Copyright Goodheart-Willcox Co., Inc. 327 Chapter Summary Review Questions → Position tolerances are used to specify the required location accuracy for features of size. → Datum feature references are typically required on position tolerance specifi cations. → RFS is assumed on position tolerances and RMB is assumed on datum feature references. → The position tolerance zone for a hole is typically specifi ed as cylindrical in shape. → True positions for holes are defi ned with basic dimensions when position tolerances are applied to the holes. → The MMC and LMC modifi ers may be used to permit tolerance zones to increase, with the amount of increase dependent on the size of the unrelated actual mating envelope of the toleranced feature for MMC and the size of the unrelated actual minimum material envelope for LMC. → Two simple formulas permit the calculation of position tolerances for fi xed and fl oating fastener conditions. → Additional tolerance is available as a result of size variation from MMC or LMC when the MMC or LMC modifi er is applied. Additional tolerance permits signifi cant increase in the tolerance zone size, depending on the actual produced size of the controlled feature. → Inspection data showing coordinate measurements from produced parts may be used to calculate the position variation to determine if position tolerance requirements have been met. Coordinate measurements may also be plotted on grid paper to determine the amount of positional variation. → Position tolerances are not limited in application to simple through holes. They may be applied to counterbored holes, threaded holes, blind holes, width features of size, and bounded features. Answer the following questions using the information provided in this chapter. Additional review questions and problems are available in the Study Guide. Multiple Choice 1. One position tolerance specification may be used to control _____ at a time. A. one feature B. one or more features C. two or more features D. None of the above. 2. A feature control frame that specifies a position tolerance must include _____. A. a tolerance value B. a diameter symbol C. implied datums D. All of the above. 3. Which of the following is not true regarding position tolerance feature control frames? A. The geometric characteristic symbol is shown first. B. Implied datum feature references are permitted when applying a position tolerance to a pattern of features. C. The tolerance value is preceded by a diameter symbol when the tolerance zone is cylindrical. D. The tolerance value is followed by a material condition modifier when MMC or LMC is applicable. 4. RFS is assumed to be applicable on _____ unless indicated otherwise. A. position tolerance values B. coordinate tolerances C. size tolerances D. none of the tolerances 5. The best position tolerance zone shape to maximize the available tolerance for a round hole is _____. A. square B. rectangular C. cylindrical D. spherical