FEC FUSIONE-HS-2 - Manual (Page 111)

FEC Fusion Operations Manual Chapter 6: Fastening Instructions (Rev. 2)
Page 6-15
• For Angle Control operations, the Torque value may reach a peak value and then drop to a lower
value as the fastener is stretched beyond the point of yielding. Final Torque High and Low Limits are
either set by the engineering specification for that specific fastener, or by determining the acceptable
limits from a study of known good and bad assemblies.
ANGLE CONTROL
REJECT TYPE CAUSES
FINAL TORQUE HIGH LIMIT
Reduced joint compression.
Increased joint friction.
Excessive chatter of the torque signal due to slip stick friction.
Incorrect parameter set-up.
FINAL TORQUE LOW LIMIT
Increased joint compression.
Reduced joint friction.
Excessive yield of fastener.
High initial prevailing torque.
Incorrect parameter set-up.
Reject condition caused by another monitor item reject.
FIG. 6-2-2b Final Torque Monitor – Angle Control
Peak Torque High Limit
Peak Torque Low Limit
Torque
Angle/Time
Final Torque High Limit
Final Torque Low Limit
Snug Torque
Threshold Torque
Speed Change Torque
1 st Torque
Crossover Torque
Final Time 1 st Time
Standard
Angle