Chapter 6 Description of Operations
PAGE 6-34
Fastening Speed and Time
With the HFC3000 Nutrunner System, the speed can be set according to the fastening operation.
1. Within the set 1st time high limit value, fastening up to the 1st torque or the 1st angle is performed. Also
within the 1st time, the following fastening operations are executed.
1-1. Within the time set as the initial time, operation at the initial speed is performed.
The initial time is set to alleviate the shock at the start of fastening and to enable fitting of the bolt and
the socket, etc.
1-2. After the end of the initial time, rotation at the freerun speed is performed up to the number of
revolutions set as the freerun revolutions. However, if rotation has already been performed for the
number of revolutions set as the freerun revolutions during the initial time, the speed is changed from
the initial speed to the 1st speed.
1-3. When the ramp down start torque is detected or rotation corresponding to the freerun revolutions has
been performed, the speed is changed from the freerun speed to the 1st speed. The operation is
continued until the 1st torque or the 1st angle is detected or the 1st time high limit value is reached.
The 1st speed is set so that the speed changes to it immediately before the bolt is seated to enable
seating to be attained without applying an excessive load to the tool.
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