METHOD AND DEVICE FOR INSPECTION OF THREADED HOLES Russian patent published in 1995 - IPC

FIELD: measuring equipment. SUBSTANCE: method involves screwing a mandrel with two threaded elements into the hole. Before taking a measurement one of the threaded elements is turned relative to the other one. The mandrel has sectional threaded extension 2 whose end is provided with guide 16 having an end slot. Guide 16 carries additional threaded element 17 with lock 19. The latter is installed on threaded element 17 with a provision for axial movement in order to interact with the end slot on the guide of threaded extension 2. EFFECT: higher productivity and accuracy of inspection. 4 cl, 3 dwg