Patent ID: 8235144

Claim:
A tool comprising a tool body, at least one radially extendable cutter block, each of the at least one cutter block radially movable from a retracted position substantially within the tool body to an extended position radially outward of the tool body, the tool attached to and rotatable by a drilling support to underream, and a position sensor comprising a strip and a sensor to measure a position of the at least one cutter block relative to the tool body, the tool further comprising: the at least one radially extendable cutter block supporting one of the strip and the sensor, and the tool body supporting the other of the strip and the sensor to measure the position of the at least one cutter block relative to the tool body, a vibration sensor to measure vibration of the tool, and the position sensor and the vibration sensor being in communication with a microprocessor to optimize drilling dynamics by comparing position sensor data and vibration signal data.