Discussion
Which consequence follows from fitting a new pinion to an old crown wheel?
Answer: B
The lapped surfaces are matched to one another, so an unmatched pair has an incorrect contact pattern that no adjustment can fully correct. Noise and rapid wear follow. This is why the matched numbers stamped on the components must be checked. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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