Provided is a threaded-hole inspection device having high inspection precision. An incomplete thread ridge portion of a gauge portion 5 of a thread gauge 1 is removed, a phase-positioning portion 8 for positioning a tip-side start point 7 of a complete thread ridge at a prescribed phase when the thread gauge 1 is mounted on a rotating-shaft portion 2 is provided to a fastening portion 6 of the thread gauge 1 that is to be fastened to the rotating-shaft portion 2, and a phase-positioning engaging portion 9 that is to engage with the phase-positioning portion 8 is provided to the rotating-shaft portion 2. A depth of a threaded hole 4 to be inspected is measured on the basis of a number of rotations and thread pitch of a rotating-shaft-feeding mechanism 18 that, via threaded engagement, feeds the rotating-shaft portion 2 in a threaded-hole-approaching direction, which is a direction of approach toward the threaded hole 4, the rotating-shaft portion 2 being caused to rotate by a rotary drive portion 3, and on the basis of a distance over which an outward-moving portion 23 moves outward from the threaded hole, and the depth of the threaded hole 4 is calculated.

A method of quantifying stem nut thread wear in a valve having a valve stem that is positioned with a stem nut. A tool is mounted to, and rotates with, the stem nut, while simultaneously measuring stem displacement. The method of orienting the stem nut threads where one 360 rotation will capture all of the thread backlash in addition to any stem displacement. The measured stem displacement, including stem nut thread backlash, can then be used, with certain stem geometry parameters, to calculate stem nut thread wear percent and quantify remaining stem nut thread material.

A method of quantifying stem nut thread wear in a valve having a valve stem that is positioned with a stem nut. A tool is mounted to, and rotates with, the stem nut, while simultaneously measuring stem displacement. The method of orienting the stem nut threads where one 360 rotation will capture all of the thread backlash in addition to any stem displacement. The measured stem displacement, including stem nut thread backlash, can then be used, with certain stem geometry parameters, to calculate stem nut thread wear percent and quantify remaining stem nut thread material.

Disclosed is a comprehensive thread checking fixture, includes a no-go end, a handle, a measuring column, a measuring sleeve and a jackscrew. The checking fixture not only can be used for detecting the size of the detected threads, but also can be used for detecting the depth of the detected threads, and has the characteristics of simple structure, high detection precision, strong compatibility, low manufacturing cost and the like at the same time.

Disclosed is a comprehensive thread checking fixture, includes a no-go end, a handle, a measuring column, a measuring sleeve and a jackscrew. The checking fixture not only can be used for detecting the size of the detected threads, but also can be used for detecting the depth of the detected threads, and has the characteristics of simple structure, high detection precision, strong compatibility, low manufacturing cost and the like at the same time.

A tool for evaluating a thread depth includes a frame having an elongate portion extending in a first direction; a first contact member coupled to the frame and reciprocable in a second direction between a baseline height and a retracted height, the baseline height being greater than the retracted height. An output device provides an output in response to the height of the first contact member. A reference member is coupled to the frame at a first distance D1 from the first contact member as measured in the first direction; and a second contact member coupled to the frame is disposed at a second distance D2 from the first contact member as measured in the first direction, such that D1 is greater than D2.

A method of verifying torque measurements of a reaction torque transducer of an instrument drive unit includes a controller receiving a verification signal, generating an acceptable range of torques, receiving a torque signal, comparing the torque signal to the acceptable range of torques, and stopping a motor if the torque applied by the motor is outside of the acceptable range of torques. The verification signal is indicative of the current drawn by the motor and the torque signal is indicative of torque applied by the motor.

Provided is a threaded-hole inspection device having high inspection precision. An incomplete thread ridge portion of a gauge portion 5 of a thread gauge 1 is removed, a phase-positioning portion 8 for positioning a tip-side start point 7 of a complete thread ridge at a prescribed phase when the thread gauge 1 is mounted on a rotating-shaft portion 2 is provided to a fastening portion 6 of the thread gauge 1 that is to be fastened to the rotating-shaft portion 2, and a phase-positioning engaging portion 9 that is to engage with the phase-positioning portion 8 is provided to the rotating-shaft portion 2. A depth of a threaded hole 4 to be inspected is measured on the basis of a number of rotations and thread pitch of a rotating-shaft-feeding mechanism 18 that, via threaded engagement, feeds the rotating-shaft portion 2 in a threaded-hole-approaching direction, which is a direction of approach toward the threaded hole 4, the rotating-shaft portion 2 being caused to rotate by a rotary drive portion 3, and on the basis of a distance over which an outward-moving portion 23 moves outward from the threaded hole, and the depth of the threaded hole 4 is calculated.

Provided is a threaded-hole inspection device having high inspection precision. An incomplete thread ridge portion of a gauge portion 5 of a thread gauge 1 is removed, a phase-positioning portion 8 for positioning a tip-side start point 7 of a complete thread ridge at a prescribed phase when the thread gauge 1 is mounted on a rotating-shaft portion 2 is provided to a fastening portion 6 of the thread gauge 1 that is to be fastened to the rotating-shaft portion 2, and a phase-positioning engaging portion 9 that is to engage with the phase-positioning portion 8 is provided to the rotating-shaft portion 2. A depth of a threaded hole 4 to be inspected is measured on the basis of a number of rotations and thread pitch of a rotating-shaft-feeding mechanism 18 that, via threaded engagement, feeds the rotating-shaft portion 2 in a threaded-hole-approaching direction, which is a direction of approach toward the threaded hole 4, the rotating-shaft portion 2 being caused to rotate by a rotary drive portion 3, and on the basis of a distance over which an outward-moving portion 23 moves outward from the threaded hole, and the depth of the threaded hole 4 is calculated.

Disclosed is a comprehensive thread checking fixture, includes a no-go end, a handle, a measuring column, a measuring sleeve and a jackscrew. The checking fixture not only can be used for detecting the size of the detected threads, but also can be used for detecting the depth of the detected threads, and has the characteristics of simple structure, high detection precision, strong compatibility, low manufacturing cost and the like at the same time.