Discussion
For that same component, dimensioning from a datum instead holds the last feature's position to
Answer: A
Correct answer: plus or minus 0.2 mm
Measuring from a datum makes each feature’s position depend on one dimension only, so the last hole is held to the tolerance of its own dimension - plus or minus 0.2 mm - regardless of how many features lie between it and the datum. Compare the chain arrangement, where the same tolerances accumulate to plus or minus 0.8 mm.
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