Bill Tandler 0000-00-00 00:00:00
GD&T QUIZ SURPRISE! IT’S A GD&T POP QUIZ. Now it’s time to find out where we are. Here is a little quiz that touches on some of the things we covered in our first ten workshops. The next workshop in the December issue will provide detailed answers and explanations to turn the quiz into an important learning opportunity. Have fun! GD&T QUIZ Based on the ASME Y14.5 2009 Standard - 3rd Angle Projection Purpose: To help you confirm your grasp of the fundamental concepts, tools, rules and processes of GD&T defined by the ASME Y14.5 2009 Standard.Note: The forbidden modifier (S) is used here explicitly to enhance clarity." 1. Name the following Geometry Control Tools 2. At the left end of the lines below, enter the names of the four fundamental groups of geometric characteristics that describe the four things that can go wrong with machine part features. On the right, enter the symbols of the Y14.5 tools dedicated to each group. 3. What geometric characteristics can the Surface Profile tool control? 4. What is the shape of every Surface Profile tolerance zone? 5. GD&T controls the imperfect real world with the help of a perfect imaginary world. Name some of the components of the perfect imaginary world of GD&T. 6. What are the only two purposes Basic dimensions serve? 7. On a separate piece of paper, decode each of the following Feature Control Frames found in the drawing below, in order to make the stated requirements absolutely clear and avoid the dangers of “interpretation”: 8. Describe in words and draw in the shapes of the tolerance zones defined by the numbered Feature Control Frames. 9. Referring to Feature Control Frame 8.6 in the figure above: 9.1 Provide a detailed name for the symbol (M) and compute the maximum permissible Position tolerance: 9.2 Provide a detailed name for the symbol (S) and describe its impact on the Simulator for Datum Feature C: 9.3 Draw in and label the axes of the Datum Reference Frame defined by the Datum Feature sequence A,B,C. 9.4. Given that this feature is a bore and can suffer problems with its size, form, orientation and location, explain how only a size tool and a location tool are able to impose all the necessary controls: 10. Define a Datum Feature: 11. Define a Datum Feature Simulator: 12. Define a Datum: 13. Define a Datum Reference Frame: 14. Think carefully about the function of a rivet and the functions of each of its features. Then, on a separate piece of paper, recreate the drawing and use whatever Y14.5 tools you feel are appropriate to control its geometry and add some explanations for your choice of Datum Features and Geometry Control Tools. We’ll discuss various alternatives in the December column. Congratulations! You’ve been GD&T-ized. Bill Tandler is the president and chief technical officer of Multi Metrics Inc. (Menlo Park, CA). He can be reached at GdandTWorkshop@qualitymag.com or (650) 328-0200.
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