Disclosed is a measurement device including a first measurement element including a base surface and an upper surface, the upper surface of the first measurement element spaced apart from the base surface of the first measurement element by a first height; and a second measurement element including a base surface and an upper surface, the upper surface of the second measurement element spaced apart from the base surface of the second measurement element by a second height, the second height greater than the first height and the second measurement element attached to the first measurement element. The measurement device can function as a spacer to gauge short distances such as when installing trim around a window or door casement or when installing cabinetry, tile, or siding.

A double ball-bar measuring system includes a calibration unit, at least two double ball-bars and a measuring module. Among the double ball-bars, at least one is a measuring double ball-bar and at least one is a reference double ball-bar. The measuring double ball-bar is installed on a measurement apparatus to measure or calibrate a target machine. The reference double ball-bar is disposed on the calibration unit to measure thermal errors. When the target machine is driven for measurement or calibration, the geometric and thermal errors of the measuring double ball-bar are compensated so that the measurement apparatus can achieve highly accurate measurement.

An apparatus for determining the location of features in a bent element having at least two straight portions and at least one bend between the two straight portions includes a first rail, a second rail, a third rail, a first rotary coupling rotationally coupling the first rail to the second rail and operatively coupling to a first rotary encoder, a second rotary coupling rotationally coupling the second rail to the third rail and operatively coupling to a second rotary encoder, and a linear encoder configured and arranged to determine the location of the second rotary coupling on the second rail.

An apparatus for determining the location of features in a bent element having at least two straight portions and at least one bend between the two straight portions includes a first rail, a second rail, a third rail, a first rotary coupling rotationally coupling the first rail to the second rail and operatively coupling to a first rotary encoder, a second rotary coupling rotationally coupling the second rail to the third rail and operatively coupling to a second rotary encoder, and a linear encoder configured and arranged to determine the location of the second rotary coupling on the second rail.

A brake-shoe tool is for use with a brake-shoe lining. The brake-shoe tool includes an elongated rigid linear shaft assembly and a plurality of rigid flat plate members each rotatably mounted to the elongated rigid linear shaft assembly. Each of the rigid flat plate members includes a flat planar surface in rotating contact arrangement with a neighboring instance of the flat planar surface. A free end extends from the flat planar surface. The free end presents an elongated edge having a unique length. The elongated edge is configured to be positioned adjacent to a thickness of the brake-shoe lining in such a way that each instance of the elongated edge is positionable to and visually comparable against the thickness of the brake-shoe lining.

A brake-shoe tool is for use with a brake-shoe lining. The brake-shoe tool includes an elongated rigid linear shaft assembly and a plurality of rigid flat plate members each rotatably mounted to the elongated rigid linear shaft assembly. Each of the rigid flat plate members includes a flat planar surface in rotating contact arrangement with a neighboring instance of the flat planar surface. A free end extends from the flat planar surface. The free end presents an elongated edge having a unique length. The elongated edge is configured to be positioned adjacent to a thickness of the brake-shoe lining in such a way that each instance of the elongated edge is positionable to and visually comparable against the thickness of the brake-shoe lining.

The present disclosure is an explosive matrix assembly that has a first single detonating cord formed into a first grid, and the first grid has a first plurality of detonating cord portions lying in a first plane and a second plurality of detonating cord portions lying in a second plane and the first plurality of detonating cord portions perpendicularly overlay the second plurality of detonating portions. Additionally, the matrix assembly has a second single detonating cord formed into a second grid, and the second grid has a third plurality of detonating cord portions lying in a third plane and a fourth plurality of detonating cord portions lying in a fourth plane and the third plurality of detonating cord portions perpendicularly overlay the fourth plurality of detonating portions. Further, the matrix assembly has a third single detonating cord formed into a third grid, and the third grid has a fifth plurality of detonating cord portions lying in a fifth plane and a sixth plurality of detonating cord portions lying in a sixth plane and the fifth plurality of detonating cord portions perpendicularly overlay the sixth plurality of detonating portions. The matrix assembly also has a first fastener coupling the first grid perpendicular to the second grid, a second fastener coupling the first grid perpendicular to the third grid, and a third fastener coupling the second grid perpendicular to the third grid thereby forming a partial cube.

A measuring device for measuring nuts, bolt heads, washers and the like that includes a body having a first end, an opposing second end, and a longitudinal reference line extending between the first end and the second end; a first pair of parallel surfaces of equal length, the first pair of opposing parallel surfaces longitudinally between the first end and the second end, the surfaces of the first pair spaced apart by a first distance; a second pair of parallel surfaces of equal length, the second pair of parallel surfaces longitudinally between the first pair of parallel surfaces and the first end, the surfaces of the second pair spaced apart by a second distance that is smaller than the first distance; and a pair of nonparallel surfaces connected at an obtuse angle, the opposing nonparallel surfaces longitudinally between the second pair of opposing parallel surfaces and the first end.

A raised and depressed plate has a base surface, a raised surface, and a depressed surface. A mask processing section is configured to use mask data in which a given region and the remaining region in each of the base surface, the raised surface and the depressed surface are defined as a valid region and an invalid region, respectively, to extract measurement data of the valid regions from measurement data obtained from the sidewall surface of the master disk. A master data generation section is configured to generate master data representing a surface shape of the master disk, by using the measurement data of the valid regions. A user can check measurement accuracy of a shape inspection device by comparing shape values of the raised and depressed plate with the master data.

A raised and depressed plate has a base surface, a raised surface, and a depressed surface. A mask processing section is configured to use mask data in which a given region and the remaining region in each of the base surface, the raised surface and the depressed surface are defined as a valid region and an invalid region, respectively, to extract measurement data of the valid regions from measurement data obtained from the sidewall surface of the master disk. A master data generation section is configured to generate master data representing a surface shape of the master disk, by using the measurement data of the valid regions. A user can check measurement accuracy of a shape inspection device by comparing shape values of the raised and depressed plate with the master data.