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Answer :
Final answer:
The best tool to measure the diameter of a crankshaft journal is a micrometer due to its high precision and suitability for small measurements. While dial calipers also measure diameters, they are not as accurate as micrometers. Other tools like Plastigage and dial indicators serve different measurement functions.
Explanation:
Measurement Tools for Crankshaft Journals
To determine the diameter of a crankshaft journal accurately, the most suitable measuring tool is a micrometer. Micrometers are precision instruments designed for measuring very small distances with great accuracy, making them ideal for the intricate measurements required in mechanical engineering.
Here are some reasons why a micrometer is the appropriate choice:
- Precision: Micrometers can measure dimensions to within one thousandth of an inch (0.001 in) or even finer, which is essential in applications like crankshaft journal measurements.
- Specific Use: While a dial caliper can also be used for diameter measurements, it is generally less precise than a micrometer. Micrometers are specifically designed for such small-scale measurements.
- Functionality: Tools like Plastigage are used for checking clearances, and dial indicators measure deviations from a reference point rather than straight diameters.
In summary, for accurately measuring the diameter of a crankshaft journal, a micrometer is the best tool due to its precision and design tailored for small measurements.
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