Explain where datum shift is additive to a geometric tolerance and where it is not.
What will be an ideal response?
ANS:
Examples of where a datum shift is additive to a geometric tolerance and where a datum shift is not additive to a geometric tolerance are:
1. Coaxial diameters toleranced relative to each other—one is the toleranced diameter; the other is the datum feature referenced at MMB. In this case, the datum shift is additive to the geometric tolerance.
2. A pattern of holes toleranced relative to a datum feature at MMB—the datum shift only affects the location of the pattern (as a group) relative to the datum axis. The datum shift does not affect the spacing tolerance between the holes within the pattern.
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