DETERMINE YOUR ORGANIZATION'S GDT EXPERTISE WITH THE CLASSIC TECH-TRAINING GDT QUIZ.

Maybe your organization already uses GDT. The question now is do they use it properly and do they know GDT by the latest 1994 Standard? To find out take the quiz yourself. Print it and let others take it. You will get a pretty good idea of where your peoples' level of GDT understanding is. If they do well, stay with what you have and accept our sincere congratulations for a job well done. If they had trouble with the quiz, they will have the same trouble with your or your customers' drawings. Changing drawings or rerunning or reworking production is the inevitable result of not using GDT properly. Our GDT training is the cost effective answer.

Now take the quiz. It and the answers are located below. You and your coworkers will probably learn a lot from it.

Questions
  1. What do these symbols stand for?
    a)b)c) Sd) ()e) f) g) h) i)

    j) k)l) m) n) o) p) q)r)

    Refer to the drawing above for questions 2-18
  2. What are the extremes of the thickness identified with 2?
  3. Describe the tolerance identified with 3.
  4. To what extent is the surface parallel to datum feature G without the tolerance indicated by 4?
  5. What control is provided by the tolerance indicated by 5?
  6. What type of tolerance is indicated by 6?
  7. What is the function of the top part of the feature control frame indicated by 7? What is its acronym? What does it stand for?
  8. What is the function of the bottom part of the feature control frame indicated by 8? What is its acronym? What does it stand for?
  9. Describe the radius control identified by 9.
  10. Describe the meaning of "1.5" in the feature control frame indicated by 10.
  11. What is the depth of the tapped hole adjacent to 11?
  12. What does the straightness tolerance indicated by 12 apply to? What is the allowable straightness tolerance if the shaft is 1.265?
  13. What is the virtual condition of the diameter indicated by 13?
  14. What part of the tapped hole indicated by 14 does its position tolerance apply to?
  15. What does the indicated by 15 require from the processing equipment used to simulate datum B?
  16. What is the FRTZF tolerance zone cylinder for the holes indicated by 16 if they are produced at .408? What is the PLTZF tolerance zone cylinder if the same holes are produced at .402?
  17. With all tolerances considered, what are the extremes of the dimension indicated by 17?
  18. What does the lack of a material condition modifier for the datum reference C indicated by 18 mean? What does this require from the processing equipment used to simulate datum C?
  19. What is the difference between and ?
  20. What letters of the alphabet should not be used as datum reference identifiers?
  21. What is the GDT datum reference frame used for? How is a part inspected if GDT is not used?
  22. If a hole diameter is identified as a datum reference, what is the actual datum?
  23. If the OD of a sphere is identified as a datum reference, what is the actual datum?

Answers

  1. a) At least material condition b) Position c)Spherical diameter d) Reference e) Projected tolerance zone f) Profile of a surface g) Maximum material condition h) Parallelism i) Free state j) Diameter k) Perpendicularity l) Cylindricity m) Between n) Tangent plane o) Symmetry p) Angularity q) Circularity r) Concentricity
  2. 2.00 - 2.04
  3. The indicated surface is entirely on or between two planes .12 apart and at 45 degrees to datum reference F. These planes are located within the limits of size.
  4. Within .04 due to the size (profile) tolerance.
  5. None. The size (profile) tolerance provides a flatness of .04 and the parallelism tolerance at 4 reduces it to .02 .
  6. Composite positional
  7. To locate the hole pattern. PLTZF. Pattern-locating tolerance zone framework.
  8. To locate the individual holes. FRTZF. Feature-relating tolerance zone framework.
  9. It is a controlled radius. The radiused surface must be on or between two arcs with radii of .23 and .27 that are tangent to the adjacent surfaces. The surface must also be a fair curve without reversals and all radii at all points on the contour shall fall within the radius size tolerance.
  10. A projected (beyond the surface) tolerance zone of 1.5 minimum length.
  11. 1.00 - 1.06 (see the tap callout)
  12. The axis of the shaft portion. .015
  13. 1.283
  14. The axis of the pitch cylinder.
  15. 1.280 (which is the MMC of B plus its .005 axial straightness tolerance)
  16. .020 and .028
  17. .0255
  18. RFS (regardless of feature size) applies. That it be adjustable in size to accommodate the full size range of C.
  19. indicates a tolerance that controls the profile of a surface and is for the profile of a line .
  20. I, O, and Q
  21. An accurate and repeatable set of surfaces to manufacture and inspect parts from. It is inspected set up any way the inspector desires. If he guesses differently from the intent of the drawing preparer, good parts could be rejected or bad parts accepted.
  22. The axis of the datum simulator.
  23. The center point of the datum simulator.

Back to the Tech-Training Home Page

Questions? E-mail us at tecsol@hiwaay.net