FEC AFC1500 User Manual
Page 91
FEC AFC1500 Operations Manual
Chapter 6: Fastening Instructions (Rev. 6: 10/09)
Page 6-5
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Three-Step Fastening
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Three-step fastening will be used primarily for joints that have a requirement to synchronize with
another spindle during the incremental stages of the rundown to crush/compress a gasket or grom-
met or for special joint conditioning (valve cover, oil pan, or body assembly, for example).
1. The system will fasten to the 1ST TORQUE value during the specified 1ST TIME. 1ST
TORQUE must be reached within the 1ST TIME limits or a reject will occur.
2. Once SPEED CHANGE TORQUE is reached or FREERUN REVOLUTIONS expires, the sys-
tem will switch from FREERUN SPEED to SLOWDOWN SPEED and continue to fasten to
1ST TORQUE.
3. Upon reaching 1ST TORQUE, 1ST TIME ends and FINAL TIME begins. 1ST TORQUE is
the shift point to TORQUE SPEED and the synchronization point prior to commencing the
next step. (See 4.7.6 for Standalone Sync. info)
4. The system will fasten to CROSSOVER TORQUE, synchronize with other spindles and then
fasten to STANDARD TORQUE using TORQUE SPEED during FINAL TIME. STANDARD
TORQUE must be reached within the FINAL TIME limits or a reject will occur.
FUNCTION
RECOMMENDATION / COMMENT
SPEED CHANGE TORQUE
10% of STANDARD TORQUE
THRESHOLD TORQUE
Start point of 1
st
torque rate monitoring (section 6.2)
1ST TORQUE
30% of STANDARD TORQUE
Used for RATE/TIME settings and TORQUE SPEED initiation.
Synchronization point for 2nd STEP
SNUG TORQUE
Angle Monitoring Start Point (section 6.2)
CROSSOVER TORQUE
Start point of 3
RD
torque rate monitoring (section 6.2)
Synchronization point for 3rd STEP
STANDARD TORQUE
Engineered product fastening specification
1ST TIME HIGH/LOW LIMIT
Acceptance range to reach 1ST TORQUE setting
FINAL TIME HIGH/LOW LIMIT
Acceptance range to go from 1ST TORQUE to STANDARD
TORQUE
FIG. 6-1-1c Torque Control Functions for Three-Step Fastening
Standard Torque
Threshold Torque
Speed Change Torque
1
st
Torque
Crossover Torque
1
st
Time
Final Time
Snug Torque
Torque
Angle/Time