A positioning mechanism for a man-made ear includes a shaft, a driving device, a rotational arm, a first sliding member, and a second sliding member. The driving device is slidably secured to the shaft by a first fastener. The driving device also has a rotational wheel. The rotational arm has an end secured to the rotational wheel. The first sliding member has a first elongated sliding groove adjustably secured to the rotational arm by a second fastener inserted through the first elongated sliding groove. The second sliding member has one or more second elongated sliding grooves perpendicular to the first elongated sliding groove. The second sliding member is adjustably secured to the first sliding member by one or more third fasteners inserted through the one or more second elongated sliding grooves. The second sliding member is configured for securing a man-made ear.