Servo motor 90 causes mandrel 32 to rotate about axis 29 to a desired angular position, at which the helical die teeth 46 on the external surface of mandrel 32 first contact the gear blank workpiece 58.
The rectilinear displacement of the actuator stem is converted into a rotational displacement of the lever 120, whereby the lever 120 imparts a rotational force or torque to the valve shaft 132 via the collet 122 to rotate the closure member 128 to a desired angular position to vary or control the flow flowing through the rotary valve 104.
When the mandrel 32 is in its desired angular position, hydraulic press 14 is actuated to continue its axial translation and servo motor 90 is actuated to rotate at a speed that is related to the speed of its axial translation such that the internal gear teeth are formed on the workpiece 58 with the desired helix angle.
In this manner, by suppressing the imbalance of the weight of the rotor 2 (the moment around the center axis of the rotor 2) during the attaching of the blade 2A to the hub 2B using the dummy blades 100L, the rotor 2 can be rotated to the desired angular position with low torque.
Once the desired angular position has thus been reached, the cyclist interrupts the thrust on the lever 131 and leaves it.
一旦已经因此达到所期角位置,骑车者便中断在操纵杆131上推进并且离开操纵杆131。
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