Chapter 6 Fastening Operation
PAGE 6-31
●Differential Angle Check
After the end of fastening, the differential angle, which is the difference between the seating point (angle) of
the final torque and the seating point (angle) calculated from rate 2, is measured and judged.
The seating point (angle) calculated from rate 2 is based on the rate 2 start torque (angle) and the rate 2
end torque (angle). (projects the same rate back to zero to determine the seat point)
The differential angle is judged whether or not the calculated differential angle is within ranges based on
the calculated seating point (angle).
•The value of the Differential angle of the fastening curve data and the value of the
differential angle of the fastening result contain a measurement error of a maximum of
5deg (±2.5deg).
•If rate 2 start torque cannot be detected during the fastening operation, the differential angle
check will not be performed.
•Under the following conditions, the torque at the end of fastening is judged as the rate 2 end
torque.
•If the set values are set so Rate 2 start torque > Rate 2 end torque.
•If Rate 2 end torque cannot be detected during the fastening operation.
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