List the three conditions that apply where parallelism is applied to a diameter at RFS.
What will be an ideal response?
ANS:
Where parallelism is applied to a diameter at RFS, the following conditions apply:
1. A diameter symbol may be used in the feature control frame to indicate that the tolerance zone is the space within a cylinder.
2. The tolerance zone is parallel to the primary datum plane.
3. The axis of the unrelated actual mating envelope must be located within the tolerance zone.
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