LO 5-3 Identify and describe common instruments and techniques to make linear precision measurements

LO 5-03: Identify and describe common instruments and techniques to make linear precision measurements

Telescoping Gauges

Telescoping gauges are linear measuring devices that can measure holes or internal diameters. These devices are used with micrometers, which make the final numerical measurement. The head of a T-shaped telescoping gauge is spring loaded and locked by its handle to hold it in its most compact position. When unlocked with finger force, spring force expands the heads across the hole. The gauge is rocked slightly while slowly tightening the handle to ensure that the maximum dimension is obtained. Once the measurement is made, the gauge locks and the dimension is transferred for measurement by a micrometer with the correct range. Telescoping gauges can also be set and locked to a specific size inside an external micrometer or other gauge to validate whether a hole or internal diameter has the correct dimensions. Telescoping gauges vary in size, with a set often packaged together measuring from an inch to 6" in diameter FIGURE 21.

FIGURE 05-21: The handle of the telescoping gauge is slowly rocked while tightening the handle on the lock. The dimension measured by the gauge is recorded by a micrometer.

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