A roll testing machine for roll testing toothings includes a first spindle and a second spindle, and a first master wheel, which is arranged on the first spindle. The roll testing machine allows for a more efficient testing of a shaft having two gearings by using a second master wheel, which is arranged on the first spindle.

Devices and methods for measuring roller chain wear are provided. A roller chain wear gauge may include an elongated structure configured to be inserted into a gap between two roller links of a chain joined by a pin link of the chain, the chain having an associated chain size. The elongated structure may include a first side surface, a second side surface, a length extending along a longitudinal axis of the elongated structure, and a plurality of widths located along the length and defined by and between the first and second side surfaces. The first side surface may extend at an angle relative to the longitudinal axis such that the plurality of widths continuously tapers over the length. The plurality of widths may be calibrated against a reference chain representative of the associated chain size.

Devices and methods for measuring roller chain wear are provided. A roller chain wear gauge may include an elongated structure configured to be inserted into a gap between two roller links of a chain joined by a pin link of the chain, the chain having an associated chain size. The elongated structure may include a first side surface, a second side surface, a length extending along a longitudinal axis of the elongated structure, and a plurality of widths located along the length and defined by and between the first and second side surfaces. The first side surface may extend at an angle relative to the longitudinal axis such that the plurality of widths continuously tapers over the length. The plurality of widths may be calibrated against a reference chain representative of the associated chain size.

A method and apparatus for measuring stem nut wear in a valve having a threaded valve stem that is positioned to engage the threads of a stem nut. In a preferred embodiment, a tool is mounted on the stem nut, wherein the tool rotates when the stem nut rotates. The tool indicates a measurement of stem nut rotation. An indicator indicates stem movement. The stem nut is rotated and the amount of percent wear is observed. Rotation continues until the stem begins to move. The tool provides a reading when the stem begins to move that indicates an amount of stem nut wear.

A guide aligns electrical devices such as switches and outlets that are mounted in a longitudinal row within a multiple gang electrical box prior to mounting a faceplate on the electrical box in which the faceplate includes a row of apertures receiving face portions of the electrical devices respectively therein. The guide has a main body and at least one guide finger protruding from the main body transversely to a longitudinal direction of the main body towards a free distal end of the guide finger. The guide finger(s) have guide surfaces extending parallel to one another at opposing sides of the guide finger, spaced at a prescribed distance equal to an aperture distance between the apertures in the faceplate. The fingers can be inserted between electrical devices to align the devices relative to the box before mounting the faceplate.

A guide aligns electrical devices such as switches and outlets that are mounted in a longitudinal row within a multiple gang electrical box prior to mounting a faceplate on the electrical box in which the faceplate includes a row of apertures receiving face portions of the electrical devices respectively therein. The guide has a main body and at least one guide finger protruding from the main body transversely to a longitudinal direction of the main body towards a free distal end of the guide finger. The guide finger(s) have guide surfaces extending parallel to one another at opposing sides of the guide finger, spaced at a prescribed distance equal to an aperture distance between the apertures in the faceplate. The fingers can be inserted between electrical devices to align the devices relative to the box before mounting the faceplate.

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 device for identifying bolts and nuts can include a plurality of threaded bodies, wherein each threaded body of the plurality of threaded bodies includes: a female threaded portion; and a male threaded portion, the male threaded portion being connected to the female threaded portion; wherein the female threaded portion and the male threaded portion extend in opposite directions; a flexible connector including a plurality of flexible portions that connect the plurality of threaded bodies; wherein each flexible portion of the plurality of flexible portions has a height, a width and a length, the length being larger than the width, and the height being larger than the width so that the flexible connector is more flexible along a first plane than a second plane perpendicular to the first plane.