The Geometrical Tolerancing Desk Reference: Creating and Interpreting ISO Standard Technical Drawings
By Paul Green

Chapter 5: Tolerance Frame

Geometrical tolerances are placed in a rectangular frame in various forms as shown below:

Example 1: Without datum
Example 2: With datum
Example 3: With multiple datum references
Example 4: With MMR (maximum material requirement) applicable to the tolerance
Example 5: With MMR applicable to the datum reference
Example 6: With MMR applicable to both the tolerance and the datum reference
Example 7: With MMR applicable to the tolerance and more than one datum reference
Example 8: When the tolerance is restricted to a length of a feature
Example 9: When the tolerance is restricted to the whole feature and a length of the feature
Example 10: With MMR applicable to the tolerance and more than one datum reference (the sequence of either datum is of no importance)
Example 11: When the tolerance applies to more than one feature
Example 12: To specify the form of the feature within the tolerance zone
Example 13: To specify a spherical tolerance zone
Example 14: More than one tolerance frame for one feature
Example 15: When the form of the feature is a line instead of a surface
Example 16: A single tolerance zone applying to several separate features (common zone)
Example 17: A profile characteristic applying to the entire outline of the cross-sections
Example 18: A profile characteristic applying to the entire surface
Copyright Paul Green 2005 under license agreement with Books24x7
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