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 sensing how far a contact point is pushed in or out as it spans the bore.
That contact point moves in a straight line and its travel is transferred through the mechanism to the dial indicator.
The dial indicator converts this straight-line (linear) displacement of its plunger into a needle reading on the dial.
It does not measure rotation or thermal expansion/contraction; it responds to linear movement of the contact.
Hence, the answer is Linear movement.
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