A method of operating a measurement device to check an internal thread of a spark plug bore for proper orientation of a spark plug includes positioning a cylinder head relative to the measurement device and measuring a seat surface z-position. The seat surface is configured to seat the spark plug within the spark plug bore. The method includes measuring at least one set of coordinates. Each set of coordinates is at a major diameter of a corresponding threadform of the internal thread. The method includes determining a pitch of the internal thread. The method includes calculating a thread start location where the major diameter of the internal thread intersects the seat surface based on the coordinates of the at least one set of coordinates, the pitch of the internal thread, and the z position of the seat surface. The method includes comparing the thread start location to a reference location.

A screw thread measurement system and methods may comprise a frame having a reference surface, a carrier coupled to the frame and configured to translate relative to the frame, a dimension measurement system coupled to the carrier and having a thread contact element configured to translate relative to the frame and orthogonally the translation axis of the carrier. The dimension measurement system configured to determine thread dimensions relative to the frame reference surface.

A distance sensor (1) for estimating a distance to a surface (OS) of an object (O), the distance sensor including a micro electric mechanical system (MEMS) (5), a detection means (30) and a processing device (40). The MEMS comprises a MEMS device (10) having a surface (12), denoted as MEMS sensor surface, to be arranged opposite the surface (OS) of said object (O) and a MEMS driver (20) for generating an ac driving signal to cause the MEMS sensor surface (12) to vibrate. The detection means (30) is to determine a value of a property of a dynamic behavior of the MEMS (5) and the processing device (40) is to estimate an average distance (h) as a measured distance (D2) between the MEMS sensor surface (12) and the surface (Os) of the object (O) based on the determined value for said property.

A distance sensor (1) for estimating a distance to a surface (OS) of an object (O), the distance sensor including a micro electric mechanical system (MEMS) (5), a detection means (30) and a processing device (40). The MEMS comprises a MEMS device (10) having a surface (12), denoted as MEMS sensor surface, to be arranged opposite the surface (OS) of said object (O) and a MEMS driver (20) for generating an ac driving signal to cause the MEMS sensor surface (12) to vibrate. The detection means (30) is to determine a value of a property of a dynamic behavior of the MEMS (5) and the processing device (40) is to estimate an average distance (h) as a measured distance (D2) between the MEMS sensor surface (12) and the surface (Os) of the object (O) based on the determined value for said property.

A gear measurement method and a gear measurement apparatus capable of evaluating meshing and fitting of a gear are provided. A measurement method for a gear includes a measurement step of measuring an actual movement locus of a ball that is moved along a tooth groove of the gear as a shape evaluation index for the gear. In the case of a VGR rack, tooth surfaces of rack teeth are constituted of curved surfaces. Thus, a reference pin for use in OPD cannot be disposed so as to be in line contact with the tooth surfaces, and the rack teeth cannot be measured. However, the ball can be disposed so as to be in point contact with the tooth surfaces, which enables a measurement of the rack teeth.

A clearance gage that includes an elongated shaft having a first end and a second end, a gage element connected to the first end of the elongated shaft, where the gage element defines a first width and a second width measured perpendicular to the elongated shaft, where the first width is larger than the second width, where a thickness of the elongated shaft is not more than the second width, where the first width defines a size of the gage element to assess a gap clearance between two components, and a marker connected to the elongated shaft, where the marker is positioned at a predetermined distance from the gage element along the elongated shaft, where the marker defines a marker width measured in a direction perpendicular to the elongated shaft that is greater than the second width of the gage element.

A clearance gage that includes an elongated shaft having a first end and a second end, a gage element connected to the first end of the elongated shaft, where the gage element defines a first width and a second width measured perpendicular to the elongated shaft, where the first width is larger than the second width, where a thickness of the elongated shaft is not more than the second width, where the first width defines a size of the gage element to assess a gap clearance between two components, and a marker connected to the elongated shaft, where the marker is positioned at a predetermined distance from the gage element along the elongated shaft, where the marker defines a marker width measured in a direction perpendicular to the elongated shaft that is greater than the second width of the gage element.

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.

The present invention discloses a synchronization method for multi-station data of dynamic coordinate measurement by a workshop measuring and positioning network. The method comprises the following steps of: determining a measuring and positioning space according to the in-situ measurement dimension, selecting locations for placing several transmitters, calibrating external parameters of the transmitters by a reference ruler, and establishing a measurement field; in a communication data packet of a signal processor, attaching local clock information into the angle information of each transmitter; and setting fixed time nodes on a time axis, and synchronizing data of different transmitters to corresponding time nodes so as to realize data synchronization. The present invention improves the conventional static measurement function of the wMPS to a certain dynamic measurement function for expanding the application ranges of the wMPS, and provides a technical support for realization of real-time, high-accuracy and large-scale in-situ industrial coordinate measurement based on wMPS.

The present invention discloses a synchronization method for multi-station data of dynamic coordinate measurement by a workshop measuring and positioning network. The method comprises the following steps of: determining a measuring and positioning space according to the in-situ measurement dimension, selecting locations for placing several transmitters, calibrating external parameters of the transmitters by a reference ruler, and establishing a measurement field; in a communication data packet of a signal processor, attaching local clock information into the angle information of each transmitter; and setting fixed time nodes on a time axis, and synchronizing data of different transmitters to corresponding time nodes so as to realize data synchronization. The present invention improves the conventional static measurement function of the wMPS to a certain dynamic measurement function for expanding the application ranges of the wMPS, and provides a technical support for realization of real-time, high-accuracy and large-scale in-situ industrial coordinate measurement based on wMPS.