Single or dual redundancy transducer

A power tool, comprising:

• a housing;
• a motor mounted within the housing, the motor including an output pinion;
• a drive train operably coupled to the output pinion of the motor and operable to deliver torque from the output pinion to a spindle of the power tool, the drive train including a ring gear;
• and
• a torque transducer configured to measure the torque delivered to the spindle, the torque transducer including:
• a hub having distal first and second ends,
• a first disk-shaped member having a first outer rim configured to engage the ring gear and a first web extending between the first end of the hub and the first outer rim, and
• a second disk-shaped member having a second outer rim configured to ground the torque transducer to the housing and a second web extending between the second end of the hub and the second outer rim;
• and
• at least one strain gauge assembly coupled to at least one of the first web and the second web, the at least one strain gauge assembly is configured to measure strain in at least one of the first web and the second web and to generate an output signal in response thereto, the output signal configured for use in determining the torque delivered to the spindle of the power tool.

A torque transducer for a power tool having a housing, an output spindle, and a motor mounted in the housing for delivering torque to the output spindle via a drive train having a ring gear, the torque transducer comprising:

• a hub having distal first and second ends;
• a first disk-shaped member having a first outer rim and a first web extending between the first end of the hub and the first outer rim, the first outer rim configured to engage the ring gear of the drive train;
• and
• a second disk-shaped member having a second outer rim and a second web extending between the second end of the hub and the second outer rim, the second outer rim configured to ground the torque transducer to the housing.