ENGINEERING TOOLS & METHODS
The Datum System • When to use the datum system. • Advantages of the datum system. • Common misconceptions about the datum system. • Common errors in datum usage
Conical Tolerance Zones • A conical tolerance zone and advantage of use • Specifying a conical tolerance zone in a tolerance of position application • When to use tolerance of position with a conical tolerance zone Profile Tolerances • Myths about profile controls • When to use a profile control • The four characteristics profile can control • Converting coordinate tolerances into profile callouts • The profile datum rule Profile and Simultaneous Requirements • Simultaneous requirement applied to profile • Profile controls with separate requirements Composite Profile Tolerancing • Composite profile tolerancing, rules, and advantages • Interpreting a composite profile application Multiple Single-Segment Profile Tolerancing • Rules, advantages, interpretation, when to use it • Profile vs. a composite profile tolerance Advanced GD&T Competencies: Composite Positioning 1.5 Hours | Web Seminar or On Demand Course I.D.# WB1321 or I.D.# PD331321ON While the basics of position are covered in a standard Geometric Dimensioning & Tolerancing (GD&T) course, and sometimes a lone example of composite position is given, those discussions often overlook the variations allowed that enable more accurate control based on part function. This advanced web seminar will clarify the proper use of “double-decker” position controls in GD&T. There are two distinct types: composite position (one symbol) and two single-segment position controls (two symbols). These are commonly used to locate patterns of features (bolt circles, etc.), but they are rarely taught in any depth. In this course, participants will learn the difference in showing one vs. two position symbols and the importance of the datum references in understanding each meaning, per the ASME Y14.5-2009 standard. Many samples will be shown of the proper tolerancing of patterns of holes and pins that use each method. Examples and exercises Course summary Instructor: Fee: $1795 ASME GDTP Senior Certified Trainer 2 CEUs URL: sae.org/learn/content/et2011/
Datum Feature Types • Common datum feature types • When each datum feature type is typically used • Degrees of freedom restrained when each datum feature type is used • The datum feature simulator for the datum features referenced in a geometric tolerance Datum Targets • Reducing the impact that using datum targets has on functional dimensioning • Application requirements • Applications where datum targets should be used • Specifying fixed and movable datum targets • Special datum target types • Dimensioning a simulated gage for datum target applications Specialized Datum Applications • Specifying a screw thread as a datum feature and interpreting application • Specifying a gear or spline feature as a datum feature and interpreting application • Temporary and permanent datum features • Major disadvantage of temporary datum features Tolerance of Position Usage • When to use a tolerance of position control • Loss function curve, customer robust dimension, and customer sensitive dimension • Tolerance of position control and material condition used Simultaneous and Separate Requirements • Simultaneous and separate requirements, effects and where they apply • Tolerance of position at MMC simultaneous requirement • Tolerance of position controls as separate requirements • One exception to the simultaneous requirement
Composite Position Tolerancing • Rules, advantages, and when to use it • “FRITZ” and “PLTZF” • Tolerance of position composite application
Multiple Single-Segment Tolerance of Position Tolerancing • Rules, advantages, and when to use it • Tolerance of position vs. composite tolerance of position
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