Indicating a Hole on a Mill
Indicating a hole with a dial test indicator, A test indicator measures the deflection of the arm, the probe does not retract but swings in an arc around its hinge point. The lever may be interchanged for length or ball diameter, and permits measurements to be taken in narrow grooves and small bores where the body of a probe type may not reach. These indicators actually measure angular displacement and not linear displacement. If a force is perpendicular to the finger, the linear displacement error is acceptably small within the display range of the dial. However, this error starts to become noticeable when the force is as much as 10 degrees off the ideal 90. Most indicators are bidirectional. Some have a lever to switch read direction and some are automatic. Contact points of higher end test indicators come with a standard carbide sphere at 1, 2, or 3 mm diameter.
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