With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Daft Punk was founded by two Frenchman.
text_B: The Calo tester , also known as a ball craterer or coating thickness tester , is a quick , simple and inexpensive piece of equipment used to measure the thickness of coatings .. Coatings with thicknesses typically between 0.1 to 50 micrometres , such as Physical Vapor Deposition -LRB- PVD -RRB- coatings or Chemical Vapor Deposition -LRB- CVD -RRB- coatings , are used in many industries to improve the surface properties of tools and components .. Physical Vapor Deposition. Physical vapor deposition. Chemical Vapor Deposition. Chemical vapor deposition. The Calo tester is also used to measure the amount of coating wear after a wear test carried out using a Pin-on-Disc Tester .. wear. wear. Pin-on-Disc Tester. pin on disc tester. The Calo tester consists of a holder for the surface to be tested and a steel sphere of known diameter that is rotated against the surface by a rotating shaft connected to a motor whilst diamond paste is applied to the contact area .. steel. steel. sphere. sphere. diameter. diameter. diamond. diamond. The sphere is rotated for a short period of time -LRB- less than 20 seconds for a 0.1 to 5 micrometre thickness -RRB- but due to the abrasive nature of the diamond paste this is sufficient time to wear a crater through thin coatings .. micrometre. micrometre. wear. wear. sphere. sphere. diamond. diamond. abrasive. abrasive
not_related.