A speed square consisting of a three sided isosceles triangle that is used in the construction industry as well as the do-it-yourselfer. Consisting of a lead side of a 90 degree angle, a hypotenuse side with a scale of angular degrees ranging from 5 degrees to 90 degrees. The third side and most important side has a scale of inches divided into increments of , but furthermore and most importantly the third side has a raised edge of that when utilized to be used as a safety guide in the act of cutting a straight line. This also acts as a barrier when using such instruments as a utility knife, thus reducing the risk of injury to the hand or fingerers.

An arrow shaft test apparatus, includes: a measuring machine body disposed lengthily in the left and right directions; a pair of arrow seating parts provided on the upper end of the measuring machine body, and disposed to be spaced at a predetermined distance apart from each other in the left and right directions; and a measuring sensor unit fixed to the measuring machine body, and for measuring the spacing distance forming with any outer circumferential surface of a shaft seated in the pair of arrow seating parts.

Apparatuses, systems and methods associated with a metrology system for high-speed, non-contact coordinate measurements of parts are disclosed herein. In embodiments, the metrology system includes a metrology bridge to be coupled to a measurement assembly. The measurement assembly may include a stage moveable across multiple independent axes. The bridge may include a housing, mounting members coupled to the housing, and a plurality of sensors mounted within the housing. The mounting members may rotatably couple the housing to the measurement assembly. Further, sensor elements of the plurality of sensor devices may be aligned along a length of the housing and may be directed out of the housing.

A method for the mechanical correction of geometric motion errors of a positioning machine having at least two machine frame components and at least one axis movement assembly for the relative movement of the machine frame components, the at least one axis movement assembly comprising a plurality of axis guide components, each axis guide component and each machine frame component having a mounting surface. A mounting surface correction profile is determined for the considered axis, whereas the mounting surface correction profile describes the correction amounts in function of the position for the mechanical correction of the considered axis. The determined mounting surface correction profile is imparted to the mounting surface of the axis guide component or to the mounting surface of the machine frame component of the considered axis by machining.

A metrological instrument configured to measure diameters comprises one or more guide rails, a plurality of clamping blocks configured to removably or releaslably securely locate the blocks on the one or more guide rails, and also configured to removably or releaslably securely clamp a measurement arm substantially normal to the one or more guide rails. A displacement transducer, such as a dial indicator or a digital indicator, may be disposed at an end of one or more of the measurement arms for determining a displacement, relative or absolute, between the measurement arms. To provide the required measurement accuracy, precision, and repeatability, the instrument may be configured with carbon fiber reinforced composite guide rails, and/or measurement arms.

A three-dimensional coordinate measurement apparatus capable of reducing shaking of a Y carriage and improving measurement accuracy. The Y carriage is supported by two strut members which are across a surface plate and movable in a Y-axis direction. The two strut members include a first strut member having a driving mechanism and a second strut member which moves following the first strut member. A guide portion parallel to the Y-axis direction is formed in the surface plate on a first strut member side. Side surface support members support the first strut member on the surface plate by holding both opposed side surfaces of the guide portion. The driving mechanism includes a roller having an axis perpendicular to a surface plate surface, and the roller is brought into contact with one side surface of the guide portion and rolled to move the Y carriage relatively to the surface plate.

Jigs and fixtures for aligning, guiding, and/or holding a workpiece on woodworking machinery during a woodworking operation are described, as well as methods of making, modifying, and using jigs and fixtures.

A three-dimensional coordinate measurement apparatus capable of reducing shaking of a Y carriage and improving measurement accuracy. The Y carriage is supported by two strut members which are across a surface plate and movable in a Y-axis direction. The two strut members include a first strut member having a driving mechanism and a second strut member which moves following the first strut member. A guide portion parallel to the Y-axis direction is formed in the surface plate on a first strut member side. Side surface support members support the first strut member on the surface plate by holding both opposed side surfaces of the guide portion. The driving mechanism includes a roller having an axis perpendicular to a surface plate surface, and the roller is brought into contact with one side surface of the guide portion and rolled to move the Y carriage relatively to the surface plate.

A step gauge and a reference gauge block are placed in a temperature-controlled chamber in parallel with each other. A temperature of the step gauge is changed to a first temperature and a second temperature using a measurement-target temperature adjuster and the temperature-controlled chamber. A distance between a first surface and a second surface of the step gauge is relatively measured at each of the first and second temperatures with reference to a distance between a first reference surface and a second reference surface of the reference gauge block. A coefficient of thermal expansion of the measurement target is calculated from the length of the measurement target at the first temperature and the length of the measurement target at the second temperature.

A support system of a slender article in a geometry-detecting machine includes a plurality of vertical constraint points with which the slender article is in contact, wherein the vertical constraint points are coupled in pairs by interconnection arms in turn including a constraint joint provided with a universal joint mechanism which leaves, to the arms, two rotational degrees of freedom along two orthogonal axes passing in the proximity of the longitudinal axis of the article, the constraint joints possibly being themselves similarly coupled in pairs until converging, in a multiple-layer sequence, towards a single constraint point.