A dial gauge (also commonly known as a dial indicator or mechanical comparator) is a precision engineering instrument used to measure tiny linear distances, surface flatnesses, or mechanical deviations that are invisible to the human eye. ⚙️ How It Works
The fundamental operating principle of a dial gauge relies on mechanical amplification:
Contact: A spring-loaded plunger or probe is pressed against the surface of a workpiece.
Translation: When the surface varies, the plunger moves up or down.
Amplification: This small linear movement drives an internal rack-and-pinion gear train.
Display: The gears amplify the motion, translating it into the rotation of a large needle across a graduated clock-like dial face. 📏 Common Variations & Resolution
Standard mechanical dial gauges usually offer a measurement resolution (least count) of 0.01 mm (metric) or 0.001 inches (imperial). High-precision variants can read down to 0.001 mm. They are generally split into three main styles:
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