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An air disc brake is being measured for thickness variation.

Tech A says two dial indicators can be used.

Tech B says an outside micrometer can be used.

Who is correct?

Answer :

Final answer:

Tech A's method using two dial indicators is suited for measuring thickness variation in an air disc brake, while Tech B suggests an outside micrometer, which can measure absolute thickness, but not variation as efficiently.

Explanation:

When measuring the thickness variation of an air disc brake, Tech A is correct that two dial indicators can be used. These indicators can compare the thickness at different points on the disc to find variation. Tech B suggests using an outside micrometer, which could measure the absolute thickness at a given point, but may not be as efficient for measuring variation over the disc surface. In this context, using dial indicators would likely provide a more direct assessment of thickness variation, as they can be set up to measure at multiple points simultaneously, which is similar to measuring whether two pieces of glass are the same thickness without needing their individual thicknesses.

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