The post-process measurement can be used to high production run of smaller parts. The inspection process can be made by traditional methods. If the dimensions are not within the given tolerance zone, a correction can be made to the next part through the machine tool. Block Gauge Gauge blocks are individual square, rectangular, or round metal blocks of various sizes. Their surfaces are lapped and are flat and parallel within a range of 1-5 micro inch.
Gage blocks are available in sets of various sizes.
The blocks can be assembled in many combinations to obtain desired lengths. The gage block assemblies are used as an accurate reference length to measure the part's length. The micrometer is commonly used for measuring the thickness and inside or outside diameters of parts. Micrometers are also available for measuring depths. Micrometers can be equipped with digital readout to reduce errors in reading.