Discussion
A chain of four dimensions each of 50 mm with a tolerance of plus or minus 0.2 mm gives an overall length whose tolerance is
Answer: D
Correct answer: plus or minus 0.8 mm
In a chain each dimension is measured from the previous feature, so the position of the last is the sum of four independent dimensions and the worst-case tolerances add arithmetically: \[ 4 \times 0.2 = 0.8\ \text{mm}. \] This accumulation is the central drawback of chain dimensioning, and it grows with every link added.
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