2009. Datums now have: Maximum Material Boundary (MMB) Least Material Boundary (LMB) Regardless of Material Boundary (RMB) I will probably never get used to calling datums MMB instead of MMC.

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014SolidWorks World 201513Obligatory SolidWorks Slide The concept of regardless offeature size is still in the current2009 standard. The symbol has not beenacceptable on drawings since 1994. So why is it still on symbol palette? In that same vein, why isn’t “I” and“CF” isn’t on the palette?

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Definition of Tolerance Zone143.6 Feature control frames are always total widetolerance unless . You add a diameter or spherical diameter symbol tochange the total wide to a cylindrical or spherical tolerancezone. Maybe this causes a bad flashback to SWW 2013Hitchhiker’s Guide to GD&T Tolerance Zones and Shapes

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Envelope Principal152.7.1 Limits of size is first magnitude of control and is always ineffect exceptThis is sometimes called the first rule of GD&T – geometric controls are arefinement of control. 2.7.1 Independent Modifier 2.72 Stock pieces 2.73 Free State Variation is applied

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Independent Example16

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Stock Size171.4(h) All dimensions have tolerances unlessidentified as stock size. If you buy a 2 x 4 piece of wood 20 AWG wire 16 Ga sheet of steelThen the size of the stock item and any expectedtolerances are defined by where you buy them!Caveat emptor (Buyer Beware)

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Free State18All dimensions and tolerances apply in the free state condition except 4.20 Restrained Condition Heh heh heh - he said 420 5.5 Free State Modifier You can’t restrain a part to measure it My apologies to Werner Heisenberg butmeasuring something doesn’t necessarilyaffect the measurement.F

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Tolerances Across Surface or Edge19You only measure the surface or edge of the part you wish to inspectexcept 7.4.1 Projected Tolerance Zone Moves the tolerance inside the part to someplace off the part out in space - hence the nameProjected Tolerance Zone. Projected Tolerance Zone only works on the three orientation controls applied to a feature ofsize and position. Tangent Plane You measure a gage block placed on the surface to measure instead of the surface itself.

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Projected Tolerance Example20

213DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Tangent PlaneExample

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Tolerances Apply to Full Feature1.4 (n) All tolerances apply for full depth, length, and width of thefeature. Well except for four things: Between Symbol Limits where the tolerance starts and stops along a features length. All Around and All Over Leader Modifiers Extends tolerances to all the edges in a place or all over the part. Per Length or Per Area Controls Allows for more tolerances locally while limiting the overall tolerance Separate Features A disjointed surface can be treated as a single surface.22

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Between Symbol Example23

243DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014All AroundExample

253DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014All OverExample

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Straightness Per Length Example26

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Flatness per Area Example27

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Separate FeaturesContinuous Features28

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Symmetrical Outlines29 1.8.9 Centerline not the same as GD&T control symmetry Incidentally, the symbol CL has been replaced with a “equal sign” on the centerline somewhere along the away. Imagine me saying in an old man voice “I don’t like that change”

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Datum Feature Symbols303.3.2 Use any letter except: I O Q I personally don’t like S or Z either but that’s for another day If you run out of A through Z then you can use AA through AZ. I have friends who like “R” for runout datums and prefer “X-Y-Z” to “A-B-C” I might need new friends.

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Straightness of MMC31You can’t use modifiers on geometric form controls. Well except for straightness If it is applied to a feature of size Then you can use a MMC Section 5.4.1.2

323DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Straightnessat MMC Example

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014SEP REQT334.19 All feature control frames that have the same datums listed inthe same order with the same modifiers have meet thererequirements at the same time. That is unless you state a tolerance is a SEP REQT Huh? All this means is the inspector would normally require the same set-up and youare allowing the part may be set-up in one or more means.

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014Separate Requirements Example34

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 2014SIM REQT35Even if two or more feature control frames have different datums andthe same datums with different modifiers listed in a different order orwith the different modifiers, you can make the requirements at thesame time by stating it must be a SIM REQT. Huh? All this means is the inspection must be done from the same setup.

3DS.COM/SOLIDWORKS Dassault Systèmes Confidential Information 2/10/2015 ref.: 3DS Document 201436BidirectionalTolerance Example All controls provide tolerancesthat are equally disposed on bothsides of the nominal