EN Power Focus 600
24
© Atlas Copco Industrial Technique AB - 9836 4954 01
Selftap
The Selftap step enables tightening where the rundown torque required is
greater than the Rundown complete torque, for example when tightening thin
layers of metal using self-threading (or self-tapping) bolts.
Parameter Description Default value
Selftap Activates the Selftap step. Off
Length Defines the angle to turn the socket
during Selftap. Measured from the
end of the Start stage.
360°
Speed Defines the speed during Selftap.
Speed Defines the speed during selftap.
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{ , : noprofile in element [p]}Soft
start speed or 5% of Tool-
MaxSpeed
Torque min Torque value for lower Selftap
limit.
0 Nm
Torque max Torque value for upper Selftap
limit.
Tool max torque
Rundown torque limits
The friction between the nut and joint can vary. This can cause the torque
needed to run a nut down a thread, before engagement with the joint surface
takes place, to vary as well. These effects could be, for example, hole interfer-
ence, prevailing torque or varying lubrication.
Monitoring the rundown torque can be useful when running down a lock nut
which has a plastic insert in the threads to help the fastener resist vibration. This
will require a higher torque, known as prevailing torque, to overcome the inter-
ference.
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