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Level 2:  Advanced Geometric Dimensioning and

Tolerancing for Sheet Metal and Flexible Parts 

[per ASME Y14.5M-1994]



After attending this course, participants will be able to . . .

·  Choose the most appropriate three-dimensional geometric characteristic symbology for sheet metal and other flexible products based on part functionality, ease of manufacture and inspectability.


·  Choose and apply the most appropriate datums to stabilize sheet metal and other flexible parts both for in-process manufacture and final part function.


·  Determine the most effective blend of geometric symbology and plus and minus tolerancing and still be in compliance with the ASME Y14.5M-1994 standard.  


·  Determine the full effects of the use of the MMC, LMC and RFS material condition concepts and their impact on function, manufacturing, inspection and cost.


·  Use Concurrent Engineering methodology to apply geometrics to improve quality, interdepartmental communication and cooperation, manufacturability and product assembly.


·  Apply the problem-solving techniques specifically applicable to flexible parts and parts prone to free state variation.  

·  Know the relationship between datum usage, MMC, RFS and LMC on part fixturing, assembly and gaging.  


Who Should Attend?  This course is directed to anyone who works with engineering drawings in the sheet metal and other flexible parts industries.  Prerequisite:  attendees should have a basic working knowledge of ASME Y14.5M-1994 and be able to accurately interpret fundamental principles and concepts of Geometric Dimensioning and Tolerancing.  


What Will This Course Cover?     

Course participants will be trained on how to apply geometric tolerancing (per ASME Y14.5) to sheet metal and plastic molded parts and prints.  In addition to reviewing basic Geometric Dimensioning and Tolerancing concepts and principles, the course will focus on the application and interpretation of geometric tolerancing applied to sheet metal and plastic molded parts.  Different and unique problems in tolerancing, designing, manufacturing and inspecting these types of parts will be addressed.  

The use of a sample drawing package (of your product drawings) is a key element of this course as a guide to the tailoring of information covered.  We wish to optimize time spent in this course; therefore, a packet of engineering drawings representative of your products’ geometric shapes is requested prior to the workshop—for the instructor to study/incorporate into his lesson plan.  Additionally, any sample parts and mating parts brought to the classroom would be extremely effective for training.  


Course Length: For an on-site program tailored to your specific needs that will include your engineering drawings, we recommend a course length of 4 days.  



General Course Outline by James D. Meadows for:  

Geometric Tolerancing for Sheet Metal and/or

 Flexible Parts  [per ASME Y14.5M-1994]  


Geometric Principles as Applied to Sheet Metal and Flexible/Plastic Molded Parts

·  Plus and minus tolerances; Legal and useful advantages vs. illegal use and disadvantages

·  Size

·  Creating a datum reference frame for flexible parts

·  Creating a datum reference frame for parts with draft angle

·  Tolerancing sheet metal parts to mate with other sheet metal parts vs. a variety of other materials

·  MMC vs. LMC vs. RFS; Advantages of each for castings, molded parts, sheet metal, breakout/wall thickness problems, mating features, fixturing, cost and tolerance stack-up analysis software packages currently available

·  Virtual condition vs. resultant condition

·  Form and orientation; When to use geometric symbology and when it is not necessary or advantageous

·  Profile and position for sheet metal and plastic molded parts

·  Restrained vs. free state controls on flexible parts

·  Datum targets; Points, lines and areas to stabilize difficult part configurations

·  Use of chain lines

·  Compound datums

·  Pattern datums

·  Compound-pattern datums on irregular shaped sheet metal parts; Functionally toleranced, a guide to manufacture and how to inspect

·  Combining plane surfaces, features of size and datum targets to establish a datum reference frame

·  Tolerancing for in-process considerations and final functional requirements

·  Simultaneous vs. separate gaging requirements

·  Composite vs. two single-segment controls of profile and position

·  Direct vs. indirect tolerance relationships


Manufacturing  and Verification

·  Check fixtures and holding fixtures; Expanding vs. fixed size pins

·  CMM’s; How to get the best, most repeatable results

·  Surface plate equipment and how to best use it

·  Functional gaging; During manufacture, in presses vs. after the fact for holding a close Cpk and for attribute data collection

·  Soft functional gaging for profiles and position for variable data collection

 Case Studies

·  Large panels

·  Assemblies

·  Light gage

·  Heavy gage

·  Plastic parts  

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