FEC AFC1100 - Manual (Page 7)

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6.2.3 Point-to-Point Torque Rate Monitoring
The AFC1100 System is capable of performing two independent torque rate calculations.
This method performs the calculation based upon completing a step of the process, and then
calculating the rate for the full duration of that step. Each Torque Rate is calculated by
dividing the change in torque during the specific period by the change in angle.
Example:
FASTENING END CROSSOVER TORQUE 2ND TORQUE RATE
1st TORQUE/ANGLE THRESHOLD 1 1ST TORQUE RATE
STOP POINT START POINT STAGE
For all control operations, the High and Low Torque Rate limits are set by determining the
acceptable limits from a study of known good and bad assemblies.
Chapter 6: Fastening Instructions (Rev. 1/98)
Page 6-7