Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Introduction to Geometric Dimensioning &Tolerancing Instructor: Dan Dolan Assistant: Mark Sauder August 4, 2006

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Schedule for the day 8:00 Introductions 8:15 Design Intent Fundamental Philosophy of GD&T (Why GD&T) ANSI/ASME 14.5 (1994 reaffirmed in 2004) Datums Position tolerance theory (diametral tolerance zone) 10:00 Break 10:15 The concept of mating parts Material condition modifiers Virtual Condition Resultant condition Examples 12:00 Lunch 1:00 Fixed fastener formula Floating fastener formula Examples Form tolerances 2:30 Break 2:45 Orientation tolerances 3:30 Summary 3:45 Trial certification test

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Introduction Dan Dolan –Personal Married, 1 son a senior at U of MN in ME Hobbies –Autocross racing –Trap shooting –Playing Bluegrass guitar –Director of CAMP Program director Advisor for FSAE, Mini Baja, SAE Aero Design, UAV –Professor of Mechanical Engineering (for 25 years) Pre Engineering at St. Johns (took drafting class) BMechE with High Distinction from U of MN 1970 MS in ME 1975 U of MN PhD U of MN 1977 Have taught CAD/CAM for 18 years

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Design Intent Material Level of quality Relationships Examples on the board

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Fundamental Philosophy of GD&T (Why GD&T) It is a standard (very similar to ISO) It helps communicate design intent It could help save money

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Datum A theoretically exact point, axis, or plane derived from the true geometric counterpart of a specified datum feature. A datum is the origin from which the location or geometric characteristics of features of a part are established.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Datum Feature An actual feature of a part that is used to establish a datum

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Datum Feature Simulator A surface of adequately precise form (such as a surface plate, a gage surface, or a mandrel [or a CNC machine axis] contacting the datum feature(s) and used to establish the simulated datum(s).

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Simulated Datum A point, axis, or plane established by processing or inspection equipment, such as the following simulators: a surface plate, a gage surface, or a mandrel

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Datum Target A specified point, line, or area on a part used to establish a datum

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Possibilities for **

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Possibilities for **

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY From ASME 14.5, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From Foster, Geometrics III, Addison-Wesley, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From Foster, Geometrics III, Addison-Wesley, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From Foster, Geometrics III, Addison-Wesley, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From Foster, Geometrics III, Addison-Wesley, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From Foster, Geometrics III, Addison-Wesley, 1994.

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From Foster, Geometrics III, Addison-Wesley, p201

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From TMEH

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Position tolerance theory From TMEH

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Bonus tolerance The additional position tolerance gained as the feature moves away from the set material condition modifier

Center for Advanced Manufacturing and Production SOUTH DAKOTA SCHOOL OF MINES & TECHNOLOGY Coordinate – position conversion From Foster, Geometrics III, Addison-Wesley, 1994.