Måttblock

Måttblock, also known as gauge blocks or Jo blocks, are precision surface plates with a specific, highly accurate length. They are used as reference standards in metrology and manufacturing to calibrate measuring tools and instruments, and for setting and inspecting dimensions. Måttblock are typically made from hardened steel or ceramic materials to ensure stability and wear resistance. They are manufactured to extremely tight tolerances, often in the micrometer or sub-micrometer range.

The primary function of måttblock is to provide a known, verifiable length. By combining different måttblock in a precise stack, a wide range of exact dimensions can be created. This process, called "wringing," involves bringing two lapped surfaces into contact with just enough pressure to create a thin film of oil or air, effectively bonding them together through molecular adhesion. This allows for the creation of custom gauges for specific inspection tasks.

Måttblock are crucial for maintaining accuracy in precision machining and quality control. They are used to set calipers, micrometers, and other measuring devices, as well as for checking the accuracy of manufactured parts. The accuracy of måttblock is maintained through careful handling, storage in controlled environments, and periodic calibration. Their role as fundamental standards makes them indispensable tools in industries where dimensional precision is paramount, such as aerospace, automotive, and manufacturing.