•
The hole thread is dierent from the screw thread
•
The hole thread is not clean (for instance by deburrs from CNC machining)
•
The friction between the screw thread and the hole thread is too low or too high
•
The friction between the screw head and the tighten part is too low or too high
A torque gradient variable is made available to be checked in the robot program.
The graph below shows a normal Torque/Angle curve. In this case has been made with a M4
screw and 2.4 Nm as target torque.
Torque angle curve Metric
Torque angle curve US Standard
HARDWARE SPECIFICATION
202
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