When using outside calipers to compare two shafts, what is the best approach?
Set calipers to one shaft and check the other
Outside calipers have no graduated scale of their own; their spring-set legs simply hold a transferred distance, so they are a comparison and transfer tool rather than a direct-reading instrument.
The correct method is therefore to close the caliper legs onto the first shaft until they just contact its outside diameter, capturing that diameter as a fixed reference setting.
You then offer the same unchanged setting to the second shaft: if it slides on with the identical light drag the diameters match, while any looseness or extra tightness immediately shows which shaft is larger or smaller.
This set-then-check approach gives a reliable direct comparison because the caliper holds one true reference throughout.
Switching to inside calipers is wrong because inside calipers measure bores, not external shaft diameters, so they cannot grip the outside of the shafts at all.
Measuring both shafts at once is impossible with a single transferred setting, and estimating by eye discards the caliper's accuracy entirely, so neither gives a dependable result.
Hence, the answer is Set calipers to one shaft and check the other.
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[Take least count = 0.1 mm]
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Important Questions from Caliper
How many divisions are graduated on the thimble of micrometer?
The least count of Vernier bevel protractor is ____
In a Vernier calliper, 39 main scale divisions are divided into 40 equal points on the Vernier scale. Then what is its least count (LC) in mm? (Take the value of main scale division = 1mm).
Why are calipers generally used along with a steel rule in workshop measurement?
In a vernier caliper, the small scale that slides along the main scale is called:
