This machine is to specially designed to test the strength of l rupture of metal wire an torsion endurance of varnish film of enameled wire, Method is to clamp both ends of specimen tightly. One end is fixed and the other end will be continuously rotated 360°or reciprocally twisted 180°until specimen is fractured or the enameled wire is taken off with the conductor exposed. Afterwards, record the numbers of torsion endurance.