What kind of movement does the dial indicator detect in a dial bore gauge?
Linear movement
A dial bore gauge measures the diameter of a bore by spanning it with a fixed anvil on one side and a spring-loaded contact point on the other.
As the gauge is rocked through the bore, the contact point is pushed in or out by small amounts as it senses the exact width of the hole.
This in-and-out travel of the contact is a straight-line, or linear, displacement, and it is transferred through the gauge's mechanism to the plunger of the dial indicator.
The dial indicator then converts that linear movement of its plunger into rotation of the needle, showing the reading on the dial.
So the movement the dial indicator actually detects is the linear movement of the contact point.
It does not sense rotational movement, nor does it read thermal expansion or contraction; those are unrelated effects, whereas the plunger responds only to straight-line displacement.
Hence, the answer is Linear movement.
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