Abstract: Described in the article are the operation conditions as required for and the equipment structure of the inlet table kick-in rotary arms of the Φ508 mm PQF pipe mill.The electrical motor power for the arm device is calculated carefully for check.And setting of the positions and the speeds as required for the rotary arm movement process are elaborated.The rotary arm speed must be set up with combination of the three elements，i.e.，first the rotary arm movement time that is calculated based on the rolling cycle，then the electrical motor’s rpm as computed as per the arm rotations，and the operation conditions as well.As for how to accelerate the system to the maximum speed，it must be determined based on the drive spindle’s rotation rate as converted from the variable-frequency motor’s rpm under its rated frequency.