Shi measuring Shi, test machine provides bone nail a axis to vertical load 5 pounds, same time test machine drive fake bone do, speed rotating about 9 RPM, into test until bone nail lock to last a teeth, course if occurred fracture or over 2 minutes also cannot turned into fake bone is canceled test; during records into Shi of torque value, draws into torque-circle number relationship figure, and take Qian seven circle of maximum torque value as maximum torque
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