GAUGES BY ATTRIBUTES
The result of the checks made by attribute gauges is not a numerical value, but a good/scrap status.
Go - no go fixed gauges are used to check inside and outside smooth diameters, threads, grooves, cones, key ways, chamfers, radii, and so on.
The gauging fixtures are manual measuring stations designed ad hoc for the part to be checked. The fixtures may look like stations inside which the part is carried (the so-called dog houses) or like tools that are seized and then carried onto the part (the so-called layon gages). Once the part is referred on pins, and using the same machine tool references, the holes to be checked are measured either by attributes using pins (functional checks) or by variables using mechanical or electronic master gauges (dimensional and geometric checks.
The masters and master gears are samples used for zero-setting measuring instruments.