208 GD&T: Application and Interpretation
Copyright Goodheart-Willcox Co., Inc.
33. A movable datum target symbol indicates
that the target simulator must ____________
to make contact with the part.
Short Answer
34. Explain the difference between a datum
feature and a datum.
35. When basic dimensions are shown between
datum targets, what is the tolerance on the
location of those targets?
36. How can a datum plane be simulated when
the datum feature is a fl at external surface?
37. When is it necessary to show material
boundary modifi ers on datum feature
references?
38. Explain how to establish a primary datum
axis when a hole has been referenced at
MMB.
39. The size of a datum target area should
not be arbitrary. Explain how at least one
consideration impacts the size of a target
area.
40. Explain why the only two target points on a
fl at surface, labeled E1 and E2, should not be
referenced as a primary datum.
Application Problems
Some of the following problems require that a sketch be
made. All sketches should be neat and easily readable.
Each problem description requires the addition of some
dimensions or symbols for completion of the problem.
Complete the actions defi ned in the instructions in a
manner that is in compliance with dimensioning and
tolerancing requirements.
41. Identify the top surface on the given part as
datum feature A.
42. Identify the bottom surface on the given part
as datum feature B.
43. Identify the right side surface on the given
part as datum feature C.
44. Identify the small diameter as datum feature
A to establish a datum axis.
45. Identify the large diameter as datum feature
B to establish a datum axis.
46. Identify the right end surface on the given
shaft as datum feature C.
Top
Bottom
Right side
Top
Bottom
Right side
Right side
Bottom
Top
Right end
Right end
Right end