329 Copyright Goodheart-Willcox Co., Inc. Chapter 8 Position Tolerancing Fundamentals 21. True or False? If one position tolerance is specified for a hole and counterbore, then the counterbore and the hole have the same size tolerance zone. Fill in the Blank 22. ____________ dimensions must be used to define the true positions for features that have position tolerances applied. 23. The ____________ and LMC modifiers permit the tolerance zone size to change in relationship to the produced feature size. 24. Rule # ____________ of the current standard requires that RFS be assumed as applicable on position tolerances when no modifier is shown. 25. A position tolerance zone for a hole is centered on the ____________ position of the hole. 26. A(n) ____________ fastener condition exists when a bolt passes through clearance holes in two parts. 27. A(n) ____________ tolerance zone extends outside the feature that is controlled. 28. A position tolerance applied to a noncylindrical feature of size should not include a(n) ____________ before the tolerance value in the feature control frame. Short Answer 29. Create a feature control frame to require position within a diameter of .026″ at MMC relative to datum feature A primary, B secondary, and C tertiary. 30. Create a feature control frame to require position within a diameter of .018″ at RFS relative to datum feature B primary, E secondary, and F tertiary. 31. Explain why implied datums are not permitted. 32. Explain what is meant by true position. 33. Show the formula used to calculate a position tolerance for a fixed fastener condition. 34. Show the formula used to calculate a position tolerance for a floating fastener condition. 35. Sketch the symbol for a projected tolerance zone. Application Problems Each of the following problems requires calculations related to position tolerances. All of the problems may be solved using the information contained in this chapter. 36. A hole specification and position tolerance are given. What is the allowable position tolerance for a hole produced at a .502″ diameter? 37. A hole specification and position tolerance are given. What is the allowable position tolerance for a hole produced at a .384″ diameter? 38. Calculate the position tolerance to be applied to the holes for two parts in a floating fastener application. Use the given information. Bolt MMC: .250″ Clearance Hole MMC: .281″ 39. Calculate the position tolerance to be applied to the holes for two parts in a floating fastener application. Use the given information. Bolt MMC: .190″ Clearance Hole MMC: .221″ 40. Calculate the position tolerance to be applied to the holes for two parts in a fixed fastener application. Use the given information. Bolt MMC: .164″ Clearance Hole MMC: .188″ 41. Calculate the position tolerance to be applied to the holes for two parts in a fixed fastener application. Use the given information. Bolt MMC: .190″ Clearance Hole MMC: .220″ 42. Calculate the required MMC clearance hole size for the given floating fastener application. Bolt MMC: .250″ Position Tolerance: .016″ 43. Calculate the required MMC clearance hole size for the given fixed fastener application. Bolt MMC: .312″ Position Tolerance: .018″